@charset "UTF-8";

@import url("./ipad.css?v=20260920-ipad1");

:root {
  --bg: #fbfcff;
  --surface: #ffffff;
  --ink: #0f1645;
  --muted: #596386;
  --soft: #f5f7ff;
  --line: #e1e6f5;
  --blue: #496ff4;
  --blue-soft: #eef3ff;
  --green: #26a96c;
  --green-soft: #e6f8ef;
  --orange: #ff6b2c;
  --orange-soft: #fff0e8;
  --purple: #592be7;
  --purple-dark: #35128a;
  --purple-soft: #f0eaff;

  /* Unit theme colors (student-v2.3 shared palette) */
  --unit-all: #9aa0a6;
  --unit-all-soft: #f3f4f6;
  --unit-u1: #3b82f6;
  --unit-u1-soft: #eff6ff;
  --unit-u2: #12b981;
  --unit-u2-soft: #ecfdf5;
  --unit-u3: #d39a2f;
  --unit-u3-soft: #fbf6eb;
  --unit-u4: #e05252;
  --unit-u4-soft: #fdf2f2;
  --unit-u5: #8b5cf6;
  --unit-u5-soft: #f5f3ff;
  --unit-u6: var(--unit-u3);
  --unit-u6-soft: var(--unit-u3-soft);

  --shadow: 0 20px 46px rgba(39, 47, 109, 0.12);
  --soft-shadow: 0 12px 28px rgba(39, 47, 109, 0.08);
  --radius: 8px;
  --main-width: 1290px;
  --shell-gutter: clamp(16px, 4.2vw, 48px);
  --page-pad-top: clamp(28px, 3.6vw, 48px);
  --page-pad-bottom: clamp(40px, 5vw, 64px);
  --section-gap: clamp(20px, 2.8vw, 36px);
  --panel-pad: clamp(18px, 2.4vw, 32px);
  --font-body: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 74% 26%, rgba(89, 43, 231, 0.08), transparent 34%),
    linear-gradient(180deg, #ffffff 0, #fbfcff 44%, #f8faff 100%);
  color: var(--ink);
  font-family: var(--font-body);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid #eef1fa;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 8px 28px rgba(35, 42, 91, 0.05);
  backdrop-filter: blur(12px);
}

.topbar,
.page-shell {
  width: min(calc(100% - (var(--shell-gutter) * 2)), var(--main-width));
  margin: 0 auto;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: clamp(64px, 8vw, 86px);
}

.brand-mark,
.topbar-actions {
  display: flex;
  align-items: center;
}

.brand-mark {
  gap: 14px;
  color: var(--ink);
  font-size: 24px;
  font-weight: 850;
}

.brand-symbol {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--purple), var(--purple-dark));
  color: #fff;
  box-shadow: 0 12px 22px rgba(53, 18, 138, 0.26);
}

/* Keep right actions in the original third column after removing center nav. */
.nav-links {
  display: none !important;
}

.topbar-actions {
  grid-column: 3;
  justify-self: end;
  justify-content: flex-end;
  gap: 16px;
}

.topbar-actions.is-login-trigger {
  cursor: pointer;
}

.session-pill {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 14px;
  background: rgba(250, 251, 255, 0.92);
  color: var(--muted);
  font-size: 15px;
}

.session-icon {
  position: relative;
  display: inline-block;
  width: 23px;
  height: 23px;
  border-radius: 50%;
  background: #e8ecf8;
}

.session-icon::before,
.session-icon::after {
  position: absolute;
  left: 50%;
  background: #8d96b4;
  content: "";
  transform: translateX(-50%);
}

.session-icon::before {
  top: 5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.session-icon::after {
  bottom: 4px;
  width: 14px;
  height: 7px;
  border-radius: 8px 8px 4px 4px;
}

.ghost-btn,
.primary-btn,
.secondary-btn {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  border-radius: 7px;
  padding: 0 36px;
  font-weight: 800;
}

.ghost-btn {
  min-height: 40px;
  border: 1px solid #bfc7e6;
  background: #fff;
  color: var(--ink);
}

.topbar-actions .ghost-btn {
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(250, 251, 255, 0.92);
  padding: 7px 14px;
  color: var(--ink);
  font-size: 15px;
}

.primary-btn {
  gap: 28px;
  min-width: 174px;
  background: linear-gradient(135deg, var(--purple), var(--purple-dark));
  color: #fff;
  box-shadow: 0 16px 30px rgba(67, 25, 169, 0.25);
}

.primary-btn span {
  font-size: 30px;
  line-height: 1;
}

.secondary-btn {
  min-width: 188px;
  border: 1px solid #8f78ec;
  background: #fff;
  color: var(--purple);
}

.page-shell {
  padding: var(--page-pad-top) 0 var(--page-pad-bottom);
}

.task-created-banner {
  margin: 0 0 var(--section-gap);
  border: 1px solid #c9d4ff;
  border-radius: var(--radius);
  background: var(--blue-soft);
  padding: 16px 20px;
  color: var(--ink);
}

.task-created-banner p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
}

.task-created-banner p + p {
  margin-top: 6px;
  color: var(--muted);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
  gap: clamp(16px, 2.8vw, 34px);
  min-height: clamp(320px, 42vw, 438px);
  margin-bottom: var(--section-gap);
}

.hero-copy {
  max-width: 560px;
}

.eyebrow {
  margin: 0 0 20px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 520px;
  margin-bottom: 22px;
  color: var(--ink);
  font-size: clamp(36px, 4.8vw, 70px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 9px;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.25;
  font-weight: 850;
}

.hero-subtitle {
  max-width: 560px;
  margin-bottom: 34px;
  color: var(--muted);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(12px, 2vw, 22px);
}

.hero-visual {
  position: relative;
  min-height: clamp(300px, 42vw, 428px);
}

.window-frame {
  position: absolute;
  top: 0;
  left: 252px;
  width: 300px;
  height: 250px;
  border: 12px solid rgba(226, 231, 248, 0.82);
  background:
    linear-gradient(135deg, rgba(231, 235, 250, 0.75) 0 18%, transparent 18% 31%, rgba(231, 235, 250, 0.75) 31% 38%, transparent 38%),
    rgba(255, 255, 255, 0.46);
  opacity: 0.8;
}

.window-frame::before {
  position: absolute;
  left: -12px;
  right: -12px;
  top: 122px;
  height: 12px;
  background: rgba(226, 231, 248, 0.82);
  content: "";
}

.window-frame::after {
  position: absolute;
  top: -12px;
  bottom: -12px;
  left: 50%;
  width: 12px;
  background: rgba(226, 231, 248, 0.82);
  content: "";
}

.clock-face {
  position: absolute;
  top: 18px;
  right: 12px;
  width: 104px;
  height: 104px;
  border: 5px solid #d9def1;
  border-radius: 50%;
  background: radial-gradient(circle, #fff 0 58%, #f8f9ff 59% 100%);
  box-shadow: inset 0 0 0 1px rgba(195, 202, 224, 0.35);
}

.clock-hand {
  position: absolute;
  left: 50%;
  bottom: 50%;
  transform-origin: bottom center;
  border-radius: 999px;
  will-change: transform;
}

.clock-hand-hour {
  width: 4px;
  height: 28px;
  margin-left: -2px;
  background: #9aa3c0;
}

.clock-hand-minute {
  width: 3px;
  height: 38px;
  margin-left: -1.5px;
  background: #b4bbd4;
}

.clock-hand-second {
  width: 2px;
  height: 42px;
  margin-left: -1px;
  background: #d98b6a;
}

.clock-center {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  margin: -4px 0 0 -4px;
  border-radius: 50%;
  background: #c3cae0;
  box-shadow: 0 0 0 2px #fff;
}

.study-card {
  position: absolute;
  z-index: 3;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.study-card.question-card {
  top: 12px;
  left: 164px;
  width: 250px;
  padding: 22px 22px 16px;
}

.card-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 19px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.card-topline strong {
  color: var(--ink);
  font-size: 17px;
}

.question-lines {
  display: grid;
  gap: 8px;
}

.question-lines span {
  display: block;
  height: 6px;
  border-radius: 999px;
  background: #e5e8ff;
}

.question-lines span:nth-child(2) {
  width: 66%;
  background: #eee0f3;
}

.question-lines span:nth-child(3) {
  width: 52%;
  background: #ffe7dc;
}

.formula-chip {
  width: max-content;
  margin-top: 20px;
  border-radius: 999px;
  padding: 8px 13px;
  background: #def8eb;
  color: #1c9b61;
  font-size: 15px;
  font-weight: 900;
}

.progress-card {
  right: 8px;
  top: 292px;
  z-index: 6;
  width: 164px;
  padding: 21px 18px 18px;
}

.mini-label {
  display: block;
  margin-bottom: 12px;
  color: var(--orange);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.progress-card strong {
  display: block;
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 20px;
}

.progress-bar {
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7e5ff;
}

.progress-bar span {
  display: block;
  width: 72%;
  height: 100%;
  border-radius: inherit;
  background: var(--purple);
}

.study-figure {
  position: absolute;
  z-index: 5;
  left: 165px;
  bottom: -8px;
  width: 500px;
  height: 500px;
}

.study-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

@keyframes unit-hero-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes unit-hero-slide-in-left {
  from {
    opacity: 0;
    transform: translateX(-36px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes unit-hero-slide-in-right {
  from {
    opacity: 0;
    transform: translateX(36px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.hero-visual.is-unit-fading .study-figure img {
  animation: unit-hero-fade-in 1s ease both;
}

.hero-visual.is-unit-fading .study-card.question-card {
  animation: unit-hero-slide-in-left 2s ease both;
}

.hero-visual.is-unit-fading .study-card.progress-card {
  animation: unit-hero-slide-in-right 2s ease both;
}

@media (prefers-reduced-motion: reduce) {
  .hero-visual.is-unit-fading .study-figure img,
  .hero-visual.is-unit-fading .study-card {
    animation: none;
  }
}

.quick-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.route-card {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 160px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  padding: 28px 36px 28px 24px;
  box-shadow: var(--soft-shadow);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.route-card:hover {
  transform: translateY(-3px);
  border-color: #cacff1;
  box-shadow: var(--shadow);
}

.route-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.route-icon {
  display: grid;
  width: 66px;
  height: 66px;
  place-items: center;
  border-radius: 50%;
  font-size: 28px;
  font-weight: 900;
}

.route-icon-text {
  font-size: 26px;
  font-style: italic;
}

.route-blue .route-icon {
  background: var(--purple-soft);
  color: var(--purple);
}

.route-green .route-icon {
  background: var(--green-soft);
  color: var(--green);
}

.route-orange .route-icon {
  background: var(--orange-soft);
  color: var(--orange);
}

.route-purple .route-icon {
  background: var(--purple-soft);
  color: var(--purple);
}

.route-arrow {
  position: absolute;
  right: 26px;
  bottom: 23px;
  color: #8fa0d7;
  font-size: 28px;
  line-height: 1;
}

.dashboard-band {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: stretch;
  gap: clamp(20px, 3vw, 42px);
  border: 1px solid var(--line);
  border-radius: 12px;
  background:
    radial-gradient(circle at 0 100%, rgba(73, 111, 244, 0.12) 0 2px, transparent 2px) 0 100% / 9px 9px no-repeat,
    rgba(255, 255, 255, 0.96);
  padding: clamp(20px, 2.8vw, 34px);
  box-shadow: var(--soft-shadow);
}

.section-copy h2 {
  margin-bottom: 14px;
  font-size: 28px;
}

.section-copy p:not(.eyebrow) {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.8;
}

.recommendation-copy {
  min-width: 0;
}

.recommendation-copy .eyebrow {
  margin-bottom: 5px;
}

.recommendation-marquee {
  margin-top: 18px;
  height: 78px;
  width: min(100%, 500px);
  overflow: hidden;
  border: 1px solid #e5eaff;
  border-radius: 10px;
  background: linear-gradient(90deg, #f7f9ff, #fff);
}

.recommendation-track {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  box-sizing: border-box;
}

.recommendation-marquee:hover .recommendation-track,
.recommendation-marquee:focus-within .recommendation-track {
  animation-play-state: paused;
}

.recommendation-card {
  position: absolute;
  inset: 3px 0;
  display: grid;
  width: 100%;
  grid-template-columns: 150px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 16px;
  width: 100%;
  min-height: 72px;
  box-sizing: border-box;
  padding: 8px 3px;
  background: transparent;
  opacity: 0;
  transform: translateX(100%);
  transition: transform 420ms ease, opacity 420ms ease;
  pointer-events: none;
}

.recommendation-card.is-active {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

.recommendation-card.is-leaving {
  opacity: 0;
  transform: translateX(-100%);
}

.recommendation-card > span {
  grid-row: 1 / span 2;
  align-self: center;
  display: block;
  margin: 0;
  text-align: center;
  color: var(--blue);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.recommendation-card.is-question > span {
  color: var(--purple);
}

.recommendation-card strong {
  display: block;
  overflow: hidden;
  color: var(--ink);
  font-size: 12px;
  line-height: 1.45;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recommendation-card p {
  display: -webkit-box;
  overflow: hidden;
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.metric-row article {
  position: relative;
  min-height: 132px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 23px 72px 20px 25px;
  background: #fbfcff;
}

.metric-row span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.metric-row strong {
  display: block;
  margin: 13px 0 7px;
  color: var(--ink);
  font-size: 34px;
  line-height: 1;
}

.metric-row p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.metric-icon {
  position: absolute;
  right: 25px;
  top: 50%;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  transform: translateY(-50%);
}

.metric-icon::before {
  font-style: normal;
  font-weight: 900;
}

.metric-doc {
  background: #eef2fb;
  color: #9aa6c5;
}

.metric-doc::before {
  content: "▧";
}

.metric-course {
  background: var(--purple-soft);
  color: var(--purple);
}

.metric-course::before {
  content: "⌂";
}

.metric-ready {
  background: var(--green-soft);
  color: var(--green);
}

.metric-ready::before {
  content: "✓";
}

@media (max-width: 1180px) {
  .topbar {
    grid-template-columns: 1fr;
    padding: 18px 0;
  }

  .topbar-actions {
    grid-column: auto;
    justify-self: start;
    justify-content: flex-start;
  }

  .hero,
  .dashboard-band,
  .basket-shell,
  .question-detail-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 12px;
  }

  .hero-copy {
    max-width: 720px;
  }

  .hero-visual {
    min-height: clamp(460px, 58vw, 560px);
  }

  .quick-grid,
  .metric-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .brand-mark {
    font-size: 20px;
  }

  h1 {
    font-size: clamp(32px, 9vw, 42px);
  }

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-actions,
  .topbar-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-btn,
  .secondary-btn,
  .ghost-btn {
    width: 100%;
  }

  .hero-visual {
    min-height: 340px;
  }

  .window-frame,
  .clock-face {
    display: none;
  }

  .study-card.question-card {
    left: 0;
    top: 10px;
    width: min(220px, 58vw);
  }

  .progress-card {
    right: 0;
    top: 248px;
  }

  .study-figure {
    left: 10px;
    bottom: -42px;
    width: min(330px, 78vw);
    height: min(330px, 78vw);
  }

  .quick-grid,
  .metric-row {
    grid-template-columns: 1fr;
  }

  .route-card {
    min-height: 142px;
  }

  .dashboard-band {
    padding: var(--panel-pad);
  }

  .recommendation-card {
    grid-template-columns: 1fr;
    gap: 4px;
    min-height: 88px;
  }

  .recommendation-marquee {
    height: 102px;
  }

  .recommendation-card > span {
    grid-row: auto;
    align-self: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .recommendation-marquee {
    height: 78px;
  }

  .recommendation-track {
    width: 100%;
  }

  .recommendation-card {
    transition: none;
  }
}

/* v2.3 date practice page */
.date-page .date-hero {
  margin-bottom: 28px;
}

.date-page .date-hero-visual .study-figure {
  left: 165px;
  bottom: -8px;
}

.date-workspace {
  display: grid;
  gap: 28px;
}

.topic-workspace {
  display: grid;
  gap: 28px;
}

.formula-workspace {
  display: grid;
  gap: 28px;
}

.date-filter-panel,
.date-board,
.date-practice-view,
.topic-filter-panel,
.topic-board,
.topic-practice-view,
.formula-filter-panel,
.formula-board,
.formula-practice-view {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--soft-shadow);
}

.date-filter-panel,
.topic-filter-panel,
.formula-filter-panel {
  display: flex;
  flex-wrap: nowrap;
  align-items: end;
  gap: 14px;
  padding: clamp(16px, 2vw, 24px);
}

.date-filter-panel .field,
.topic-filter-panel .field,
.formula-filter-panel .field {
  flex: 1 1 0;
  min-width: 180px;
}

.date-filter-panel .unit-strip,
.topic-filter-panel .unit-strip,
.formula-filter-panel .unit-strip {
  flex: 0 0 60%;
  width: 60%;
  max-width: 60%;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  min-width: 0;
  margin-left: auto;
  overflow-x: auto;
  padding-bottom: 1px;
}

.date-filter-panel .unit-chip,
.topic-filter-panel .unit-chip,
.formula-filter-panel .unit-chip {
  flex: 0 0 auto;
  gap: 8px;
  min-height: 50px;
  min-width: 86px;
  justify-content: center;
  padding: 0 22px 0 17px;
  font-size: 13px;
  white-space: nowrap;
  box-shadow: none;
}

.field {
  display: grid;
  gap: 9px;
}

.field span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.field select {
  min-height: 50px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcff;
  color: var(--ink);
  font-size: 16px;
  font-weight: 800;
  padding: 0 14px;
}

.field input {
  min-height: 50px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcff;
  color: var(--ink);
  font-size: 16px;
  font-weight: 800;
  padding: 0 14px;
}

.field select:focus,
.field input:focus {
  border-color: #8f78ec;
  box-shadow: 0 0 0 4px rgba(89, 43, 231, 0.12);
  outline: none;
}

.date-board,
.date-practice-view,
.topic-board,
.topic-practice-view,
.formula-board,
.formula-practice-view {
  padding: var(--panel-pad);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}

.section-head h2,
.practice-summary h2 {
  margin: 0;
  color: var(--ink);
  font-size: 28px;
  font-weight: 900;
}

.count-pill {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 14px;
  background: rgba(250, 251, 255, 0.92);
  color: var(--muted);
  font-size: 15px;
  font-weight: 800;
}

.formula-grid,
.paper-card-grid,
.topic-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.formula-board .formula-grid {
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.unit-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.unit-chip {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 50px;
  border: 1px solid color-mix(in srgb, var(--unit-color) 42%, var(--line));
  border-radius: 999px;
  background: color-mix(in srgb, var(--unit-color) 10%, #ffffff);
  padding: 0 18px 0 16px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 900;
  box-shadow: none;
}

.unit-chip::before {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--unit-color);
  content: "";
}

.unit-chip:hover {
  border-color: color-mix(in srgb, var(--unit-color) 62%, transparent);
  background: color-mix(in srgb, var(--unit-color) 16%, #ffffff);
  color: var(--ink);
}

.unit-chip.active {
  border-color: color-mix(in srgb, var(--unit-color) 72%, transparent);
  background: color-mix(in srgb, var(--unit-color) 20%, #ffffff);
  color: var(--ink);
  box-shadow: none;
}

.unit-chip[data-unit-theme="all"] {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
}

.unit-chip[data-unit-theme="u1"] {
  --unit-color: var(--unit-u1);
  --unit-soft: var(--unit-u1-soft);
}

.unit-chip[data-unit-theme="u2"] {
  --unit-color: var(--unit-u2);
  --unit-soft: var(--unit-u2-soft);
}

.unit-chip[data-unit-theme="u3"] {
  --unit-color: var(--unit-u3);
  --unit-soft: var(--unit-u3-soft);
}

.unit-chip[data-unit-theme="u4"] {
  --unit-color: var(--unit-u4);
  --unit-soft: var(--unit-u4-soft);
}

.unit-chip[data-unit-theme="u5"] {
  --unit-color: var(--unit-u5);
  --unit-soft: var(--unit-u5-soft);
}

.paper-card,
.topic-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px 28px;
  min-height: 132px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 22px 24px;
  color: inherit;
  text-align: left;
  box-shadow: var(--soft-shadow);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.formula-board .formula-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px 24px;
  min-height: 150px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 20px 22px;
  color: inherit;
  text-align: left;
  box-shadow: var(--soft-shadow);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.paper-card .paper-card-info,
.paper-card .formula-info,
.topic-card .formula-info,
.topic-card .topic-info,
.formula-board .formula-card .formula-info {
  flex: 1 1 auto;
  min-width: 0;
}

.paper-card .paper-card-unit,
.topic-card .topic-card-side {
  flex: 0 0 auto;
}

.formula-board .formula-card .formula-image {
  flex: 0 0 auto;
  justify-self: unset;
}

.formula-board .formula-card.is-mastered .card-mastery-side {
  flex: 0 0 auto;
  min-width: 96px;
}

.formula-board .formula-card.is-mastered .card-mastery-image {
  width: 88px;
  max-height: 88px;
}

.formula-board .formula-card:hover,
.formula-board .formula-card:focus-visible,
.paper-card:hover,
.paper-card:focus-visible,
.topic-card:hover,
.topic-card:focus-visible {
  border-color: #cacff1;
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.paper-card::after,
.topic-card::after,
.formula-board .formula-card::after {
  flex: 0 0 auto;
  color: #8fa0d7;
  font-size: 28px;
  line-height: 1;
  content: ">";
}

.paper-card-info {
  min-width: 0;
}

.paper-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.paper-card-head h3 {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  font-weight: 900;
}

.paper-card-info p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.question-tags span.phase3-level1-tag,
.question-tags span.phase3-formula-tag,
.question-tags span.phase3-level2-tag,
.question-tags span.phase3-more-tag {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 800;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.question-tags span.phase3-level1-tag {
  border: 1px solid color-mix(in srgb, var(--blue) 28%, transparent);
  background: var(--blue-soft);
  color: var(--blue);
}

.question-tags span.phase3-formula-tag {
  border: 1px solid color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.question-tags span.phase3-level1-tag.is-current,
.question-tags span.phase3-formula-tag.is-current {
  box-shadow: inset 0 0 0 1px currentColor;
  font-weight: 900;
}

.question-tags span.phase3-more-tag,
.question-tags span.phase3-level2-tag {
  border: 1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
}

.question-tags span.practice-direction-tag {
  border: 1px solid transparent;
  font-weight: 900;
}

.question-tags span.practice-direction-tag.is-calculation {
  border-color: #e7bd73;
  background: #fff6e5;
  color: #925b09;
}

.question-tags span.practice-direction-tag.is-explanation {
  border-color: #c7b6ef;
  background: #f5f0ff;
  color: #62439d;
}

.question-tags span.practice-direction-tag.is-graph {
  border-color: #8ecfc2;
  background: #eaf8f4;
  color: #116d61;
}

.question-subquestion-tags {
  border-top: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
  background: #fbfcff;
  padding: 0;
}

.question-subquestion-tags summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  cursor: pointer;
  list-style: none;
}

.question-subquestion-tags summary::-webkit-details-marker {
  display: none;
}

.question-subquestion-tag-body {
  display: grid;
  gap: 8px;
  padding: 0 16px 14px;
}

.question-subquestion-label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
}

.question-subquestion-tags summary > strong {
  border-radius: 999px;
  background: var(--soft);
  padding: 3px 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.question-subquestion-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.question-subquestion-row strong {
  min-width: 28px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.question-subquestion-row span {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 700;
  line-height: 1.25;
}

.question-subquestion-row span.phase3-level1-tag {
  border: 1px solid color-mix(in srgb, var(--blue) 28%, transparent);
  background: var(--blue-soft);
  color: var(--blue);
}

.question-subquestion-row span.phase3-level2-tag {
  border: 1px solid color-mix(in srgb, var(--purple) 24%, transparent);
  background: var(--purple-soft);
  color: var(--purple);
}

.question-subquestion-row span.phase3-formula-tag {
  border: 1px solid color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.question-subquestion-row span.practice-direction-tag {
  border: 1px solid transparent;
  font-weight: 900;
}

.question-subquestion-row span.practice-direction-tag.is-calculation {
  border-color: #e7bd73;
  background: #fff6e5;
  color: #925b09;
}

.question-subquestion-row span.practice-direction-tag.is-explanation {
  border-color: #c7b6ef;
  background: #f5f0ff;
  color: #62439d;
}

.question-subquestion-row span.practice-direction-tag.is-graph {
  border-color: #8ecfc2;
  background: #eaf8f4;
  color: #116d61;
}

.topic-info h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.25;
}

.topic-info p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.topic-info > span,
.topic-info .card-progress-row > span {
  display: inline-flex;
  width: max-content;
  border-radius: 999px;
  background: var(--orange-soft);
  padding: 6px 11px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
}

.formula-info {
  display: grid;
  align-content: center;
}

.formula-info h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.25;
}

.formula-info p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.formula-info > span,
.formula-info .card-progress-row > span {
  display: inline-flex;
  width: max-content;
  border-radius: 999px;
  background: var(--orange-soft);
  padding: 6px 11px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
}

.card-progress {
  display: grid;
  gap: 8px;
  width: min(100%, 320px);
  margin-top: 14px;
}

.card-progress-row {
  display: flex;
  align-items: center;
  gap: 14px;
  width: min(100%, 420px);
  margin-top: 12px;
}

.card-progress-row .paper-card-count,
.card-progress-row > span {
  flex: 0 0 auto;
}

.card-progress-row .card-progress {
  flex: 1 1 auto;
  width: auto;
  min-width: 0;
  margin-top: 0;
}

.card-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.card-progress-meta strong {
  color: var(--ink);
  font-size: 13px;
  font-weight: 900;
}

.card-progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: color-mix(in srgb, var(--line) 70%, #ffffff);
}

.card-progress-track span {
  position: relative;
  display: block;
  height: 100%;
  overflow: hidden;
  border-radius: inherit;
  background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 48%, #f59e0b 100%);
  box-shadow: inset 0 0 6px rgba(255, 255, 255, 0.2);
}

.card-progress-track span::after {
  position: absolute;
  inset: 0;
  width: 34%;
  background: linear-gradient(
    105deg,
    transparent 0%,
    rgba(255, 255, 255, 0.04) 30%,
    rgba(255, 255, 255, 0.48) 50%,
    rgba(255, 255, 255, 0.06) 70%,
    transparent 100%
  );
  transform: translateX(-160%);
  animation: card-progress-shine var(--shine-duration, 6.2s) ease-in-out infinite;
  animation-delay: var(--shine-delay, 0s);
  content: "";
  pointer-events: none;
}

.card-progress.is-mastered .card-progress-track {
  box-shadow: 0 0 0 1px rgba(245, 158, 11, 0.18), 0 0 8px rgba(251, 191, 36, 0.22);
}

.card-progress.is-mastered .card-progress-track span {
  background: linear-gradient(90deg, #f59e0b 0%, #fbbf24 42%, #fde68a 58%, #f59e0b 100%);
}

@keyframes card-progress-shine {
  0% {
    transform: translateX(-160%);
  }
  28% {
    transform: translateX(280%);
  }
  100% {
    transform: translateX(280%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .card-progress-track span::after {
    animation: none;
    opacity: 0.35;
    transform: translateX(40%);
  }
}

.card-progress-meta .card-mastery-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 24px;
  border-radius: 999px;
  background: color-mix(in srgb, #fff4df 78%, #ffffff);
  padding: 0 9px;
  color: #b45309;
  font-size: 11px;
  font-weight: 900;
  white-space: nowrap;
}

.card-crown-icon {
  display: inline-block;
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: #f59e0b;
  stroke: #b45309;
  stroke-width: 0.9;
  stroke-linejoin: round;
}

.card-crown-icon-sm {
  width: 13px;
  height: 13px;
}

.card-crown-icon-lg {
  width: 48px;
  height: 48px;
  stroke-width: 0.7;
  filter: drop-shadow(0 3px 6px rgba(180, 83, 9, 0.22));
}

.card-mastery-title-mark {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
  vertical-align: -3px;
}

.card-mastery-side {
  display: grid;
  justify-items: center;
  align-content: center;
  gap: 6px;
  min-width: 120px;
  padding: 2px 4px;
}

.card-mastery-image {
  display: block;
  width: 108px;
  height: auto;
  max-height: 108px;
  object-fit: contain;
  filter: drop-shadow(0 6px 14px rgba(180, 83, 9, 0.18));
  pointer-events: none;
  user-select: none;
}

.card-mastery-caption {
  color: #b45309;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.paper-card.is-mastered,
.topic-card.is-mastered,
.formula-board .formula-card.is-mastered {
  border-color: color-mix(in srgb, #f59e0b 34%, var(--line));
  background:
    linear-gradient(180deg, rgba(255, 247, 237, 0.72), rgba(255, 255, 255, 0.98)),
    #fff;
  box-shadow: 0 14px 30px rgba(180, 83, 9, 0.08);
}

.formula-image {
  --formula-image-height: 96px;
  --formula-image-width: 450px;
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
  box-sizing: border-box;
  display: flex;
  width: var(--formula-image-width);
  max-width: 100%;
  min-height: var(--formula-image-height);
  justify-self: end;
  align-items: center;
  justify-content: center;
  border: 1px solid color-mix(in srgb, var(--unit-color) 28%, var(--line));
  border-radius: 10px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--unit-color) 14%, #ffffff), rgba(255, 255, 255, 0.9)),
    var(--unit-soft);
  padding: 14px 16px;
  overflow: visible;
}

.formula-image[data-unit-theme="all"] {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
}

.formula-image[data-unit-theme="u1"] {
  --unit-color: var(--unit-u1);
  --unit-soft: var(--unit-u1-soft);
}

.formula-image[data-unit-theme="u2"] {
  --unit-color: var(--unit-u2);
  --unit-soft: var(--unit-u2-soft);
}

.formula-image[data-unit-theme="u3"] {
  --unit-color: var(--unit-u3);
  --unit-soft: var(--unit-u3-soft);
}

.formula-image[data-unit-theme="u4"] {
  --unit-color: var(--unit-u4);
  --unit-soft: var(--unit-u4-soft);
}

.formula-image[data-unit-theme="u5"] {
  --unit-color: var(--unit-u5);
  --unit-soft: var(--unit-u5-soft);
}

.formula-image img {
  display: block;
  box-sizing: border-box;
  width: auto;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  flex: 0 0 auto;
}

.formula-image .formula-latex,
.formula-image .formula-latex-fallback,
.formula-practice-view .selected-formula-image .formula-latex,
.formula-practice-view .selected-formula-image .formula-latex-fallback {
  max-width: 100%;
  color: var(--ink);
  text-align: center;
  line-height: 1.35;
}

.formula-image .katex,
.formula-practice-view .selected-formula-image .katex {
  font-size: 1.12em;
  color: var(--ink);
}

.formula-practice-view .selected-formula-image .katex {
  font-size: 1.28em;
}

.formula-image .katex-display,
.formula-practice-view .selected-formula-image .katex-display {
  margin: 0;
  overflow: visible;
}

.formula-image .katex-display > .katex,
.formula-image .katex-html,
.formula-practice-view .selected-formula-image .katex-display > .katex,
.formula-practice-view .selected-formula-image .katex-html {
  max-width: none;
  overflow: visible;
}

.formula-latex-fallback {
  font-weight: 800;
  font-size: 15px;
}

.formula-image-placeholder {
  display: grid;
  width: 100%;
  min-height: 110px;
  place-items: center;
  border-radius: 8px;
  background: var(--soft);
  color: var(--muted);
  font-weight: 900;
}

.paper-card-count {
  display: inline-flex;
  width: max-content;
  border-radius: 999px;
  background: var(--orange-soft);
  padding: 6px 11px;
  color: var(--orange);
  font-size: 13px;
  font-weight: 900;
}

.paper-card-unit {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
  display: grid;
  width: 66px;
  height: 66px;
  place-items: center;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--unit-color) 28%, transparent);
  background: color-mix(in srgb, var(--unit-color) 14%, #ffffff);
  color: var(--unit-color);
  font-size: 18px;
  font-weight: 900;
}

.topic-card-side {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
  display: grid;
  width: 66px;
  height: 66px;
  place-items: center;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--unit-color) 28%, transparent);
  background: color-mix(in srgb, var(--unit-color) 14%, #ffffff);
  color: var(--unit-color);
  font-size: 18px;
  font-weight: 900;
  gap: 5px;
  overflow: hidden;
}

.topic-card-side strong {
  font-size: 15px;
  line-height: 1;
  text-align: center;
}

.topic-card-side div {
  display: none;
}

.topic-card-side[data-unit-theme="all"],
.paper-card-unit[data-unit-theme="all"] {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
}

.topic-card-side[data-unit-theme="u1"],
.paper-card-unit[data-unit-theme="u1"],
.paper-card-unit.is-u1 {
  --unit-color: var(--unit-u1);
  --unit-soft: var(--unit-u1-soft);
}

.topic-card-side[data-unit-theme="u2"],
.paper-card-unit[data-unit-theme="u2"],
.paper-card-unit.is-u2 {
  --unit-color: var(--unit-u2);
  --unit-soft: var(--unit-u2-soft);
}

.topic-card-side[data-unit-theme="u3"],
.paper-card-unit[data-unit-theme="u3"],
.paper-card-unit.is-u3,
.paper-card-unit.is-u6 {
  --unit-color: var(--unit-u3);
  --unit-soft: var(--unit-u3-soft);
}

.topic-card-side[data-unit-theme="u4"],
.paper-card-unit[data-unit-theme="u4"],
.paper-card-unit.is-u4 {
  --unit-color: var(--unit-u4);
  --unit-soft: var(--unit-u4-soft);
}

.topic-card-side[data-unit-theme="u5"],
.paper-card-unit[data-unit-theme="u5"],
.paper-card-unit.is-u5 {
  --unit-color: var(--unit-u5);
  --unit-soft: var(--unit-u5-soft);
}

.practice-head {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px 32px;
  margin-bottom: 22px;
}

.practice-head-copy {
  flex: 1 1 auto;
  min-width: 0;
}

.topic-practice-view .practice-head-copy,
.date-practice-view .practice-head-copy,
.formula-practice-view .practice-head-copy {
  flex: 1 1 70%;
  min-width: min(100%, 520px);
}

.practice-head-copy .eyebrow {
  margin: 0 0 8px;
}

.practice-head-copy h1 {
  margin: 0 0 8px;
}

.practice-head-copy .muted {
  margin: 0;
}

.practice-head-aside {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.back-btn {
  flex: 0 0 auto;
  white-space: nowrap;
}

.selected-formula-image {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
  box-sizing: border-box;
  display: grid;
  width: 86px;
  height: 86px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--unit-color) 28%, transparent);
  border-radius: 50%;
  background: color-mix(in srgb, var(--unit-color) 14%, #ffffff);
  aspect-ratio: 1 / 1;
}

.selected-topic-badge-wrap {
  width: 86px;
  height: 86px;
  overflow: hidden;
}

.selected-topic-badge {
  display: inline-flex;
  width: 58px;
  height: 58px;
  min-width: 58px;
  min-height: 58px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--unit-color);
  color: #fff;
  font-weight: 900;
  line-height: 1;
  text-align: center;
}

.selected-topic-badge-wrap[data-unit-theme="all"],
.practice-head-aside .selected-formula-image[data-unit-theme="all"] {
  --unit-color: var(--unit-all);
  --unit-soft: var(--unit-all-soft);
}

.selected-topic-badge-wrap[data-unit-theme="u1"],
.practice-head-aside .selected-formula-image[data-unit-theme="u1"] {
  --unit-color: var(--unit-u1);
  --unit-soft: var(--unit-u1-soft);
}

.selected-topic-badge-wrap[data-unit-theme="u2"],
.practice-head-aside .selected-formula-image[data-unit-theme="u2"] {
  --unit-color: var(--unit-u2);
  --unit-soft: var(--unit-u2-soft);
}

.selected-topic-badge-wrap[data-unit-theme="u3"],
.practice-head-aside .selected-formula-image[data-unit-theme="u3"] {
  --unit-color: var(--unit-u3);
  --unit-soft: var(--unit-u3-soft);
}

.selected-topic-badge-wrap[data-unit-theme="u4"],
.practice-head-aside .selected-formula-image[data-unit-theme="u4"] {
  --unit-color: var(--unit-u4);
  --unit-soft: var(--unit-u4-soft);
}

.selected-topic-badge-wrap[data-unit-theme="u5"],
.practice-head-aside .selected-formula-image[data-unit-theme="u5"] {
  --unit-color: var(--unit-u5);
  --unit-soft: var(--unit-u5-soft);
}

#selected-paper-title,
#selected-topic-title,
#selected-formula-title {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.1;
  font-weight: 900;
}

#selected-topic-title,
#selected-formula-title {
  max-width: none;
  width: 100%;
}

#selected-paper-meta,
#selected-topic-meta,
#selected-formula-meta,
.muted {
  color: var(--muted);
}

.formula-practice-view .selected-formula-image {
  box-sizing: border-box;
  display: flex;
  width: 450px;
  max-width: 100%;
  height: auto;
  min-height: 96px;
  aspect-ratio: auto;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  border-color: color-mix(in srgb, var(--unit-color) 28%, var(--line));
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--unit-color) 14%, #ffffff), rgba(255, 255, 255, 0.9)),
    var(--unit-soft);
  padding: 14px 16px;
  overflow: visible;
}

.formula-practice-view .selected-formula-image img {
  display: block;
  box-sizing: border-box;
  width: auto;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  object-position: center;
  flex: 0 0 auto;
}

/* v2.3 basket page */
.basket-page-v23 .basket-hero {
  margin-bottom: 36px;
}

.basket-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.34fr);
  align-items: start;
  gap: clamp(16px, 2vw, 24px);
}

.review-page-v23 .basket-shell {
  grid-template-columns: 1fr;
}

.review-page-v23 .textbook-practice-shell {
  margin-bottom: var(--section-gap);
}

.review-page-v23 .submission-history-shell {
  margin-top: var(--section-gap);
}

.review-page-v23 .textbook-practice-panel {
  background:
    linear-gradient(180deg, rgba(240, 234, 255, 0.72) 0%, rgba(255, 255, 255, 0.96) 140px),
    rgba(255, 255, 255, 0.96);
}

.review-page-v23 .textbook-practice-lead {
  margin: 8px 0 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.review-page-v23 .textbook-practice-panel .count-pill {
  border-color: color-mix(in srgb, var(--purple) 28%, var(--line));
  background: color-mix(in srgb, var(--purple-soft) 70%, #fff);
  color: color-mix(in srgb, var(--purple) 72%, var(--ink));
}

.review-page-v23 .textbook-practice-list {
  gap: 12px;
}

.handbook-view-switch {
  position: sticky;
  top: 86px;
  z-index: 90;
  display: flex;
  gap: 8px;
  margin: 20px 0;
  padding: 8px 0 0;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 8px 12px -14px rgba(35, 42, 91, 0.45);
  backdrop-filter: blur(10px);
}

.handbook-view-switch button {
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 10px 4px 9px;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
}

.handbook-view-switch button.is-active {
  border-bottom-color: var(--purple);
  color: var(--ink);
}

@media (max-width: 1180px) {
  .handbook-view-switch {
    top: 124px;
  }
}

.handbook-layout {
  display: grid;
  grid-template-columns: minmax(190px, 0.26fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.handbook-layout.is-nav-collapsed {
  grid-template-columns: 42px minmax(0, 1fr);
}

.handbook-topic-nav {
  position: sticky;
  top: 164px;
  max-height: calc(100vh - 180px);
  overflow-y: auto;
  padding-right: 20px;
  border-right: 1px solid var(--line);
}

.handbook-nav-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

@media (max-width: 1180px) {
  .handbook-topic-nav {
    top: 202px;
    max-height: calc(100vh - 218px);
  }
}

.handbook-nav-label {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.handbook-nav-toggle {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--muted);
  font: inherit;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.handbook-nav-toggle:hover {
  border-color: var(--purple);
  color: var(--purple);
}

.handbook-layout.is-nav-collapsed .handbook-topic-nav {
  overflow: visible;
  padding-right: 0;
}

.handbook-layout.is-nav-collapsed .handbook-nav-heading {
  justify-content: center;
}

.handbook-layout.is-nav-collapsed .handbook-nav-label,
.handbook-layout.is-nav-collapsed .handbook-topic-links {
  display: none;
}

.handbook-layout.is-nav-collapsed .handbook-unit-links,
.handbook-layout.is-nav-collapsed .handbook-topic-group {
  display: none;
}

.handbook-unit-links {
  display: grid;
  gap: 4px;
  margin: 0 0 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.handbook-unit-bookmark {
  --handbook-unit-color: var(--unit-all);
  --handbook-unit-soft: var(--unit-all-soft);
  display: block;
  width: 100%;
  margin: 0;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
}

.handbook-unit-bookmark[data-unit-theme="u1"] { --handbook-unit-color: var(--unit-u1); --handbook-unit-soft: var(--unit-u1-soft); }
.handbook-unit-bookmark[data-unit-theme="u2"] { --handbook-unit-color: var(--unit-u2); --handbook-unit-soft: var(--unit-u2-soft); }
.handbook-unit-bookmark[data-unit-theme="u3"],
.handbook-unit-bookmark[data-unit-theme="u6"] { --handbook-unit-color: var(--unit-u3); --handbook-unit-soft: var(--unit-u3-soft); }
.handbook-unit-bookmark[data-unit-theme="u4"] { --handbook-unit-color: var(--unit-u4); --handbook-unit-soft: var(--unit-u4-soft); }
.handbook-unit-bookmark[data-unit-theme="u5"] { --handbook-unit-color: var(--unit-u5); --handbook-unit-soft: var(--unit-u5-soft); }

.handbook-unit-bookmark > summary,
.handbook-unit-bookmark.handbook-unit-link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
  min-height: 48px;
  border: 0;
  border-left: 3px solid transparent;
  padding: 7px 6px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font: inherit;
  cursor: pointer;
  list-style: none;
}

.handbook-unit-bookmark > summary::-webkit-details-marker {
  display: none;
}

.handbook-unit-bookmark > summary:hover,
.handbook-unit-bookmark.is-active > summary,
.handbook-unit-bookmark.handbook-unit-link:hover,
.handbook-unit-bookmark.handbook-unit-link.is-active {
  border-left-color: var(--handbook-unit-color);
  background: var(--handbook-unit-soft);
  color: var(--ink);
}

.handbook-bookmark-chevron {
  color: var(--handbook-unit-color);
  font-size: 18px;
  line-height: 1;
  transition: transform 160ms ease;
}

.handbook-unit-bookmark[open] .handbook-bookmark-chevron {
  transform: rotate(90deg);
}

.handbook-bookmark-topics {
  margin: 0 0 6px 10px;
  padding: 2px 0 4px 4px;
}

.handbook-bookmark-topics .handbook-topic-links,
.handbook-bookmark-topics {
  display: grid;
  gap: 2px;
}

.handbook-bookmark-topics button {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 7px;
  width: 100%;
  border: 0;
  border-left: 2px solid transparent;
  padding: 7px 6px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.32;
  cursor: pointer;
}

.handbook-bookmark-topics button:hover,
.handbook-bookmark-topics button.is-active {
  border-left-color: var(--handbook-unit-color);
  background: var(--handbook-unit-soft);
  color: var(--ink);
}

.handbook-bookmark-topics .handbook-topic-number {
  color: var(--handbook-unit-color);
}

.handbook-topic-loading {
  margin: 7px 6px;
  color: var(--muted);
  font-size: 11px;
}

.handbook-unit-number {
  color: var(--handbook-unit-color);
  font-size: 11px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.handbook-unit-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.handbook-unit-copy strong {
  font-size: 12px;
}

.handbook-unit-copy span {
  overflow: hidden;
  font-size: 10px;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.handbook-unit-status {
  color: var(--handbook-unit-color);
  font-size: 10px;
  font-weight: 800;
  white-space: nowrap;
}

.handbook-topic-group-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.07em;
}

.handbook-topic-links {
  display: grid;
  gap: 3px;
}

.handbook-topic-links button {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  width: 100%;
  border: 0;
  border-left: 2px solid transparent;
  padding: 8px 8px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.38;
  cursor: pointer;
}

.handbook-topic-links button:hover,
.handbook-topic-links button.is-active {
  border-left-color: var(--purple);
  background: var(--purple-soft);
  color: var(--ink);
}

.handbook-topic-number {
  color: var(--purple);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.handbook-developing {
  --handbook-unit-color: var(--unit-all);
  --handbook-unit-soft: var(--unit-all-soft);
  min-height: 260px;
  padding: 42px 36px;
  border-left: 4px solid var(--handbook-unit-color);
  background: var(--handbook-unit-soft);
}

.handbook-developing[data-unit-theme="u3"],
.handbook-developing[data-unit-theme="u6"] { --handbook-unit-color: var(--unit-u3); --handbook-unit-soft: var(--unit-u3-soft); }
.handbook-developing[data-unit-theme="u4"] { --handbook-unit-color: var(--unit-u4); --handbook-unit-soft: var(--unit-u4-soft); }
.handbook-developing[data-unit-theme="u5"] { --handbook-unit-color: var(--unit-u5); --handbook-unit-soft: var(--unit-u5-soft); }

.handbook-developing > span {
  color: var(--handbook-unit-color);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.handbook-developing h4 {
  margin: 14px 0 8px;
  color: var(--ink);
  font-size: 22px;
}

.handbook-developing p {
  margin: 0;
  color: var(--muted);
}

.handbook-article {
  min-width: 0;
}

.handbook-article-header {
  margin-bottom: 26px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.handbook-article-header p {
  margin: 0 0 7px;
  color: var(--purple);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.handbook-article-header h3 {
  margin: 0;
  font-size: 25px;
  line-height: 1.25;
}

.handbook-content {
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
}

.handbook-content h2,
.handbook-content h3,
.handbook-content h4 {
  scroll-margin-top: 24px;
}

.handbook-content h2 {
  margin: 38px 0 14px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
  font-size: 22px;
  line-height: 1.35;
}

.handbook-content h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.handbook-content h3 {
  margin: 30px 0 12px;
  color: #23314d;
  font-size: 19px;
  line-height: 1.35;
}

.handbook-content h4 {
  margin: 24px 0 8px;
  color: #345a6c;
  font-size: 16px;
  line-height: 1.4;
}

.handbook-content p {
  margin: 0 0 14px;
}

.handbook-list {
  margin: 0 0 16px;
  padding-left: 24px;
}

.handbook-list li + li {
  margin-top: 5px;
}

.handbook-formula {
  display: flex;
  justify-content: center;
  overflow-x: auto;
  margin: 18px 0;
  padding: 14px 18px;
  border: 1px solid #d7e4e0;
  border-radius: 6px;
  background: #fbfefd;
}

.handbook-callout {
  margin: 20px 0;
  padding: 13px 16px 12px;
  border-left: 3px solid #4e8eab;
  background: #f2f8fb;
}

.handbook-callout > span {
  display: block;
  margin-bottom: 4px;
  color: #2e6784;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.handbook-callout p:last-child {
  margin-bottom: 0;
}

.handbook-callout.definition {
  border-left-color: #317a67;
  background: #edf8f3;
}

.handbook-callout.definition > span {
  color: #276a58;
}

.handbook-callout.common-mistake {
  border-left-color: #bd5b4a;
  background: #fff4f1;
}

.handbook-callout.common-mistake > span {
  color: #a64939;
}

.handbook-core-sentence {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  margin: 10px 0;
  padding: 11px 13px;
  border: 1px solid #d7e1e3;
  border-radius: 5px;
  background: #fbfcfc;
}

.handbook-core-sentence > span {
  display: grid;
  min-height: 26px;
  place-items: center;
  border-radius: 4px;
  color: #4b2784;
  background: #ede4fc;
  font-size: 12px;
  font-weight: 850;
}

.handbook-core-sentence > p {
  margin: 2px 0;
  color: #2d4552;
  font-weight: 650;
  line-height: 1.55;
}

.handbook-checklist {
  padding-left: 0;
  list-style: none;
}

.handbook-checklist li {
  margin: 8px 0;
}

.handbook-checklist label {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  cursor: pointer;
}

.handbook-checklist input {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  margin: 3px 0 0;
  accent-color: var(--purple);
}

.handbook-table-wrap {
  overflow-x: auto;
  margin: 18px 0;
}

.handbook-table {
  width: 100%;
  min-width: 500px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.55;
}

.handbook-table th,
.handbook-table td {
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.handbook-table th {
  color: #2d4552;
  background: #f5f8f9;
  font-weight: 850;
}

.handbook-diagram {
  width: 100%;
  margin: 22px 0;
  overflow: visible;
  text-align: center;
}

.handbook-diagram-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 14px;
  margin: 22px 0;
}

.handbook-diagram-group .handbook-diagram {
  width: auto;
  margin: 0;
}

.handbook-diagram img {
  display: inline-block;
  width: 480px;
  max-width: 100%;
  height: auto;
}

.handbook-diagram-pending {
  min-height: 86px;
  margin: 22px 0;
  border: 1px dashed #b7c4c7;
  color: var(--muted);
  display: grid;
  place-items: center;
  font-size: 13px;
}

.handbook-question-source {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin: 18px 0 0;
  color: #5d6d75;
  font-size: 13px;
}

.handbook-question-source strong {
  color: #2d4552;
}

.handbook-worked-question,
.handbook-worked-solution {
  margin: 12px 0 22px;
  padding: 18px 20px;
  border: 1px solid #d7e1e3;
  border-radius: 6px;
}

.handbook-worked-example {
  margin: 16px 0;
  border: 1px solid #d9c9f4;
  border-radius: 6px;
  background: #fff;
}

.handbook-worked-example > summary {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 16px;
  cursor: pointer;
  color: #472579;
  background: #f5efff;
  font-weight: 800;
  list-style: none;
}

.handbook-worked-example > summary::-webkit-details-marker {
  display: none;
}

.handbook-worked-example > summary::after {
  margin-left: auto;
  color: #7a43c6;
  content: "+";
  font-size: 22px;
  font-weight: 500;
}

.handbook-worked-example[open] > summary {
  border-bottom: 1px solid #ddcff8;
}

.handbook-worked-example[open] > summary::after {
  content: "-";
}

.handbook-worked-example > :not(summary) {
  margin-left: 16px;
  margin-right: 16px;
}

.handbook-practice-question {
  margin: 10px 0;
  border: 1px solid #d7e1e3;
  border-radius: 6px;
  background: #fff;
}

.handbook-practice-question > summary {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  cursor: pointer;
  color: #2d4552;
  background: #f5f8f9;
  font-weight: 750;
  list-style: none;
}

.handbook-practice-question > summary::-webkit-details-marker {
  display: none;
}

.handbook-practice-question > summary::after {
  margin-left: auto;
  color: #52717b;
  content: "+";
  font-size: 20px;
  font-weight: 500;
}

.handbook-practice-question[open] > summary {
  border-bottom: 1px solid #d7e1e3;
}

.handbook-practice-question[open] > summary::after {
  content: "-";
}

.handbook-practice-question > :not(summary) {
  margin-left: 14px;
  margin-right: 14px;
}

.handbook-practice-ms {
  margin: 16px 0 14px;
  border: 1px solid #d9c9f4;
  border-radius: 5px;
  background: #fbf9ff;
}

.handbook-practice-ms > summary {
  padding: 9px 12px;
  cursor: pointer;
  color: #5a3093;
  font-size: 14px;
  font-weight: 750;
}

.handbook-practice-ms-body {
  padding: 4px 12px 14px;
  color: #5d6d75;
  font-size: 14px;
}

.handbook-ms-entry + .handbook-ms-entry {
  margin-top: 12px;
}

.handbook-ms-entry img {
  display: block;
  width: min(720px, 100%);
  height: auto;
  margin: 0 auto;
}

.handbook-worked-question {
  background: #fbfcfc;
}

.handbook-worked-solution {
  background: #f7f3ff;
  border-color: #ddcff8;
  border-left: 3px solid #7a43c6;
}

.handbook-question-image,
.handbook-question-image-pair {
  margin: 16px auto 2px;
  text-align: center;
}

.handbook-question-image-pair {
  display: grid;
  gap: 0;
  justify-items: center;
}

.handbook-question-image {
  overflow: visible;
}

.handbook-question-image img {
  display: block;
  width: min(720px, 100%);
  height: auto;
  margin: 0 auto;
}

.handbook-teaching-image,
.handbook-teaching-image-group {
  margin: 18px auto;
  text-align: center;
}

.handbook-teaching-image-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.handbook-teaching-image-group .handbook-teaching-image {
  margin: 0;
}

.handbook-teaching-image img {
  display: block;
  width: min(620px, 100%);
  height: auto;
  margin: 0 auto;
}

.handbook-table-image {
  display: block;
  width: min(220px, 100%);
  height: auto;
  margin: 0 auto;
}

.handbook-question-image-missing {
  margin: 16px 0;
  padding: 14px;
  border: 1px dashed #b7c4c7;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.handbook-worked-divider {
  height: 1px;
  margin: 14px 0;
  border: 0;
  background: #dce5e5;
}

.handbook-answer-option {
  display: inline-grid;
  min-width: 36px;
  min-height: 32px;
  margin: 4px 0;
  padding: 3px 10px;
  place-items: center;
  border: 1px solid #407a67;
  border-radius: 4px;
  color: #1f5546;
  font-weight: 800;
}

@media (max-width: 780px) {
  .handbook-layout {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .handbook-topic-nav {
    position: static;
    max-height: none;
    overflow-x: auto;
    padding: 0 0 10px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .handbook-layout.is-nav-collapsed {
    grid-template-columns: 1fr;
  }

  .handbook-layout.is-nav-collapsed .handbook-topic-nav {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .handbook-layout.is-nav-collapsed .handbook-nav-label {
    display: block;
  }

  .handbook-layout.is-nav-collapsed .handbook-topic-links {
    display: none;
  }

  .handbook-unit-links {
    display: flex;
    width: max-content;
    margin: 0;
    padding: 0 0 10px;
    border-bottom: 0;
  }

  .handbook-unit-bookmark {
    width: 142px;
  }

  .handbook-layout.is-nav-collapsed .handbook-unit-links {
    display: none;
  }

  .handbook-topic-links {
    display: flex;
    width: max-content;
  }

  .handbook-topic-links button {
    width: 150px;
    min-height: 58px;
  }

  .handbook-article-header h3 {
    font-size: 22px;
  }

  .handbook-content {
    font-size: 15px;
  }
}

.review-page-v23 .textbook-unit-group {
  border: 1px solid color-mix(in srgb, var(--unit-color, var(--line)) 28%, var(--line));
  border-radius: 14px;
  background: color-mix(in srgb, var(--unit-soft, #f8fafc) 72%, #ffffff);
  overflow: hidden;
}

.review-page-v23 .textbook-unit-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0;
}

.review-page-v23 .textbook-unit-group > summary::before {
  display: none;
  content: none;
}

.review-page-v23 .textbook-unit-badge {
  display: inline-grid;
  place-items: center;
  min-width: 48px;
  height: 48px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--unit-color, var(--blue)) 16%, #fff);
  color: var(--unit-color, var(--blue));
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.02em;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--unit-color, var(--blue)) 28%, transparent);
}

.review-page-v23 .textbook-unit-copy {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.review-page-v23 .textbook-unit-name {
  color: var(--ink);
  font-size: 16px;
  font-weight: 900;
  line-height: 1.3;
}

.review-page-v23 .textbook-unit-meta {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.review-page-v23 .textbook-unit-chevron {
  width: 28px;
  height: 28px;
  border-radius: 999px;
  background:
    color-mix(in srgb, var(--unit-color, var(--blue)) 12%, #fff)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M6 4l4 4-4 4' stroke='%23596386' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center / 14px 14px no-repeat;
  transition: transform 0.18s ease;
}

.review-page-v23 .textbook-unit-group[open] > .textbook-unit-summary .textbook-unit-chevron {
  transform: rotate(90deg);
}

.review-page-v23 .textbook-unit-group > .textbook-unit-summary:hover {
  background: color-mix(in srgb, var(--unit-soft, #f8fafc) 88%, #ffffff);
}

.review-page-v23 .textbook-topic-list {
  gap: 8px;
  padding: 0 12px 12px;
}

.review-page-v23 .textbook-topic-item {
  border-color: color-mix(in srgb, var(--unit-color, var(--line)) 18%, var(--line));
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.02);
}

.review-page-v23 .textbook-topic-item > summary {
  grid-template-columns: auto minmax(0, 1fr) auto;
  column-gap: 12px;
  padding: 12px 14px;
}

.review-page-v23 .textbook-topic-item > summary::before {
  display: none;
  content: none;
}

.review-page-v23 .textbook-topic-index {
  display: inline-grid;
  place-items: center;
  min-width: 34px;
  height: 34px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--unit-color, var(--blue)) 10%, #fff);
  color: color-mix(in srgb, var(--unit-color, var(--blue)) 78%, var(--ink));
  font-size: 12px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.review-page-v23 .textbook-topic-qcount {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  border-radius: 999px;
  padding: 0 10px;
  background: var(--soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.review-page-v23 .textbook-topic-item[open] > summary {
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.review-page-v23 .review-history-panel .section-head {
  margin-bottom: 16px;
}

.review-page-v23 .textbook-question-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-top: 1px solid rgba(15, 23, 42, 0.06);
}

.review-page-v23 .textbook-question-row-main {
  min-width: 0;
  display: grid;
  gap: 6px;
}

.review-history-list {
  display: grid;
  gap: 18px;
}

.review-history-pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 18px;
}

.review-history-page-btn {
  min-width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.review-history-page-btn:hover {
  border-color: rgba(95, 72, 201, 0.35);
}

.review-history-page-btn.is-active {
  border-color: var(--purple);
  background: var(--purple);
  color: #fff;
}

.review-history-day {
  display: grid;
  gap: 8px;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  overflow: visible;
}

.review-history-day > summary,
.review-history-item > summary {
  cursor: pointer;
  list-style: none;
}

.review-history-day > summary::-webkit-details-marker,
.review-history-item > summary::-webkit-details-marker,
.review-history-day > summary::marker,
.review-history-item > summary::marker {
  display: none;
  content: "";
}

.review-history-day > summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 0 2px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.review-history-day > summary::before,
.review-history-item > summary::before {
  color: var(--muted);
  content: "\25B6";
  font-size: 10px;
}

.review-history-day[open] > summary::before,
.review-history-item[open] > summary::before {
  content: "\25BC";
}

.review-history-day-count {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.review-history-day-list {
  display: grid;
  gap: 8px;
  padding: 0;
  background: transparent;
}

.review-history-item {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  overflow: hidden;
}

.review-history-item > summary {
  display: grid;
  grid-template-columns: auto 3.25rem minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 10px;
  padding: 12px 14px;
}

.review-history-item-copy {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.review-history-time {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.review-history-title {
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.3;
}

.review-history-status {
  display: inline-flex;
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--green-soft);
  padding: 5px 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 900;
  white-space: nowrap;
}

.review-history-item-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.review-add-basket-btn {
  width: auto;
  min-height: 34px;
  padding: 6px 12px;
  font-size: 13px;
  white-space: nowrap;
}

.review-add-basket-btn.is-added {
  border-color: color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.review-history-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
}

.review-history-item-meta span {
  display: inline-flex;
  border-radius: 999px;
  background: var(--soft);
  padding: 3px 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.review-history-questions {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0 4px 8px;
}

.review-history-item[open] > summary {
  border-bottom: 1px solid var(--line);
}

.review-history-questions .question-card {
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.review-history-questions .question-card + .question-card {
  border-top: 1px solid var(--line);
}

.review-history-questions .question-summary {
  grid-template-columns: minmax(0, 1fr) auto auto;
  padding: 12px 4px 10px 12px;
  background: transparent;
}

.review-question-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 6px;
  padding-right: 8px;
}

.review-history-questions .expand-indicator {
  justify-self: end;
  width: auto;
  white-space: nowrap;
}

.review-question-basket-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 7px 12px;
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.25;
  white-space: nowrap;
  cursor: pointer;
}

.review-question-basket-btn:hover {
  border-color: #c2d7ff;
  background: var(--blue-soft);
  color: var(--blue);
}

.review-question-basket-btn.is-added {
  border-color: color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.review-history-questions .question-card.open .question-summary {
  border-bottom: 0;
}

.review-history-questions .question-body {
  padding: 0 12px 14px;
  border-top: 0;
  background: transparent;
}

.review-question-layout {
  display: grid;
  grid-template-columns: minmax(0, 65%) minmax(200px, 1fr);
  gap: 14px 18px;
  align-items: start;
}

.review-question-media {
  display: grid;
  gap: 10px;
  min-width: 0;
}

.review-question-paper,
.review-ms-body,
.review-ms-entry {
  display: grid;
  gap: 8px;
}

.review-history-questions .question-body img {
  width: 100%;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.review-question-aside {
  display: grid;
  gap: 16px;
  min-width: 0;
  padding-top: 2px;
}

.review-question-aside h3 {
  margin: 0 0 8px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 850;
}

.review-aside-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.review-aside-tags span {
  display: inline-flex;
  max-width: 100%;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  font-weight: 800;
  line-height: 1.25;
}

.review-aside-tags .phase3-level1-tag {
  border: 1px solid color-mix(in srgb, var(--blue) 28%, transparent);
  background: var(--blue-soft);
  color: var(--blue);
}

.review-aside-tags .phase3-formula-tag {
  border: 1px solid color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.review-aside-tags .phase3-formula-tag.is-empty {
  min-width: 4.5em;
  min-height: 1.65em;
  border-style: dashed;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.review-aside-tags .phase3-level2-tag {
  border: 1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
}

.review-aside-empty,
.review-aside-note {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.review-aside-note {
  margin-top: 8px;
}

.review-frozen-mark-badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid color-mix(in srgb, var(--line) 80%, #9aa8c7);
  border-radius: 999px;
  background: color-mix(in srgb, #eef3ff 70%, #fff);
  padding: 2px 8px;
  color: #44557a;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.review-self-mark {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.review-self-mark-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 6px 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
}

.review-self-mark-btn:hover {
  border-color: #c2d7ff;
  color: var(--blue);
}

.review-self-mark-btn[data-self-mark="correct"].is-active {
  border-color: color-mix(in srgb, var(--green) 40%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.review-self-mark-btn[data-self-mark="partial"].is-active {
  border-color: color-mix(in srgb, var(--orange) 40%, transparent);
  background: var(--orange-soft);
  color: var(--orange);
}

.review-self-mark-btn[data-self-mark="wrong"].is-active {
  border-color: color-mix(in srgb, var(--unit-u4) 40%, transparent);
  background: var(--unit-u4-soft);
  color: var(--unit-u4);
}

.review-self-mark.is-frozen {
  pointer-events: none;
  opacity: 0.92;
}

.review-self-mark.is-frozen .review-self-mark-btn {
  cursor: default;
}

.review-self-mark.is-frozen .review-self-mark-btn:hover {
  border-color: var(--line);
  color: var(--muted);
}

.review-self-mark.is-frozen .review-self-mark-btn.is-active:hover {
  border-color: inherit;
  color: inherit;
}

.review-self-mark.is-frozen .review-self-mark-btn:not(.is-active) {
  opacity: 0.55;
}

.review-ms {
  border: 0;
  background: transparent;
}

.review-ms > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  list-style: none;
}

.review-ms > summary::-webkit-details-marker,
.review-ms > summary::marker {
  display: none;
  content: "";
}

.review-ms > summary::before {
  color: var(--muted);
  content: "\25B6";
  font-size: 9px;
}

.review-ms[open] > summary::before {
  content: "\25BC";
}

.review-ms-body {
  padding-top: 8px;
}

@media (max-width: 560px) {
  .review-history-item > summary {
    grid-template-columns: auto 3.25rem minmax(0, 1fr);
  }

  .review-history-item-actions {
    grid-column: 2 / -1;
    justify-content: flex-start;
  }

  .review-history-questions .question-summary {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .review-question-layout {
    grid-template-columns: 1fr;
  }
}

.basket-main-panel,
.basket-side-panel {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--soft-shadow);
}

.basket-main-panel {
  min-height: 360px;
  padding: var(--panel-pad);
}

.basket-side-panel {
  position: sticky;
  top: 24px;
  padding: 28px;
}

.basket-side-panel h2 {
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 28px;
  font-weight: 900;
}

.basket-help {
  margin-bottom: 22px;
  color: var(--muted);
  line-height: 1.75;
}

.basket-list {
  display: grid;
  gap: 14px;
}

.basket-item {
  display: grid;
  grid-template-columns: 48px 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 18px;
  box-shadow: var(--soft-shadow);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.basket-item:hover {
  border-color: #cacff1;
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.basket-item.is-dragging {
  opacity: 0.62;
}

.basket-item-order {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  background: var(--purple-soft);
  color: var(--purple);
  font-size: 18px;
  font-weight: 900;
}

.basket-item-drag-handle {
  color: #9aa6c5;
  cursor: grab;
  font-weight: 900;
}

.basket-item-main h3 {
  margin: 0 0 6px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
}

.basket-item-main p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.basket-item-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.basket-item-actions .ghost-btn {
  min-height: 38px;
  padding: 0 16px;
}

.basket-actions {
  display: grid;
  gap: 12px;
}

.basket-actions .primary-btn,
.basket-actions .ghost-btn {
  width: 100%;
}

.status-text {
  min-height: 22px;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
  white-space: pre-line;
}

.basket-question-type-tag {
  display: inline-flex;
  border-radius: 999px;
  background: var(--orange-soft);
  padding: 5px 9px;
  color: var(--orange);
  font-size: 12px;
  font-weight: 900;
}

.basket-item-title-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.review-network-panel {
  display: block;
  margin: 0 0 var(--section-gap);
  border: 0;
  background: transparent;
  padding: 0;
  box-shadow: none;
}

.review-network-panel .section-copy h2 {
  margin: 8px 0 14px;
  color: var(--ink);
  font-size: 32px;
  font-weight: 900;
}

.review-network-panel .section-copy p:last-child {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.review-network-map {
  position: relative;
  min-height: 256px;
  overflow: hidden;
  border: 1px solid #dfe5f7;
  border-radius: 12px;
  background:
    linear-gradient(90deg, rgba(89, 43, 231, 0.05) 1px, transparent 1px),
    linear-gradient(0deg, rgba(89, 43, 231, 0.05) 1px, transparent 1px),
    #fbfcff;
  background-size: 34px 34px;
}

.network-node {
  position: absolute;
  z-index: 2;
  display: grid;
  min-width: 96px;
  min-height: 46px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: #fff;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 900;
  box-shadow: 0 14px 26px rgba(39, 47, 109, 0.1);
}

.node-core {
  left: 50%;
  top: 50%;
  color: var(--purple);
  transform: translate(-50%, -50%);
}

.node-good {
  left: 12%;
  top: 24%;
  color: var(--green);
}

.node-watch {
  right: 10%;
  top: 18%;
  color: var(--orange);
}

.node-next {
  right: 21%;
  bottom: 18%;
  color: var(--blue);
}

.network-link {
  position: absolute;
  z-index: 1;
  height: 2px;
  border-radius: 999px;
  background: rgba(89, 43, 231, 0.22);
  transform-origin: left center;
}

.link-a {
  left: 29%;
  top: 42%;
  width: 140px;
  transform: rotate(15deg);
}

.link-b {
  left: 53%;
  top: 47%;
  width: 130px;
  transform: rotate(-22deg);
}

.link-c {
  left: 55%;
  top: 58%;
  width: 108px;
  transform: rotate(28deg);
}

.review-network-stats {
  display: grid;
  gap: 14px;
}

.review-network-stats article {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.92);
  padding: 18px 18px 18px 20px;
}

.review-network-stats span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.review-network-stats strong {
  display: block;
  margin: 8px 0 6px;
  color: var(--ink);
  font-size: 24px;
  font-weight: 900;
}

.review-network-stats p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.practice-basket-float {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: 80;
  display: inline-grid;
  grid-template-columns: 44px auto 32px;
  min-height: 58px;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(143, 120, 236, 0.42);
  border-radius: 999px;
  background: linear-gradient(135deg, var(--purple), var(--purple-dark));
  padding: 7px 10px 7px 8px;
  color: #fff;
  box-shadow: 0 18px 34px rgba(67, 25, 169, 0.28);
}

.basket-float-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.16);
  color: currentColor;
}

.basket-float-icon svg {
  display: block;
}

.basket-float-label {
  font-size: 15px;
  font-weight: 900;
  white-space: nowrap;
}

.practice-basket-float strong {
  display: grid;
  min-width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  color: var(--purple);
  font-size: 15px;
  font-weight: 900;
}

.practice-basket-float.is-empty {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.96);
  color: var(--ink);
  box-shadow: var(--soft-shadow);
}

.practice-basket-float.is-empty .basket-float-icon {
  background: var(--purple-soft);
  color: var(--purple);
}

.practice-basket-float.is-empty strong {
  background: var(--purple-soft);
}

.hero-formula-lines {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.hero-formula-lines b,
.hero-formula-lines span {
  display: inline-flex;
  width: max-content;
  border-radius: 999px;
  padding: 7px 12px;
  font-weight: 900;
}

.hero-formula-lines b {
  background: var(--green-soft);
  color: var(--green);
}

.hero-formula-lines span {
  background: var(--purple-soft);
  color: var(--purple);
}

.formula-preview-card .question-lines {
  margin-top: 16px;
}

.practice-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 20px 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.practice-summary-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.practice-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 12px 16px;
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

.practice-filter-field {
  display: grid;
  gap: 6px;
  min-width: 140px;
  flex: 1 1 140px;
}

.practice-filter-field span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.practice-filter-field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  font: inherit;
  font-weight: 700;
}

.question-stack {
  display: grid;
  gap: 14px;
  width: 100%;
}

.question-load-more-wrap {
  display: flex;
  justify-content: center;
  padding: 4px 0 12px;
}

.question-load-more {
  min-width: 180px;
}

.question-stack .question-card,
.question-card.has-basket-action {
  width: 100%;
  max-width: none;
  padding: 0;
  top: auto;
  left: auto;
  right: auto;
  position: relative;
  z-index: auto;
}

.question-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  box-shadow: var(--soft-shadow);
}

.question-card.open {
  border-color: #cacff1;
  box-shadow: var(--shadow);
}

.question-summary {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(180px, auto) auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  border: 0;
  background: #fff;
  padding: 18px 20px;
  color: inherit;
  text-align: left;
}

.question-card.has-basket-action .question-summary {
  grid-template-columns: minmax(200px, 1fr) minmax(140px, auto) auto;
}

.question-summary-actions {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  justify-self: end;
}

.basket-question-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--soft);
  padding: 8px 12px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: var(--soft-shadow);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

.basket-question-btn:hover {
  border-color: #c2d7ff;
  background: var(--blue-soft);
  color: var(--blue);
  transform: translateY(-1px);
}

.basket-question-btn.is-added {
  border-color: color-mix(in srgb, var(--green) 28%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.question-summary-actions .question-card-basket-btn,
.question-summary-actions .basket-question-btn {
  position: static;
  top: auto;
  right: auto;
  transform: none;
}

.question-summary-actions .question-card-basket-btn:hover,
.question-summary-actions .basket-question-btn:hover {
  transform: translateY(-1px);
}

.question-main-label {
  color: var(--ink);
  font-size: 16px;
  font-weight: 900;
}

.question-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.question-tags span {
  display: inline-flex;
  border-radius: 999px;
  background: var(--soft);
  padding: 5px 9px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.question-tags span.difficulty-tag {
  border: 1px solid rgba(75, 85, 99, 0.16);
  background: #f3f4f6;
  color: #4b5563;
}

.question-tags span.difficulty-easy {
  border-color: rgba(22, 163, 74, 0.24);
  background: #ecfdf3;
  color: #15803d;
}

.question-tags span.difficulty-medium {
  border-color: rgba(217, 119, 6, 0.24);
  background: #fff7ed;
  color: #b45309;
}

.question-tags span.difficulty-hard,
.question-tags span.difficulty-very_hard {
  border-color: rgba(220, 38, 38, 0.22);
  background: #fef2f2;
  color: #b91c1c;
}

.expand-indicator {
  border-radius: 999px;
  background: var(--purple-soft);
  padding: 7px 12px;
  color: var(--purple);
  font-weight: 900;
}

.question-body {
  border-top: 1px solid var(--line);
  padding: 22px 24px 24px;
  background: linear-gradient(180deg, rgba(248, 250, 253, 0.9), rgba(255, 255, 255, 0.98));
}

.question-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.34fr);
  gap: clamp(14px, 2vw, 22px);
  align-items: start;
}

.teacher-question-detail-grid {
  grid-template-columns: minmax(0, 1fr);
}

.detail-main,
.detail-side {
  display: grid;
  gap: 16px;
}

.detail-block {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  padding: 16px 18px 18px;
  box-shadow: var(--soft-shadow);
}

.detail-block h3 {
  margin: 0 0 12px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.foldout-block {
  padding: 0;
  overflow: hidden;
}

.foldout-block summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.02em;
  list-style: none;
}

.foldout-block summary::-webkit-details-marker {
  display: none;
}

.foldout-block summary::marker {
  content: "";
}

.foldout-block summary::before {
  color: var(--muted);
  content: "\25B6";
  font-size: 12px;
}

.foldout-block[open] summary::before {
  content: "\25BC";
}

.foldout-block summary strong {
  border-radius: 999px;
  background: var(--soft);
  padding: 7px 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

.foldout-block[open] summary {
  border-bottom: 1px solid var(--line);
}

.foldout-block[open] summary strong {
  background: var(--purple-soft);
  color: var(--purple);
  font-size: 0;
}

.foldout-block[open] summary strong::before {
  content: "收起";
  font-size: 12px;
}

.foldout-block > .empty-box,
.foldout-block > .mark-scheme-content,
.foldout-block > .loading-card,
.foldout-block > .media-panel-body,
.media-panel .media-panel-body {
  margin: 0;
  padding: 16px 18px 18px;
}

.media-panel {
  overflow: hidden;
}

.media-panel-body {
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line);
  background: #fff;
}

.media-panel-body > .media-placeholder,
.media-panel-body > .empty-box,
.media-panel-body > .loading-card {
  margin: 0;
}

.question-images,
.mark-scheme-entry,
.mark-scheme-images {
  display: grid;
  gap: 12px;
}

.question-images {
  min-height: 180px;
}

.detail-block img,
.question-body img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.detail-block img[data-authenticated-media-src]:not([data-authenticated-media-ready]),
.question-body img[data-authenticated-media-src]:not([data-authenticated-media-ready]),
.detail-block img.media-error,
.detail-block img.media-forbidden,
.question-body img.media-error,
.question-body img.media-forbidden {
  display: none;
}

.authenticated-media-notice {
  margin: 8px 0;
  color: #64748b;
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

.mark-scheme-meta {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.detail-side .detail-block:first-child {
  min-height: 180px;
}

.detail-side .detail-block:last-child {
  min-height: 140px;
  background: linear-gradient(180deg, #ffffff 0%, var(--soft) 100%);
}

.mastery-choice-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mastery-choice-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  padding: 0 14px;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.mastery-choice-btn:hover {
  border-color: #c2d7ff;
  color: var(--blue);
}

.mastery-choice-btn[data-mastery="unfamiliar"].is-active {
  border-color: color-mix(in srgb, var(--unit-u4) 42%, transparent);
  background: var(--unit-u4-soft);
  color: var(--unit-u4);
}

.mastery-choice-btn[data-mastery="partial"].is-active {
  border-color: color-mix(in srgb, var(--orange) 42%, transparent);
  background: var(--orange-soft);
  color: var(--orange);
}

.mastery-choice-btn[data-mastery="mastered"].is-active {
  border-color: color-mix(in srgb, var(--green) 42%, transparent);
  background: var(--green-soft);
  color: var(--green);
}

.mastery-choice-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.answer-status,
.hint-text {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.hint-text {
  margin-top: 0;
}

.mastery-action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.reset-answer-btn {
  border: 1px solid color-mix(in srgb, var(--muted) 26%, transparent);
  border-radius: 10px;
  background: #fff;
  color: var(--muted);
  padding: 10px 14px;
  font-weight: 900;
  cursor: pointer;
}

.reset-answer-btn:hover {
  border-color: color-mix(in srgb, var(--orange) 36%, transparent);
  color: var(--orange);
  background: var(--orange-soft);
}

.ai-score-entry-title {
  display: flex;
  align-items: baseline;
  gap: 9px;
  color: var(--ink);
}

.ai-score-entry-title span {
  color: var(--purple);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ai-score-entry-title strong { font-size: 14px; }

.ai-image-rotate-overlay {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(7, 20, 53, 0.5);
}

.ai-image-rotate-dialog {
  width: min(560px, 100%);
  max-height: calc(100vh - 40px);
  overflow: auto;
  padding: 20px;
  border-radius: 18px;
  background: #fff;
  box-shadow: 0 18px 56px rgba(7, 20, 53, 0.24);
}

.ai-image-rotate-dialog h3 { margin: 0; color: var(--ink); }
.ai-image-rotate-dialog p { margin: 8px 0 14px; color: var(--muted); font-size: 13px; }
.ai-image-rotate-preview { display: grid; place-items: center; min-height: 240px; overflow: hidden; border-radius: 12px; background: var(--paper); }
.ai-image-rotate-preview img { display: block; max-width: min(100%, 420px); max-height: 360px; object-fit: contain; transition: transform 180ms ease; }
.ai-image-rotate-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.ai-score-preview {
  margin-top: 12px;
  padding: 14px;
  border: 1px solid color-mix(in srgb, var(--purple) 34%, transparent);
  border-radius: 12px;
  background: color-mix(in srgb, var(--purple-soft) 48%, white);
}

.ai-score-preview-head,
.ai-score-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.ai-score-preview-head span {
  color: var(--purple);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.ai-score-preview-head strong {
  color: var(--ink);
  font-size: 18px;
}

.ai-score-feedback,
.ai-score-error {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.6;
}

.ai-score-error { color: var(--orange); }

.ai-score-points {
  display: grid;
  gap: 6px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.ai-score-points li {
  display: flex;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
}

.ai-score-points .is-awarded { background: color-mix(in srgb, var(--green) 12%, white); }
.ai-score-points .is-missing { background: color-mix(in srgb, var(--orange) 10%, white); }
.ai-score-points strong { min-width: 28px; color: var(--ink); }
.ai-score-points span { color: var(--muted); line-height: 1.45; }
.ai-score-actions { margin-top: 14px; justify-content: flex-start; }

@media (max-width: 520px) {
  .ai-score-preview-head,
  .ai-score-actions { align-items: flex-start; flex-direction: column; }
}

.answer-image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 10px;
}

.review-attempt-body {
  display: grid;
  gap: 12px;
  padding: 0 18px 18px;
}

.review-attempt-choice,
.review-attempt-text {
  border: 1px solid color-mix(in srgb, var(--muted) 18%, transparent);
  border-radius: 10px;
  background: color-mix(in srgb, var(--paper) 88%, white);
  padding: 12px;
  color: var(--ink);
  line-height: 1.65;
  white-space: pre-wrap;
}

.review-attempt-choice {
  display: inline-flex;
  width: fit-content;
  min-width: 108px;
  font-weight: 900;
}

.review-attempt-files {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.answer-image-card {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
}

.answer-image-card img {
  aspect-ratio: 1;
  object-fit: cover;
}

.answer-file-card {
  min-height: 120px;
  display: grid;
  align-content: space-between;
}

.answer-file-pill {
  display: grid;
  place-items: center;
  min-height: 76px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--purple) 10%, white);
  color: var(--ink);
  font-weight: 900;
  text-align: center;
  padding: 10px;
  overflow-wrap: anywhere;
}

.answer-image-card button {
  width: 100%;
  border: 0;
  border-top: 1px solid var(--line);
  background: var(--soft);
  padding: 8px;
  color: var(--muted);
  font-weight: 800;
  cursor: pointer;
}

.answer-image-card button:hover {
  background: var(--orange-soft);
  color: var(--orange);
}

.question-loading,
.empty-box,
.loading-card {
  border-radius: 10px;
  background: var(--soft);
  padding: 18px;
  color: var(--muted);
  line-height: 1.55;
}

.media-placeholder {
  display: grid;
  gap: 14px;
  border: 1px dashed color-mix(in srgb, var(--purple) 24%, var(--line));
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(245, 247, 255, 0.98));
  padding: 16px;
}

.media-placeholder-frame {
  position: relative;
  overflow: hidden;
  min-height: 168px;
  border-radius: 12px;
  background: linear-gradient(135deg, #eef2ff 0%, #f7f8ff 48%, #edf7f2 100%);
}

.media-placeholder-shimmer {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    transparent 0%,
    rgba(255, 255, 255, 0.18) 35%,
    rgba(255, 255, 255, 0.72) 50%,
    rgba(255, 255, 255, 0.18) 65%,
    transparent 100%
  );
  transform: translateX(-120%);
  animation: media-placeholder-shimmer 1.6s ease-in-out infinite;
}

.media-placeholder-pulse {
  position: absolute;
  inset: 18px;
  border-radius: 10px;
  border: 1px solid rgba(89, 43, 231, 0.12);
  background:
    linear-gradient(90deg, rgba(73, 111, 244, 0.1), rgba(89, 43, 231, 0.08) 50%, rgba(18, 185, 129, 0.1));
  opacity: 0.75;
  animation: media-placeholder-pulse 1.8s ease-in-out infinite;
}

.media-placeholder-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.media-placeholder-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid color-mix(in srgb, var(--purple) 25%, transparent);
  border-top-color: var(--purple);
  border-radius: 50%;
  animation: media-placeholder-spin 0.8s linear infinite;
}

@keyframes media-placeholder-shimmer {
  100% {
    transform: translateX(120%);
  }
}

@keyframes media-placeholder-pulse {
  0%,
  100% {
    opacity: 0.45;
    transform: scale(0.985);
  }
  50% {
    opacity: 0.9;
    transform: scale(1);
  }
}

@keyframes media-placeholder-spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1180px) {
  .date-filter-panel,
  .topic-filter-panel,
  .formula-filter-panel {
    flex-wrap: wrap;
  }

  .date-filter-panel .field,
  .topic-filter-panel .field,
  .formula-filter-panel .field {
    flex: 1 1 160px;
  }

  .date-filter-panel .unit-strip,
  .topic-filter-panel .unit-strip,
  .formula-filter-panel .unit-strip {
    flex: 0 0 100%;
    width: 100%;
    max-width: 100%;
    margin-left: 0;
    justify-content: flex-end;
  }

  .paper-card-grid,
  .topic-grid,
  .formula-grid,
  .formula-board .formula-grid,
  .question-detail-grid {
    grid-template-columns: 1fr;
  }

  .formula-board .formula-card {
    gap: 16px;
  }
}

@media (max-width: 1100px) {
  .review-network-panel .section-copy {
    max-width: none;
  }
}

@media (max-width: 680px) {
  .review-question-layout {
    grid-template-columns: 1fr;
  }

  .date-board,
  .date-practice-view,
  .topic-board,
  .topic-practice-view,
  .formula-board,
  .formula-practice-view {
    padding: var(--panel-pad);
  }

  .paper-card,
  .topic-card {
    padding: 18px 16px;
    gap: 14px;
  }

  .formula-board .formula-card {
    flex-wrap: wrap;
    padding: 18px 16px;
    gap: 14px;
  }

  .formula-board .formula-card .formula-image {
    width: 100%;
  }

  .practice-head {
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
  }

  .practice-head-aside {
    align-items: center;
    flex-wrap: nowrap;
  }

  .practice-summary {
    align-items: stretch;
    flex-direction: column;
  }

  .formula-practice-view .selected-formula-image {
    width: 200px;
  }

  .basket-shell {
    grid-template-columns: 1fr;
  }

  .basket-side-panel {
    position: static;
  }

  .basket-item {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .basket-item-drag-handle {
    display: none;
  }

  .basket-item-actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
  }

  .practice-basket-float {
    right: 14px;
    bottom: 14px;
    grid-template-columns: 40px auto 30px;
    min-height: 52px;
    padding: 6px 8px 6px 7px;
  }

  .basket-float-icon {
    width: 40px;
    height: 40px;
  }

  .practice-basket-float strong {
    min-width: 30px;
    height: 30px;
  }

  .question-summary {
    grid-template-columns: 1fr;
  }

  .question-tags {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .practice-head {
    flex-direction: column;
    align-items: stretch;
  }

  .practice-head-aside {
    align-items: stretch;
  }

  .formula-practice-view .selected-formula-image {
    width: 100%;
  }

  .practice-summary-actions {
    width: 100%;
    justify-content: space-between;
  }
}

.login-page {
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% 22%, rgba(89, 43, 231, 0.22), transparent 32%),
    radial-gradient(circle at 82% 18%, rgba(38, 169, 108, 0.16), transparent 28%),
    radial-gradient(circle at 74% 78%, rgba(73, 111, 244, 0.18), transparent 34%),
    linear-gradient(180deg, #f7f5ff 0%, #eef3ff 48%, #f8faff 100%);
}

.login-shell {
  display: grid;
  min-height: calc(100vh - 86px);
  place-items: center;
  padding: 32px var(--shell-gutter) 64px;
}

.login-shell > main {
  width: min(100%, 456px);
}

.login-shell > main .login-card {
  width: 100%;
  box-sizing: border-box;
}

.login-card {
  width: min(100%, 400px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(39, 47, 109, 0.12);
  padding: 32px 28px 28px;
}

.login-card h1 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 28px;
  font-weight: 900;
}

.login-copy {
  margin: 0 0 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.login-form {
  display: grid;
  gap: 16px;
}

.login-status {
  min-height: 20px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.login-status.is-error {
  color: #c2410c;
}

.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: grid;
  place-items: center;
  padding: 32px var(--shell-gutter);
  background:
    radial-gradient(circle at 12% 28%, rgba(196, 181, 253, 0.38), transparent 42%),
    radial-gradient(circle at 88% 22%, rgba(167, 243, 208, 0.22), transparent 36%),
    radial-gradient(circle at 78% 82%, rgba(196, 181, 253, 0.32), transparent 44%),
    rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(18px) saturate(1.25);
  -webkit-backdrop-filter: blur(18px) saturate(1.25);
}

.login-overlay .field input,
.login-page .field input {
  background: rgba(255, 255, 255, 0.72);
}

.login-submit {
  width: 100%;
  margin-top: 8px;
}

.privacy-consent {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
  cursor: pointer;
}

.privacy-consent input {
  margin-top: 3px;
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  accent-color: var(--purple, #592be7);
}

.privacy-consent a {
  color: var(--purple, #592be7);
  font-weight: 700;
  text-decoration: none;
}

.privacy-consent a:hover {
  text-decoration: underline;
}

.privacy-shell {
  align-items: start;
}

.privacy-card {
  width: min(100%, 760px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 18px 48px rgba(39, 47, 109, 0.12);
  padding: 32px 32px 28px;
}

.privacy-card h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 900;
}

.privacy-meta {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
}

.privacy-card h2 {
  margin: 22px 0 8px;
  font-size: 17px;
  font-weight: 800;
}

.privacy-card p,
.privacy-card li {
  color: var(--ink);
  font-size: 15px;
  line-height: 1.7;
}

.privacy-card ul {
  margin: 0 0 12px;
  padding-left: 1.2em;
}

.privacy-note {
  margin-top: 18px;
  color: var(--muted) !important;
  font-size: 13px !important;
}

.privacy-actions {
  margin: 24px 0 0;
}

.privacy-actions .primary-btn {
  display: inline-flex;
}

.site-footer {
  padding: 18px var(--shell-gutter) 28px;
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.7;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--purple);
  text-decoration: underline;
}