:root {
  --ink: #24324a;
  --muted: #5e6b7c;
  --purple: #7865b5;
  --purple-soft: #eee9ff;
  --blue: #4f83b7;
  --blue-soft: #e7f4ff;
  --surface: #ffffff;
  --line: #d9d9eb;
  --shadow: 0 12px 30px rgba(69, 74, 120, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(135deg, #faf8ff 0%, #f2f9ff 52%, #ffffff 100%);
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  font-size: 18px;
  line-height: 1.75;
}

a { color: #385f9a; }

.wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.hero {
  padding: 72px 0 50px;
  background:
    radial-gradient(circle at 85% 20%, rgba(168, 206, 255, .55), transparent 30%),
    radial-gradient(circle at 15% 15%, rgba(203, 185, 255, .55), transparent 34%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--purple);
  font-weight: 800;
  letter-spacing: .12em;
}

h1, h2, h3 { line-height: 1.3; }
h1 { margin: 0; font-size: clamp(2.25rem, 6vw, 4.5rem); letter-spacing: -.04em; }
h2 { margin: 0 0 20px; font-size: clamp(1.7rem, 3vw, 2.25rem); }
h3 { margin-top: 0; }

.lead {
  max-width: 760px;
  margin: 24px 0 32px;
  color: #48576c;
  font-size: 1.15rem;
}

.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.button {
  display: inline-block;
  padding: 11px 19px;
  border: 1px solid var(--purple);
  border-radius: 999px;
  background: var(--purple);
  color: white;
  font-weight: 700;
  text-decoration: none;
}

.button.secondary { background: white; color: var(--purple); }

main { padding: 32px 0 80px; }
section { padding: 34px 0; }

.stats, .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
}

.stat, .card, .notice, .workflow {
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, .88);
  box-shadow: var(--shadow);
}

.stat { padding: 22px; }
.stat strong { display: block; color: var(--purple); font-size: 2rem; }
.card { padding: 24px; }
.card:nth-child(even) { background: rgba(239, 248, 255, .9); }

.tag {
  display: inline-block;
  margin: 0 6px 6px 0;
  padding: 3px 10px;
  border-radius: 99px;
  background: var(--purple-soft);
  color: #594890;
  font-size: .88rem;
  font-weight: 700;
}

.meta { color: var(--muted); font-size: .94rem; }
.notice { padding: 22px 24px; border-left: 7px solid #9a86d7; }
.workflow { padding: 24px; background: linear-gradient(100deg, var(--purple-soft), var(--blue-soft)); }
.workflow ol { margin-bottom: 0; }

.home-page .hero h1 {
  white-space: nowrap;
  font-size: clamp(1.75rem, 5vw, 3.6rem);
  letter-spacing: -.055em;
}

.home-page .overview-section {
  padding: 24px 0;
}

.home-page .stats {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.home-page .stat {
  padding: 14px 18px;
  border-radius: 16px;
  text-align: center;
}

.home-page .stat strong {
  font-size: 1.55rem;
  line-height: 1.25;
}

.home-page .stat span {
  color: var(--muted);
  font-size: .9rem;
}

.home-page .subject-card,
.home-page .school-card {
  min-height: 210px;
  padding: 21px;
}

footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.lesson-hero {
  padding: 48px 0 36px;
  background: linear-gradient(120deg, var(--purple-soft), var(--blue-soft));
  border-bottom: 1px solid var(--line);
}

.lesson-hero .wrap > a:first-child {
  display: inline-flex;
  align-items: center;
  margin-bottom: 18px;
  padding: 8px 15px;
  border: 2px solid #6f75bd;
  border-radius: 10px;
  background: #eef3ff;
  color: #3e5598;
  font-weight: 800;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(65, 80, 145, .12);
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.lesson-hero .wrap > a:first-child:hover,
.lesson-hero .wrap > a:first-child:focus-visible {
  transform: translateY(-2px);
  border-color: #4f559d;
  background: #dfe8ff;
  color: #273a7a;
  outline: 3px solid rgba(111, 117, 189, .2);
  outline-offset: 2px;
}

.question-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.question-nav a {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: white;
  font-weight: 800;
  text-decoration: none;
}

.index-panel {
  overflow: hidden;
  border: 2px solid #c8c5de;
  border-radius: 20px;
  background: white;
  box-shadow: var(--shadow);
}

.year-selector {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 17px 20px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #f1ecff, #eef7ff);
}

.index-label {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 800;
}

.year-pill {
  padding: 7px 14px;
  border: 2px solid #7563b0;
  border-radius: 999px;
  background: #7563b0;
  color: white;
}

.index-note {
  margin-left: auto;
  color: var(--muted);
  font-size: .88rem;
}

.index-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.index-group {
  padding: 22px;
}

.index-group + .index-group {
  border-left: 1px solid var(--line);
}

.index-group-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.index-group-heading > span {
  display: grid;
  width: 45px;
  height: 45px;
  place-items: center;
  border-radius: 12px;
  color: white;
  font-size: .86rem;
  font-weight: 900;
}

.index-group-heading h3,
.index-group-heading p { margin: 0; }
.index-group-heading p { color: var(--muted); font-size: .88rem; }

.index-physical {
  background: #f7f3ff;
}

.index-physical .index-group-heading > span,
.index-physical .question-nav a {
  background: #7865b5;
  color: white;
  border-color: #7865b5;
}

.index-analytical {
  background: #f0f8ff;
}

.index-analytical .index-group-heading > span,
.index-analytical .question-nav a {
  background: #4f83b7;
  color: white;
  border-color: #4f83b7;
}

.index-group .question-nav a:hover,
.index-group .question-nav a:focus-visible {
  transform: translateY(-2px);
  filter: brightness(.88);
  outline: 3px solid rgba(80, 100, 160, .18);
  outline-offset: 2px;
}

.question-list { display: grid; gap: 28px; }

.subject-divider {
  padding: 26px 28px;
  border: 2px solid #74a6ca;
  border-left: 9px solid #4f83b7;
  border-radius: 18px;
  background: linear-gradient(120deg, #e5f4ff, #f3efff);
}

.subject-divider span {
  color: #4f6fa7;
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .14em;
}

.subject-divider h2 { margin: 5px 0; color: #345c85; }
.subject-divider p { margin: 0; color: var(--muted); }

.source-page-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.source-page-grid a {
  padding: 8px;
  border: 2px solid #d8b2bf;
  border-radius: 16px;
  background: #fff5f8;
  box-shadow: var(--shadow);
}

.source-page-grid img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 9px;
}

.organic-nav a {
  background: #b85f7b;
  color: white;
  border-color: #b85f7b;
}

.index-organic {
  background: #fff3f6;
}

.index-organic .index-group-heading > span {
  background: #b85f7b;
}

.index-inorganic {
  background: #eef9f1;
}

.index-inorganic .index-group-heading > span,
.inorganic-nav a {
  background: #4f8c67;
  color: white;
  border-color: #4f8c67;
}

.question-source-image {
  display: block;
  margin: 18px 0;
  padding: 8px;
  border: 2px solid var(--line);
  border-radius: 16px;
  background: white;
}

.question-source-image img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 9px;
}

.question-card {
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, .94);
  box-shadow: var(--shadow);
  scroll-margin-top: 20px;
}

.question-card section {
  padding: 18px 0;
  border-top: 1px solid #e9e7f2;
}

.question-card img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1rem auto;
  border-radius: 12px;
}

.choices {
  padding-left: 1.4rem;
  list-style: none;
}

.alert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.alert-grid > :only-child { grid-column: 1 / -1; }

.exam-alert {
  padding: 16px 18px;
  border: 1px solid #efb2b2;
  border-left: 7px solid #c93d4a;
  border-radius: 14px;
  background: #fff0f1;
  color: #77212a;
}

.exam-alert strong {
  display: block;
  margin-bottom: 4px;
  color: #a51f2d;
  font-size: 1.02rem;
}

.exam-alert p { margin: 0; }

.loss-alert {
  padding: 16px 18px;
  border: 1px solid #efce91;
  border-left: 7px solid #dc8a16;
  border-radius: 14px;
  background: #fff8e8;
  color: #70460f;
}

.loss-alert strong {
  display: block;
  margin-bottom: 4px;
  color: #a85e00;
  font-size: 1.02rem;
}

.loss-alert p { margin: 0; }

.answer-box {
  padding: 15px 18px !important;
  border: 0 !important;
  border-radius: 14px;
  background: var(--blue-soft);
}

.concept-box {
  margin: 8px 0;
  padding: 20px 22px !important;
  border: 1px solid #cfc2f5 !important;
  border-left: 7px solid #8872c5 !important;
  border-radius: 16px;
  background: #f3efff;
}

.concept-box h3 { color: #59448f; }

.extension {
  margin-top: 12px;
  padding: 22px !important;
  border: 1px solid #b9dcf5 !important;
  border-left: 7px solid #5c94c6 !important;
  border-radius: 16px;
  background: #edf8ff;
}

.extension > h3 { color: #356d9c; }

.extension-concept {
  margin: 16px 0;
  padding: 14px 17px;
  border-radius: 12px;
  background: #dfefff;
}

.extension h4 { margin: 0 0 6px; color: #315f88; font-size: 1.05rem; }

.extension details {
  padding: 12px 15px;
  border: 1px solid #a8cfe9;
  border-radius: 12px;
  background: white;
}

.extension summary {
  color: #315f88;
  font-weight: 800;
  cursor: pointer;
}

.extension-solution { padding-top: 14px; }

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.back-top { display: inline-block; margin-top: 14px; }

.section-heading {
  max-width: 760px;
  margin-bottom: 24px;
}

.section-heading h2 { margin-bottom: 8px; }
.section-heading p:last-child { margin: 0; color: var(--muted); }

.section-kicker {
  margin: 0 0 4px;
  color: var(--purple);
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .16em;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}

.subject-card, .school-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 260px;
  padding: 25px;
  overflow: hidden;
  border: 2px solid var(--line);
  border-radius: 22px;
  color: var(--ink);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.subject-card h3 {
  margin: 10px 0 7px;
  font-size: 1.65rem;
}

.subject-code, .school-code {
  align-self: flex-start;
  padding: 5px 11px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .72);
  font-size: .86rem;
  font-weight: 900;
  letter-spacing: .12em;
}

.subject-metrics {
  display: flex;
  gap: 18px;
  margin: auto 0 16px;
  padding-top: 18px;
}

.subject-metrics span { color: var(--muted); }
.subject-metrics strong { color: var(--ink); font-size: 1.25rem; }

.card-status {
  display: block;
  padding-top: 12px;
  border-top: 1px solid rgba(50, 55, 85, .16);
  font-weight: 800;
}

.subject-ac { background: #f1ecff; border-color: #a892d9; }
.subject-oc { background: #fff0f4; border-color: #e5a3b7; }
.subject-pc { background: #e9f5ff; border-color: #75acd4; }
.subject-ic { background: #edf8f0; border-color: #8ec3a0; }
.subject-ec { background: #fff8df; border-color: #d9bd64; }

.is-clickable {
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.is-clickable:hover,
.is-clickable:focus-visible {
  transform: translateY(-5px);
  border-color: #5b4a9a;
  box-shadow: 0 18px 38px rgba(69, 74, 120, .2);
  outline: 3px solid rgba(120, 101, 181, .18);
  outline-offset: 3px;
}

.is-pending { opacity: .82; box-shadow: none; }
.is-pending .card-status { color: #6d6d78; }

.school-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 18px;
}

.school-card {
  min-height: 225px;
  background: linear-gradient(135deg, #ffffff, #edf4ff);
  border-color: #a9bedc;
}

.school-heading {
  display: flex;
  align-items: center;
  gap: 13px;
}

.school-heading h3 { margin: 0; font-size: 1.4rem; }
.school-years { color: var(--muted); }
.school-card .card-status { margin-top: auto; }

.school-subject-links {
  display: grid;
  gap: 10px;
  margin: 4px 0 18px;
}

.school-subject-link {
  display: block;
  padding: 11px 14px;
  border: 2px solid #91a9d0;
  border-radius: 12px;
  background: #fff;
  color: #342c67;
  font-weight: 800;
  line-height: 1.45;
  text-decoration: none;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.school-subject-link:hover,
.school-subject-link:focus-visible {
  transform: translateY(-2px);
  border-color: #5b4a9a;
  background: #f2efff;
  outline: 3px solid rgba(120, 101, 181, .18);
  outline-offset: 2px;
}

.school-subject-link.is-disabled {
  border-color: var(--line);
  color: var(--muted);
  cursor: default;
}

.school-analysis {
  margin: 4px 0 22px;
  padding: 18px;
  border: 1px solid #c8d5e8;
  border-radius: 17px;
  background: rgba(255, 255, 255, .82);
}

.analysis-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.analysis-heading h4 {
  margin: 0;
  font-size: 1.15rem;
}

.analysis-heading span {
  color: var(--muted);
  font-size: .82rem;
  text-align: right;
}

.analysis-visual {
  display: grid;
  grid-template-columns: 142px minmax(0, 1fr);
  align-items: center;
  gap: 18px;
}

.analysis-charts {
  display: grid;
  gap: 18px;
}

.analysis-chart {
  padding: 15px;
  border: 1px solid #d7dfec;
  border-radius: 14px;
  background: rgba(246, 249, 255, .88);
}

.chart-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 13px;
}

.chart-heading h5 {
  margin: 0;
  color: #342c67;
  font-size: .98rem;
}

.chart-heading span {
  color: var(--muted);
  font-size: .78rem;
  text-align: right;
}

.pie-chart {
  position: relative;
  isolation: isolate;
  display: grid;
  width: 142px;
  aspect-ratio: 1;
  place-content: center;
  border-radius: 50%;
  background: var(--pie-fill);
  box-shadow: inset 0 0 0 2px rgba(50, 55, 85, .12), 0 8px 20px rgba(69, 74, 120, .14);
}

.pie-chart::before {
  content: "";
  position: absolute;
  inset: 30px;
  z-index: -1;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(50, 55, 85, .1);
}

.pie-chart strong,
.pie-chart span {
  display: block;
  text-align: center;
}

.pie-chart strong {
  font-size: 1.45rem;
  line-height: 1.1;
}

.pie-chart span {
  color: var(--muted);
  font-size: .78rem;
}

.pie-legend,
.analysis-focus {
  margin: 0;
}

.pie-legend {
  display: grid;
  gap: 7px;
  padding: 0;
  list-style: none;
}

.pie-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  font-size: .86rem;
  line-height: 1.35;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 4px;
  background: var(--legend-color);
}

.pie-legend strong {
  color: #40356f;
  font-variant-numeric: tabular-nums;
}

.analysis-focus {
  padding-left: 1.25em;
  margin-top: 16px;
  font-size: .9rem;
}

.analysis-focus li + li {
  margin-top: 5px;
}

.analysis-note {
  margin: 13px 0 0;
  padding-top: 11px;
  border-top: 1px dashed #bdc9dc;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.5;
}

.paper-analysis {
  padding: clamp(22px, 4vw, 34px);
  border: 2px solid #b9c8e3;
  border-radius: 22px;
  background: linear-gradient(135deg, #f5f1ff, #eef8ff 58%, #ffffff);
  box-shadow: var(--shadow);
}

.paper-analysis > header h2 {
  margin: 0 0 7px;
}

.paper-analysis > header p {
  margin: 0;
  color: var(--muted);
}

.paper-analysis-grid {
  display: grid;
  grid-template-columns: minmax(340px, .9fr) minmax(0, 1.1fr);
  gap: 26px;
  margin-top: 22px;
}

.exam-chart-panel,
.score-strategy {
  padding: 20px;
  border: 1px solid #ccd7e8;
  border-radius: 17px;
  background: rgba(255, 255, 255, .86);
}

.exam-chart-panel h3,
.score-strategy h3 {
  margin: 0 0 14px;
  font-size: 1.15rem;
}

.exam-chart-row {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  align-items: center;
  gap: 20px;
}

.exam-donut {
  position: relative;
  isolation: isolate;
  display: grid;
  width: 150px;
  aspect-ratio: 1;
  place-content: center;
  border-radius: 50%;
  background: var(--exam-pie);
  box-shadow: inset 0 0 0 2px rgba(50, 55, 85, .12), 0 8px 20px rgba(69, 74, 120, .14);
}

.exam-donut::before {
  content: "";
  position: absolute;
  inset: 32px;
  z-index: -1;
  border-radius: 50%;
  background: white;
}

.exam-donut strong,
.exam-donut span {
  display: block;
  text-align: center;
}

.exam-donut strong {
  font-size: 1.25rem;
}

.exam-donut span {
  color: var(--muted);
  font-size: .76rem;
}

.exam-legend {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.exam-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  font-size: .88rem;
  line-height: 1.35;
}

.exam-legend i {
  width: 12px;
  height: 12px;
  border-radius: 4px;
  background: var(--swatch);
}

.exam-legend strong {
  color: #40356f;
  font-variant-numeric: tabular-nums;
}

.score-strategy ol {
  margin: 0;
  padding-left: 1.4em;
}

.score-strategy li + li {
  margin-top: 10px;
}

.score-strategy strong {
  color: #3d3275;
}

.paper-analysis-note {
  margin: 16px 0 0;
  padding-top: 13px;
  border-top: 1px dashed #bdc9dc;
  color: var(--muted);
  font-size: .82rem;
}

@media (max-width: 600px) {
  body { font-size: 17px; }
  .wrap { width: min(100% - 24px, 1160px); }
  .hero { padding-top: 48px; }
  .two-column { grid-template-columns: 1fr; }
  .alert-grid { grid-template-columns: 1fr; }
  .subject-grid, .school-grid { grid-template-columns: 1fr; }
  .subject-card, .school-card { min-height: 0; }
  .analysis-heading { display: block; }
  .analysis-heading span { display: block; margin-top: 4px; text-align: left; }
  .chart-heading { display: block; }
  .chart-heading span { display: block; margin-top: 3px; text-align: left; }
  .analysis-visual { grid-template-columns: 112px minmax(0, 1fr); gap: 13px; }
  .pie-chart { width: 112px; }
  .pie-chart::before { inset: 24px; }
  .paper-analysis-grid { grid-template-columns: 1fr; }
  .exam-chart-row { grid-template-columns: 112px minmax(0, 1fr); gap: 14px; }
  .exam-donut { width: 112px; }
  .exam-donut::before { inset: 24px; }
  .index-groups { grid-template-columns: 1fr; }
  .index-group + .index-group {
    border-top: 1px solid var(--line);
    border-left: 0;
  }
  .index-note {
    width: 100%;
    margin-left: 0;
  }
  .source-page-grid { grid-template-columns: 1fr; }
  .home-page .hero h1 { font-size: clamp(1.55rem, 7.3vw, 2rem); }
  .home-page .stats { gap: 8px; }
  .home-page .stat { padding: 11px 6px; }
  .home-page .stat strong { font-size: 1.35rem; }
  .home-page .stat span { font-size: .76rem; }
}