:root {
  color-scheme: only light;
  --bg: #fbf6ee;
  --bg-soft: #fffaf3;
  --card: rgba(255, 251, 245, 0.96);
  --card-soft: rgba(255, 247, 234, 0.88);
  --card-strong: rgba(255, 244, 223, 0.95);
  --line: rgba(198, 157, 104, 0.18);
  --text: #2e241c;
  --muted: #7a6a5b;
  --accent: #d78b3f;
  --accent-strong: #be6e2e;
  --accent-soft: rgba(215, 139, 63, 0.12);
  --success: #4ea676;
  --danger: #d06c60;
  --shadow-lg: 0 30px 70px rgba(109, 79, 42, 0.10);
  --shadow-md: 0 16px 34px rgba(109, 79, 42, 0.08);
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 18px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(255, 224, 176, 0.68), transparent 0 34%),
    linear-gradient(180deg, #fff9f0 0%, #fbf6ee 100%);
  background-color: #fbf6ee;
  color: var(--text);
}

.page-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.page-stack,
.stack-md,
.stack-sm,
.stack-xs {
  display: grid;
}

.page-stack {
  gap: 28px;
}

.stack-md {
  gap: 20px;
}

.stack-sm {
  gap: 12px;
}

.stack-xs {
  gap: 6px;
}

.surface,
.morning-hero-card,
.daily-focus-card,
.subject-card,
.info-card,
.question-panel,
.sidebar-panel,
.quiz-topbar {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-md);
  border-radius: var(--radius-lg);
  color: var(--text);
}

.surface-soft {
  background: var(--card-soft);
  border: 1px solid rgba(198, 157, 104, 0.12);
  border-radius: var(--radius-md);
  padding: 18px;
}

.morning-hero-card {
  padding: 40px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.morning-hero-card::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -40px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(255, 214, 140, 0.45), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.9fr);
  gap: 28px;
  align-items: start;
}

.simple-hero {
  padding: 34px 36px;
}

.hero-pill,
.eyebrow,
.section-kicker,
.subject-tag,
.quiz-card-index,
.subject-block-title {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
}

.hero-pill {
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 219, 158, 0.45);
  color: var(--accent-strong);
}

.eyebrow,
.section-kicker,
.subject-tag,
.quiz-card-index,
.subject-block-title {
  color: var(--accent-strong);
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

.hero h1,
#quiz-title,
.morning-hero-card h1 {
  font-size: clamp(2.5rem, 5vw, 4.6rem);
  line-height: 1.04;
  max-width: 11ch;
}

.hero-copy,
.muted,
.hero-routine-item p,
.subject-main-copy p,
.quiz-card p,
.info-card p {
  color: var(--muted);
  line-height: 1.68;
}

.hero-copy {
  max-width: 62ch;
  font-size: 1.05rem;
}

.hero-actions,
.featured-actions,
.progress-row,
.chapter-list,
.badge-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-side-card {
  padding: 22px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 246, 230, 0.95) 0%, rgba(255, 251, 245, 0.98) 100%);
  border: 1px solid rgba(198, 157, 104, 0.16);
}

.hero-routine-list {
  display: grid;
  gap: 14px;
  margin-top: 16px;
}

.hero-routine-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 12px;
  align-items: start;
}

.hero-routine-item span {
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(215, 139, 63, 0.14);
  color: var(--accent-strong);
  font-weight: 800;
}

.button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
  color: #fffdf8;
  box-shadow: 0 14px 30px rgba(190, 110, 46, 0.22);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  color: var(--text);
  border: 1px solid var(--line);
}

.button-hero,
.button-launch {
  padding: 14px 22px;
  font-size: 0.98rem;
}

.button-launch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  background: linear-gradient(135deg, #e9b669 0%, #d78b3f 100%);
  color: #fffdf8;
  box-shadow: 0 14px 28px rgba(215, 139, 63, 0.20);
}

.daily-focus-card {
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  background: linear-gradient(180deg, rgba(255, 246, 226, 0.96) 0%, rgba(255, 251, 245, 0.98) 100%);
}

.merged-hero-card {
  min-height: 0;
  padding-top: 26px;
  padding-bottom: 26px;
}

.merged-hero-card h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  max-width: 12ch;
}

.merged-hero-card .hero-copy {
  max-width: 44ch;
  font-size: 0.98rem;
}

.section-heading,
.section-heading-top {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.section-intro-copy {
  max-width: 52ch;
}

.subject-catalog {
  display: grid;
  gap: 22px;
}

.subject-grid-main {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.9fr);
  gap: 22px;
}

.subject-grid-side {
  display: grid;
  gap: 18px;
}

.subject-card {
  padding: 26px;
}

.subject-card-live {
  display: grid;
  gap: 0;
}

.subject-summary-toggle,
.subsection-summary {
  list-style: none;
  cursor: pointer;
}

.subject-summary-toggle::-webkit-details-marker,
.subsection-summary::-webkit-details-marker {
  display: none;
}

.subject-summary-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.subject-subsection {
  display: grid;
  gap: 12px;
}

.subsection-summary {
  font-weight: 800;
  color: var(--text);
  padding: 2px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.summary-hint {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}

.subject-card-coming-soon {
  display: grid;
  gap: 16px;
  background: linear-gradient(180deg, rgba(255, 249, 240, 0.98) 0%, rgba(255, 251, 245, 0.96) 100%);
}

.subject-card-header {
  display: flex;
  gap: 16px;
  align-items: start;
}

.subject-icon {
  width: 52px;
  height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
  background: rgba(255, 223, 170, 0.42);
  font-size: 1.5rem;
}

.subject-title-large {
  font-size: 1.35rem;
  font-weight: 800;
}

.mini-badge,
.chip,
.chip-soft {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.mini-badge {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.chip {
  background: rgba(255, 255, 255, 0.78);
  color: var(--muted);
  border: 1px solid rgba(198, 157, 104, 0.08);
}

.chip-soft {
  background: rgba(255, 242, 219, 0.72);
  color: var(--muted);
}

.subject-card-body {
  display: grid;
  gap: 20px;
}

.quiz-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.subject-card-live .quiz-card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.quiz-card {
  display: grid;
  gap: 16px;
  padding: 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(198, 157, 104, 0.12);
  box-shadow: 0 10px 26px rgba(109, 79, 42, 0.06);
}

.quiz-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.coming-soon-list {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.subject-footer-note {
  font-weight: 700;
  color: var(--accent-strong);
}

.quiz-shell {
  width: min(1180px, calc(100% - 32px));
}

.quiz-topbar,
.question-panel,
.sidebar-panel,
.info-card {
  padding: 24px;
}

.quiz-topbar {
  display: grid;
  gap: 12px;
}

.back-link {
  color: var(--accent-strong);
  text-decoration: none;
  font-weight: 700;
}

.quiz-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(280px, 0.8fr);
  gap: 24px;
}

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.7fr);
  gap: 24px;
}

.question-panel,
.sidebar-panel {
  min-height: 420px;
}

.info-card {
  border: 1px solid rgba(198, 157, 104, 0.12);
}

.question-text {
  line-height: 1.45;
  font-size: clamp(1.4rem, 2vw, 2rem);
}

.choices {
  display: grid;
  gap: 12px;
}

.choice-button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left;
  padding: 16px;
  background: rgba(255, 255, 255, 0.84);
  border: 1px solid rgba(198, 157, 104, 0.14);
  color: var(--text);
  border-radius: 16px;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.choice-button:hover:not(:disabled) {
  transform: translateY(-1px);
  border-color: rgba(215, 139, 63, 0.48);
}

.choice-button:disabled {
  cursor: default;
  opacity: 1;
}

.choice-letter {
  width: 32px;
  height: 32px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(215, 139, 63, 0.16);
  color: var(--accent-strong);
  font-weight: 800;
  flex: 0 0 auto;
}

.choice-correct {
  border-color: rgba(78, 166, 118, 0.46);
  background: rgba(78, 166, 118, 0.11);
}

.choice-wrong {
  border-color: rgba(208, 108, 96, 0.40);
  background: rgba(208, 108, 96, 0.10);
}

.feedback {
  padding: 18px;
  border-radius: 16px;
  border: 1px solid transparent;
}

.feedback p {
  margin-top: 8px;
  color: var(--text);
  line-height: 1.6;
}

.feedback-correct {
  background: rgba(78, 166, 118, 0.12);
  border-color: rgba(78, 166, 118, 0.30);
}

.feedback-wrong {
  background: rgba(208, 108, 96, 0.10);
  border-color: rgba(208, 108, 96, 0.26);
}

.result-view {
  display: grid;
  gap: 10px;
  align-content: center;
  min-height: 320px;
}

.guide-section {
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(198, 157, 104, 0.12);
}

.guide-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 10px;
  color: var(--text);
}

.guide-list.compact {
  gap: 8px;
}

.formula-block {
  margin: 2px 0 6px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255, 247, 234, 0.95);
  border: 1px solid rgba(198, 157, 104, 0.18);
  overflow-x: auto;
}

.formula-block .katex-display {
  margin: 0;
}

.result-score {
  font-size: 3rem;
  font-weight: 800;
}

.hidden {
  display: none;
}

@media (max-width: 980px) {
  .hero-grid,
  .subject-grid-main,
  .quiz-layout,
  .guide-layout,
  .subject-card-live .quiz-card-grid {
    grid-template-columns: 1fr;
  }

  .daily-focus-card,
  .section-heading,
  .section-heading-top,
  .subject-summary-toggle {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 20px, 1180px);
    padding-top: 20px;
  }

  .morning-hero-card,
  .daily-focus-card,
  .subject-card,
  .quiz-topbar,
  .question-panel,
  .sidebar-panel,
  .info-card {
    padding: 20px;
  }

  .button,
  .button-launch,
  .button-hero {
    width: 100%;
    justify-content: center;
  }
}