:root {
  color-scheme: light;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #d7dee8;
  --paper: #f7f9fc;
  --surface: #ffffff;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --warm: #b45309;
  --mark: #fde68a;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  font-family: "Inter", "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(15, 118, 110, 0.08), rgba(247, 249, 252, 0) 280px),
    var(--paper);
}

button,
input {
  font: inherit;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 36px 24px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
}

.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  box-shadow: 0 10px 26px rgba(15, 23, 42, 0.08);
  transition: color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.github-link svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.github-link:hover,
.github-link:focus-visible {
  color: var(--accent-strong);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.brand-logo,
.crest {
  width: 64px;
  height: 64px;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  border: 1px solid var(--line);
}

.crest {
  width: 52px;
  height: 52px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

.subtitle {
  margin: 8px 0 0;
  color: var(--muted);
}

.shell {
  max-width: 1180px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 14px 0 18px;
  background: rgba(247, 249, 252, 0.92);
  backdrop-filter: blur(14px);
}

.search-box {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr) 36px;
  align-items: center;
  min-height: 52px;
  padding: 0 10px 0 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.search-icon {
  width: 15px;
  height: 15px;
  border: 2px solid var(--muted);
  border-radius: 50%;
  position: relative;
}

.search-icon::after {
  content: "";
  position: absolute;
  width: 7px;
  height: 2px;
  right: -6px;
  bottom: -3px;
  border-radius: 999px;
  background: var(--muted);
  transform: rotate(45deg);
}

.search-box input {
  width: 100%;
  border: 0;
  outline: 0;
  color: var(--ink);
  background: transparent;
}

.icon-button {
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 8px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.icon-button:hover,
.icon-button:focus-visible {
  color: var(--ink);
  background: #eef2f7;
}

.stats {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  color: var(--muted);
  white-space: nowrap;
}

.stats span {
  width: 1px;
  height: 18px;
  background: var(--line);
}

.stats strong {
  color: var(--accent-strong);
}

.subjects {
  display: grid;
  gap: 14px;
}

.subject-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
}

.subject-button {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 16px;
  align-items: center;
  width: 100%;
  min-height: 86px;
  padding: 18px 20px;
  color: inherit;
  text-align: left;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.subject-button:hover,
.subject-button:focus-visible {
  background: #f8fafc;
}

.subject-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}

.subject-title h2 {
  margin: 0;
  overflow-wrap: anywhere;
  font-size: 1.25rem;
  line-height: 1.2;
}

.subject-title small {
  color: var(--muted);
  white-space: nowrap;
}

.subject-desc {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.type-row {
  display: flex;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 180px;
}

.type-chip {
  min-width: 42px;
  padding: 4px 8px;
  border: 1px solid #cbd5e1;
  border-radius: 999px;
  color: #334155;
  background: #f8fafc;
  font-size: 0.78rem;
  text-align: center;
}

.chevron {
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 160ms ease;
}

.subject-card[data-open="true"] .chevron {
  transform: rotate(225deg);
}

.file-list {
  display: none;
  padding: 0 20px 20px;
}

.subject-card[data-open="true"] .file-list {
  display: grid;
  gap: 8px;
}

.file-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  min-height: 48px;
  padding: 9px 10px 9px 14px;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  background: #fbfdff;
}

.file-meta {
  min-width: 0;
}

.file-name {
  overflow-wrap: anywhere;
  font-weight: 650;
}

.file-path {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.file-actions {
  display: flex;
  gap: 8px;
}

.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
  font-size: 0.88rem;
}

.action.primary {
  color: #fff;
  border-color: var(--accent);
  background: var(--accent);
}

.action:hover,
.action:focus-visible {
  border-color: var(--warm);
  color: var(--warm);
}

.action.primary:hover,
.action.primary:focus-visible {
  color: #fff;
  border-color: var(--accent-strong);
  background: var(--accent-strong);
}

mark {
  padding: 0 2px;
  border-radius: 3px;
  color: inherit;
  background: var(--mark);
}

.empty-state {
  margin: 48px 0;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    padding: 26px 16px 14px;
  }

  .brand {
    gap: 12px;
  }

  .github-link {
    width: 40px;
    height: 40px;
  }

  .brand-logo {
    width: 52px;
    height: 52px;
  }

  .crest {
    display: none;
  }

  .shell {
    padding: 0 16px;
  }

  .toolbar {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .stats {
    justify-content: flex-start;
  }

  .subject-button {
    grid-template-columns: minmax(0, 1fr) auto;
    min-height: 74px;
    padding: 16px;
  }

  .type-row {
    grid-column: 1 / -1;
    justify-content: flex-start;
    min-width: 0;
  }

  .file-list {
    padding: 0 12px 14px;
  }

  .file-item {
    grid-template-columns: 1fr;
  }

  .file-actions {
    justify-content: flex-start;
  }
}