:root {
  --bg: #fbf9f5;
  --surface: #ffffff;
  --surface-alt: #f4efe6;
  --text: #18181b;
  --text-muted: #52525b;
  --text-soft: #71717a;
  --border: #e7e0d3;
  --accent: #d94826;
  --accent-soft: #fdf0ec;
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --teal: #0f766e;
  --teal-soft: #f0fdfa;
  --purple: #7e22ce;
  --purple-soft: #faf5ff;
  --amber: #b45309;
  --amber-soft: #fffbeb;
  --green: #15803d;
  --green-soft: #f0fdf4;
  --shadow-sm: 0 1px 3px rgba(24, 24, 27, 0.05);
  --shadow-md: 0 10px 30px rgba(24, 24, 27, 0.08);
  --radius: 14px;
  --font-serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

body.dark {
  --bg: #141416;
  --surface: #1d1d21;
  --surface-alt: #26262b;
  --text: #f4f4f5;
  --text-muted: #a1a1aa;
  --text-soft: #71717a;
  --border: #2e2e36;
  --accent: #f06543;
  --accent-soft: rgba(240, 101, 67, 0.14);
  --blue: #60a5fa;
  --blue-soft: rgba(96, 165, 250, 0.14);
  --teal: #2dd4bf;
  --teal-soft: rgba(45, 212, 191, 0.14);
  --purple: #c084fc;
  --purple-soft: rgba(192, 132, 252, 0.14);
  --amber: #fbbf24;
  --amber-soft: rgba(251, 191, 36, 0.14);
  --green: #4ade80;
  --green-soft: rgba(74, 222, 128, 0.14);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 14px 36px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

/* 顶部栏 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 11px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.18s ease;
}

.back-link:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.brand-title-wrap {
  min-width: 0;
}

.brand-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--accent);
  font-weight: 700;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.action-pill {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
  font-family: inherit;
}

.action-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

.action-pill.primary:hover {
  opacity: 0.92;
  color: #fff;
}

.icon-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  font-size: 16px;
  display: grid;
  place-items: center;
}

/* Hero */
.hero-band {
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-alt) 100%);
}

.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

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

.hero-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 10px;
}

.hero-copy h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  line-height: 1.3;
  margin-bottom: 8px;
}

.hero-copy p {
  color: var(--text-muted);
  font-size: 14px;
}

.hero-stats {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 20px;
  min-width: 96px;
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
}

.stat-num.accent {
  color: var(--green);
}

.stat-num.star {
  color: var(--amber);
}

.stat-label {
  font-size: 12px;
  color: var(--text-soft);
}

/* 筛选条 */
.controls-band {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.controls-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.search-box {
  flex: 1 1 320px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px;
  color: var(--text-soft);
}

.search-box:focus-within {
  border-color: var(--accent);
}

.search-box input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-size: 13.5px;
  font-family: inherit;
}

.clear-btn {
  border: none;
  background: var(--surface-alt);
  color: var(--text-muted);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
}

.year-pills,
.status-pills {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-chip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.filter-chip.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.category-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.cat-tab {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  transition: all 0.15s ease;
}

.cat-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* 案例网格 */
.main-grid-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 20px 64px;
}

.result-meta-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-soft);
}

.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 18px;
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  box-shadow: var(--shadow-sm);
}

.case-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.case-card.mastered {
  border-left: 4px solid var(--green);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.card-badges {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.case-code-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--surface-alt);
  color: var(--text);
}

.case-year-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent);
}

.case-cat-tag {
  font-size: 11.5px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
}

.cat-tea { background: var(--accent-soft); color: var(--accent); }
.cat-platform { background: var(--blue-soft); color: var(--blue); }
.cat-tech { background: var(--teal-soft); color: var(--teal); }
.cat-social { background: var(--purple-soft); color: var(--purple); }
.cat-culture { background: var(--amber-soft); color: var(--amber); }

.card-quick-actions {
  display: flex;
  gap: 6px;
}

.mini-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-soft);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 12px;
  cursor: pointer;
}

.mini-btn.active-star {
  border-color: var(--amber);
  background: var(--amber-soft);
  color: var(--amber);
}

.mini-btn.active-master {
  border-color: var(--green);
  background: var(--green-soft);
  color: var(--green);
}

.card-brand {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-soft);
  letter-spacing: 0.02em;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 17.5px;
  line-height: 1.35;
  color: var(--text);
  margin-top: 2px;
}

.card-film-box {
  background: var(--surface-alt);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
}

.card-film-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--accent);
  display: block;
  margin-bottom: 2px;
}

.card-highlights {
  font-size: 13px;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-theories {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  padding-top: 6px;
  border-top: 1px dashed var(--border);
}

.theory-pill {
  font-size: 11.5px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--text-muted);
  font-weight: 500;
}

/* 弹窗 */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  background: rgba(15, 15, 18, 0.58);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.detail-modal,
.quiz-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  width: 100%;
  max-width: 780px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.quiz-modal {
  max-width: 640px;
}

.modal-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.modal-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.modal-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-action {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text-muted);
  padding: 5px 10px;
  border-radius: 8px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.icon-action.active-star {
  background: var(--amber-soft);
  border-color: var(--amber);
  color: var(--amber);
}

.icon-action.active-master {
  background: var(--green-soft);
  border-color: var(--green);
  color: var(--green);
}

.close-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 15px;
}

.modal-body,
.quiz-body {
  padding: 22px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.detail-brand {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.detail-title {
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.35;
  margin-top: 4px;
}

.detail-section {
  background: var(--surface-alt);
  border-radius: 12px;
  padding: 15px 16px;
}

.detail-section h3 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.detail-section ul {
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--text-muted);
}

.detail-section p {
  font-size: 14px;
  color: var(--text-muted);
}

.quote-block {
  background: var(--surface);
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.copy-pill {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  cursor: pointer;
  font-family: inherit;
}

.copy-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.note-area {
  width: 100%;
  min-height: 84px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-family: inherit;
  font-size: 13.5px;
  resize: vertical;
}

.modal-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-btn {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.modal-index {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-soft);
}

/* 抽背样式 */
.quiz-question-card {
  background: var(--surface-alt);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}

.quiz-prompt {
  font-size: 13.5px;
  color: var(--text-soft);
  margin-top: 10px;
}

.quiz-answer {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.empty-state {
  text-align: center;
  padding: 56px 20px;
  color: var(--text-soft);
}

.empty-icon {
  font-size: 40px;
  margin-bottom: 8px;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  z-index: 90;
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  .topbar-inner {
    flex-wrap: wrap;
  }
  .hero-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-stats {
    width: 100%;
  }
  .stat-card {
    flex: 1;
    min-width: 0;
    padding: 10px;
  }
  .cases-grid {
    grid-template-columns: 1fr;
  }
}