/* ============================================================
   PPThub — AuthKit-style Frosted Glass Design System
   Base tokens derived from DESIGN(1).md
   ============================================================ */

:root {
  /* ---- Colors (remapped to cream/forest system; old names kept for compatibility) ---- */
  --color-midnight-canvas: #fcfaf5;          /* cream canvas */
  --color-steel-plate: #1a3300;              /* forest ink */
  --color-fog-veil: #6b6b6b;                 /* muted gray text */
  --color-moon-mist: #565c47;                /* secondary text (muted forest-gray) */
  --color-frost-glow: #1a3300;               /* primary text */
  --color-ice-highlight: #1a3300;            /* emphasized text / titles */
  --color-pure-white: #ffffff;
  --color-void-violet: #1a3300;              /* forest ink (accent fill) */
  --color-blueprint-blue: #cb5521;           /* terracotta accent */
  --color-ember-glow: #cb5521;               /* terracotta */
  --color-signal-blue: #1a3300;              /* forest */
  --color-deep-teal: #a8e5e5;                /* sticky-note teal */
  --color-gridline-blue: #b6b6b6;            /* pencil gray */
  --color-glass-edge: rgba(26, 51, 0, 0.12);
  --color-luminous-fill: rgba(26, 51, 0, 0.04);

  /* ---- Canonical cream/forest tokens (aligned with 优卡导航) ---- */
  --color-forest-ink: #1a3300;
  --color-highlighter-yellow: #ffe95c;
  --color-cream-paper: #fcfaf5;
  --color-pencil-gray: #b6b6b6;
  --color-whisper-gray: #f1f1f1;
  --color-sticky-note-teal: #a8e5e5;
  --color-sticky-note-mint: #d5f5c2;
  --color-sticky-note-blush: #f6d0ff;
  --color-terracotta: #cb5521;

  --gradient-ice-highlight: linear-gradient(0deg, #1a3300 0%, #3a5a1a 100%);
  --surface-frosted-glass: rgba(26, 51, 0, 0.03);
  --surface-deep-glass: rgba(252, 250, 245, 0.98);

  /* ---- Typography ---- */
  --font-display: 'Bricolage Grotesque', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', ui-sans-serif, system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'Roboto Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  /* 跨平台中文衬线栈 */
  --font-serif: "Songti SC", "SimSun", "STSong", "Noto Serif SC", "Noto Serif CJK SC", Georgia, "Times New Roman", serif;

  /* ---- Spacing ---- */
  --spacing-4: 4px;
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-16: 16px;
  --spacing-20: 20px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-56: 56px;
  --spacing-100: 100px;
  --spacing-120: 120px;
  --page-max-width: 1200px;
  --section-gap: 120px;
  --card-padding: 24px;

  /* ---- Radius (aligned: cards 12 / buttons 6 / badges pill / nav 16) ---- */
  --radius-cards: 12px;
  --radius-badges: 9999px;
  --radius-inputs: 6px;
  --radius-modals: 12px;
  --radius-buttons: 6px;
  --radius-iconcontainers: 9999px;
  --radius-nav: 16px;

  /* ---- Shadows (flat, forest-tinted) ---- */
  --shadow-sm: rgba(26, 51, 0, 0.08) 0 1px 2px 0;
  --shadow-md: rgba(26, 51, 0, 0.10) 0 1px 3px 0;
  --shadow-subtle: rgba(26, 51, 0, 0.05) 0 1px 2px 0;
  --shadow-feature: 0 12px 24px rgba(26, 51, 0, 0.10);
  --shadow-modal: 0 20px 50px rgba(26, 51, 0, 0.20);
  --shadow-card: rgba(26, 51, 0, 0.05) 0 1px 2px 0;
  --shadow-glow: rgba(255, 233, 92, 0.35) 0 10px 30px 0, rgba(26, 51, 0, 0.05) 0 2px 8px 0;
  --shadow-violet: rgba(26, 51, 0, 0.25) 0 8px 24px 0;
}

/* ============================================================
   Reset
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--color-midnight-canvas);
  color: var(--color-frost-glow);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}

::selection { background: rgba(26, 51, 0, 0.4); color: #fff; }

/* ============================================================
   Background atmosphere — blueprint grid + conic spotlight
   ============================================================ */
.bg-layer {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--color-midnight-canvas);
  background-image:
    linear-gradient(rgba(26, 51, 0, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 51, 0, 0.06) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 0%, transparent 85%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 0%, transparent 85%);
}
.bg-spotlight {
  position: fixed;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 1200px;
  height: 700px;
  z-index: -1;
  pointer-events: none;
  background: conic-gradient(at 50% 0%,
    transparent 45%,
    rgba(26, 51, 0, 0.28) 49%,
    rgba(26, 51, 0, 0.5) 50%,
    rgba(26, 51, 0, 0.28) 51%,
    transparent 55%);
  filter: blur(20px);
  opacity: 0.7;
}

/* ============================================================
   Fixed top navigation bar
   ============================================================ */
/* ============================================================
   Top navigation bar — 照搬 优卡导航
   ============================================================ */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(26, 51, 0, 0.55);
  border-bottom: 1px solid var(--color-glass-edge);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--color-frost-glow);
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
}
.brand-logo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid rgba(26, 51, 0, 0.15);
  vertical-align: middle;
}
.header-actions {
  display: flex;
  gap: 12px;
  align-items: center;
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}
.search-wrap {
  display: flex;
  gap: 10px;
  background: rgba(26, 51, 0, 0.04);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-buttons);
  padding: 8px 8px 8px 20px;
  box-shadow: var(--shadow-card);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.header-actions .search-wrap {
  flex: 1;
  max-width: 340px;
  margin: 0;
  padding: 4px 6px 4px 16px;
}
.search-wrap:focus-within {
  border-color: rgba(26, 51, 0, 0.28);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.search-wrap .ico {
  color: var(--color-fog-veil);
  display: flex;
  align-items: center;
}
.search-wrap input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--color-pure-white);
  font-family: var(--font-body);
  font-size: 14px;
  min-width: 0;
}
.search-wrap input::placeholder { color: var(--color-fog-veil); opacity: 0.8; }
.search-btn {
  border: none;
  border-radius: var(--radius-buttons);
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font-body);
  background: var(--color-void-violet, #1a3300);
  color: #fff;
  cursor: pointer;
  box-shadow: var(--shadow-violet);
  transition: transform 0.2s ease, filter 0.2s ease;
  white-space: nowrap;
}
.search-btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.search-count {
  font-size: 12px;
  color: var(--color-fog-veil);
  margin-left: 10px;
  white-space: nowrap;
}
.search-count:empty { display: none; }

/* ============================================================
   Layout container
   ============================================================ */
.container {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-24);
}

/* ============================================================
   Eyebrow label
   ============================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-16);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--color-moon-mist);
  margin-bottom: var(--spacing-24);
}
.eyebrow::before, .eyebrow::after {
  content: "";
  height: 1px;
  width: 56px;
  background: linear-gradient(90deg, transparent, rgba(26, 51, 0, 0.12), transparent);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding-top: var(--spacing-120);
  padding-bottom: var(--spacing-56);
  text-align: center;
}
.hero-wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(64px, 13vw, 150px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  background: var(--gradient-ice-highlight);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  text-shadow: 0 0 30px rgba(26, 51, 0, 0.12);
  margin-bottom: var(--spacing-24);
}
.hero-sub {
  font-size: 18px;
  color: var(--color-moon-mist);
  max-width: 640px;
  margin: 0 auto var(--spacing-40);
  white-space: normal;
}

/* ============================================================
   Search
   ============================================================ */
.search-wrap {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}
.search-input {
  width: 100%;
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-inputs);
  padding: 14px 16px 14px 46px;
  color: var(--color-pure-white);
  font-family: var(--font-body);
  font-size: 16px;
  outline: none;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.search-input::placeholder { color: rgba(26, 51, 0, 0.6); }
.search-input:focus {
  border-color: rgba(26, 51, 0, 0.6);
  box-shadow: 0 0 0 1px rgba(26, 51, 0, 0.4), 0 0 18px rgba(26, 51, 0, 0.3);
}
.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px; height: 18px;
  color: var(--color-fog-veil);
  pointer-events: none;
}
.result-count {
  text-align: left;
  margin: 0 0 var(--spacing-20);
  font-size: 14px;
  color: var(--color-fog-veil);
}

/* ============================================================
   Content layout — category sidebar (left) + main grid (right)
   ============================================================ */
.layout {
  display: grid;
  grid-template-columns: 176px minmax(0, 1fr);
  gap: var(--spacing-40);
  align-items: start;
  margin-top: var(--spacing-40);
}
.main-col { min-width: 0; }
.side-col {
  position: sticky;
  top: 88px; /* 64px sticky nav + breathing room */
  align-self: start;
}

/* ============================================================
   Category sidebar (vibe-hub style vertical list)
   ============================================================ */
.cat-panel {
  background: rgba(26, 51, 0, 0.04);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-cards);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  padding: 20px 14px;
  max-height: calc(100vh - 112px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(26, 51, 0, 0.18) transparent;
}
.cat-panel::-webkit-scrollbar { width: 6px; }
.cat-panel::-webkit-scrollbar-thumb { background: rgba(26, 51, 0, 0.18); border-radius: 3px; }
.cat-panel::-webkit-scrollbar-track { background: transparent; }
.cat-panel-title {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-frost-glow);
  opacity: 0.6;
  margin-bottom: 14px;
  padding: 0 10px;
}
.cat-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: var(--spacing-8);
}
.cat-pill {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--spacing-8);
  width: 100%;
  text-align: left;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-frost-glow);
  background: transparent;
  border: none;
  border-radius: var(--radius-inputs);
  padding: 7px 12px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
  user-select: none;
}
.cat-pill:hover {
  background: rgba(26, 51, 0, 0.06);
  color: var(--color-pure-white);
}
.cat-pill.active {
  background: var(--color-void-violet);
  color: #fff;
  box-shadow: var(--shadow-violet);
  transform: translateX(2px);
}

/* ============================================================
   Level section headers (入门 / 进阶 grouping)
   ============================================================ */
.level-section-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  margin: var(--spacing-40) 0 var(--spacing-20);
  padding-bottom: var(--spacing-12);
  border-bottom: 1px solid rgba(26, 51, 0, 0.08);
}
.level-section-header:first-child {
  margin-top: 0;
}
.level-section-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ice-highlight);
  letter-spacing: -0.01em;
}
.level-section-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-fog-veil);
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-badges);
  padding: 2px 10px;
  letter-spacing: 0.04em;
}

/* ============================================================
   Term grid + cards
   ============================================================ */
.term-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--spacing-24);
}

/* Level section headers (入门 / 进阶 分组，与 PPT 术语图鉴一致) */
.level-section-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  margin: var(--spacing-40) 0 var(--spacing-20);
  padding-bottom: var(--spacing-12);
  border-bottom: 1px solid rgba(26, 51, 0, 0.08);
}
.level-section-header:first-child {
  margin-top: 0;
}
.level-section-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ice-highlight);
  letter-spacing: -0.01em;
}
.level-section-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-fog-veil);
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-badges);
  padding: 2px 10px;
  letter-spacing: 0.04em;
}
@media (max-width: 640px) {
  .term-grid { grid-template-columns: 1fr; }
}
.term-card {
  background: var(--surface-frosted-glass);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-cards);
  padding: var(--card-padding);
  cursor: pointer;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-12);
  min-height: 150px;
  position: relative;
  overflow: hidden;
}
.term-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-cards);
  background: linear-gradient(180deg, rgba(216, 236, 248, 0.06), transparent 40%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}
.term-card:hover {
  transform: translateY(-6px);
  border-color: rgba(26, 51, 0, 0.24);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}
.term-card:hover::after { opacity: 1; }
.term-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--spacing-8);
}
.term-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  color: var(--color-ice-highlight);
  flex-shrink: 0;
}
.term-alias {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-fog-veil);
  letter-spacing: 0.04em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}
.term-summary {
  font-size: 14px;
  color: var(--color-moon-mist);
  line-height: 1.5;
  flex: 1;
}
.term-meta {
  display: flex;
  gap: var(--spacing-8);
  align-items: center;
  flex-wrap: wrap;
}
.badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--color-frost-glow);
  background: var(--color-luminous-fill);
  border-radius: var(--radius-buttons);
  padding: 2px 8px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.badge-level {
  background: rgba(26, 51, 0, 0.14);
  color: #1a3300;
  border: 1px solid rgba(26, 51, 0, 0.35);
}

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-100) var(--spacing-24);
  color: var(--color-fog-veil);
  background: var(--surface-frosted-glass);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-cards);
}

/* ============================================================
   Modal (term detail)
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: var(--spacing-56) var(--spacing-24);
  overflow-y: auto;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
/* blur 放到 ::before 上：避免 backdrop-filter 让 .modal-overlay 成为
   fixed 子元素(.modal-nav) 的包含块，导致弹窗内滚动时按钮跟着滑走 */
.modal-overlay::before {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(26, 51, 0, 0.78);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: -1;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }

.modal-card {
  background: var(--surface-deep-glass);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-modals);
  box-shadow: var(--shadow-modal);
  max-width: 860px;
  width: 100%;
  padding: var(--spacing-40);
  position: relative;
  transform: translateY(16px) scale(0.98);
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}
.modal-overlay.open .modal-card { transform: translateY(0) scale(1); }

.modal-close {
  position: absolute;
  top: var(--spacing-24);
  right: var(--spacing-24);
  width: 36px; height: 36px;
  border-radius: var(--radius-iconcontainers);
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  color: var(--color-frost-glow);
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s ease;
}
.modal-close:hover { background: rgba(26, 51, 0, 0.14); }

/* Prev / next term navigation (sides of modal) */
/* Prev / next tip navigation — 浏览器视口固定悬浮 */
.modal-nav {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  height: 46px;
  min-width: 46px;
  max-width: 190px;
  padding: 0 18px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--color-pencil-gray);
  color: var(--color-forest-ink);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,.10);
  transition: background 0.2s ease, transform 0.2s ease, opacity 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  z-index: 200;
}
.modal-nav:hover:not(:disabled) {
  background: var(--color-sticky-note-mint);
  border-color: var(--color-forest-ink);
  color: var(--color-forest-ink);
  box-shadow: 0 4px 14px rgba(0,0,0,.15);
}
.modal-nav:active:not(:disabled) { transform: translateY(-50%) scale(0.96); }
.modal-nav:disabled { opacity: 0.25; cursor: default; }
.modal-nav-prev { left: var(--spacing-24); }
.modal-nav-next { right: var(--spacing-24); }
.nav-arrow { font-size: 22px; font-weight: 300; line-height: 1; flex-shrink: 0; }
.nav-name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-body);
}

.modal-head { margin-bottom: var(--spacing-24); padding-right: var(--spacing-40); }
.modal-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 34px;
  color: var(--color-ice-highlight);
  line-height: 1.1;
}
.modal-alias {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-fog-veil);
  margin-top: var(--spacing-8);
  letter-spacing: 0.04em;
}
.modal-meta { display: flex; gap: var(--spacing-8); margin-top: var(--spacing-16); flex-wrap: wrap; }

.modal-section { margin-top: var(--spacing-40); }
.modal-head + .modal-section { margin-top: var(--spacing-16); }
.modal-section h4 {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-blueprint-blue);
  margin-bottom: var(--spacing-12);
  font-weight: 600;
}
.modal-detail { font-size: 16px; color: var(--color-frost-glow); line-height: 1.7; }
.modal-scenario { font-size: 15px; color: var(--color-moon-mist); line-height: 1.6; }

/* 补充区块（速记/误区/快捷键/清单/对比/口诀…） */
.modal-lead {
  margin-top: var(--spacing-16);
  font-size: 17px; line-height: 1.6; color: var(--color-ice-highlight);
  padding: var(--spacing-12) var(--spacing-16);
  background: rgba(26, 51, 0, 0.08);
  border-left: 3px solid var(--color-blueprint-blue);
  border-radius: 0 var(--radius-buttons) var(--radius-buttons) 0;
}
.modal-pitfall .modal-pit {
  font-size: 15px; color: var(--color-moon-mist); line-height: 1.6;
  padding: var(--spacing-12) var(--spacing-16);
  background: rgba(203, 85, 33, 0.10);
  border-left: 3px solid #cb5521;
  border-radius: 0 var(--radius-buttons) var(--radius-buttons) 0;
}
.modal-kbd { font-size: 14px; color: var(--color-frost-glow); line-height: 1.6; font-family: var(--font-mono); }
.modal-check { margin: 0; padding-left: 20px; }
.modal-check li { font-size: 14px; color: var(--color-moon-mist); line-height: 1.8; }
.modal-ba { font-size: 15px; color: var(--color-frost-glow); line-height: 1.6; }
.modal-extra { font-size: 15px; color: var(--color-frost-glow); line-height: 1.6; }

/* 改前 vs 改后 · 上下排版 + 放大区域（竖排更清晰） */
.ba-grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-24); margin-top: var(--spacing-16); }
.ba-panel { display: flex; flex-direction: column; gap: var(--spacing-10); min-width: 0; }
/* 详情页改前/改后大图：直接用与卡片同款的 PNG 截图，固定 480:270 舞台 + object-fit:cover */
.ba-shot { width: 100%; max-width: 680px; aspect-ratio: 480 / 270; object-fit: cover; display: block;
  border: 1px solid var(--color-glass-edge); border-radius: var(--radius-cards); background: #f1f1f1; }
.ba-tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 3px 10px;
  border-radius: 999px;
}
.ba-tag.before { color: #cb5521; background: rgba(203, 85, 33, 0.12); border: 1px solid rgba(203, 85, 33, 0.35); }
.ba-tag.after  { color: #1a3300; background: rgba(168, 229, 229, 0.14); border: 1px solid rgba(168, 229, 229, 0.40); }
.ba-slide {
  position: relative;
  width: 480px;
  height: 270px;
  transform-origin: top left;
  background: rgba(26, 51, 0, 0.55);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-cards);
  overflow: hidden;
}
/* 固定舞台 + 等比缩放：卡片缩略与详情大图渲染同一份 DOM，仅缩放比不同 → 零错位 */
.ba-frame { container-type: inline-size; width: 100%; aspect-ratio: 480 / 270; overflow: hidden; position: relative; }
.ba-frame .ba-slide { transform: scale(min(1, calc(100cqw / 480))); }
@media (max-width: 640px) { .ba-grid { grid-template-columns: 1fr; } }
@keyframes baPulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.12); opacity: 0.78; } }

.related-list { display: flex; flex-wrap: wrap; gap: var(--spacing-8); }
.related-chip {
  font-size: 13px;
  color: var(--color-frost-glow);
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-buttons);
  padding: 6px 14px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease;
}
.related-chip:hover { background: rgba(26, 51, 0, 0.16); border-color: rgba(26, 51, 0, 0.5); }

/* Demo mount */
.demo-mount {
  margin-top: var(--spacing-16);
  background: rgba(26, 51, 0, 0.03);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-cards);
  padding: var(--spacing-24);
  min-height: 120px;
}
.demo-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-fog-veil);
  margin-bottom: var(--spacing-16);
  display: flex; align-items: center; gap: var(--spacing-8);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  margin-top: var(--spacing-120);
  padding: var(--spacing-48) 0 var(--spacing-56);
  border-top: 1px solid var(--color-glass-edge);
  text-align: center;
  color: var(--color-fog-veil);
  font-size: 14px;
}
.site-footer strong { color: var(--color-frost-glow); font-weight: 500; }

/* ============================================================
   Shared demo controls
   ============================================================ */
.demo-btn {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-pure-white);
  background: rgba(26, 51, 0, 0.06);
  border: 1px solid var(--color-glass-edge);
  border-radius: var(--radius-buttons);
  padding: 8px 16px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.demo-btn:hover { background: rgba(26, 51, 0, 0.12); transform: translateY(-1px); }
.demo-btn.active {
  background: var(--color-void-violet);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-violet);
}
.demo-row { display: flex; flex-wrap: wrap; gap: var(--spacing-8); align-items: center; }
.demo-stack { display: flex; flex-direction: column; gap: var(--spacing-16); }
.demo-label { font-size: 12px; color: var(--color-fog-veil); font-family: var(--font-mono); }
.demo-slider { width: 100%; accent-color: var(--color-void-violet); }

/* mini "slide" used by many demos */
.mini-slide {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #eef3e6, #dfe9cf);
  border: 1px solid var(--color-glass-edge);
  border-radius: 10px;
  overflow: hidden;
}

/* Tablet / narrow: sidebar collapses to a horizontal bar on top */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-24);
  }
  .side-col {
    position: static;
    top: auto;
    order: -1;
  }
  .cat-panel {
    max-height: none;
    padding: 14px;
  }
  .cat-panel-title { display: none; }
  .cat-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-8);
    margin-top: 0;
  }
  .cat-pill { width: auto; }
  .cat-pill.active { transform: none; }
}

@media (max-width: 640px) {
  .hero { padding-top: var(--spacing-100); }
  .modal-card { padding: var(--spacing-24); }
  .modal-title { font-size: 28px; }
  .header-actions .search-wrap { max-width: 220px; padding: 6px 6px 6px 12px; }
  .header-actions .search-wrap input { font-size: 14px; }
  .header-actions .search-btn { padding: 8px 12px; }
  .brand span { font-size: 16px; }
}

/* 弹窗左右导航按钮：屏幕不够宽时与卡片冲突，隐藏（仍可用 ← → 键切换） */
@media (max-width: 1100px) {
  .modal-nav { display: none; }
}

/* 强调动画演示用关键帧（脉冲 / 陀螺旋 / 放大） */
@keyframes efPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.15); } }
@keyframes efSpin { from { transform: rotate(0); } to { transform: rotate(360deg); } }
@keyframes efGrow { from { transform: scale(1); } to { transform: scale(1.25); } }

/* ============================================================
   PPT 技巧页 — 追加样式（复用上方 token 与 .ba-*、.demo-*、.related-*）
   ============================================================ */

/* 顶部「术语图鉴」按钮 — 扁平无阴影，吸顶导航栏内 */
.back-link {
  display: inline-flex; align-items: center;
  font-family: var(--font-body); font-size: 13px; font-weight: 500; letter-spacing: -0.01em;
  color: var(--color-forest-ink); text-decoration: none; white-space: nowrap;
  background: #ffffff;
  border: 1px solid var(--color-pencil-gray);
  border-radius: var(--radius-buttons);
  height: 34px; padding: 0 14px;
  box-shadow: none;
  transition: background .18s ease, border-color .18s ease;
}
.back-link:hover {
  background: var(--color-sticky-note-mint);
  border-color: var(--color-forest-ink);
  box-shadow: none;
}
.back-link:active {
  background: var(--color-highlighter-yellow);
  box-shadow: none;
}

/* 卡片：Before | After 缩略条 */
.tech-thumbs { display: grid; grid-template-columns: 1fr auto 1fr; gap: 8px; align-items: center; margin-top: 4px; }
.tech-thumb {
  position: relative; aspect-ratio: 16 / 9; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--color-glass-edge); background: linear-gradient(135deg, #eef3e6, #dfe9cf);
}
.tech-thumb .ba-frame { position: absolute; inset: 0; }
.tech-thumb .ba-slide { border: none; border-radius: 0; }
/* 卡片缩略图：直接引用详情同款 PNG 截图，object-fit:cover 永远完整填满、不再「只有一角」 */
.tech-shot { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.tech-thumb-tag {
  position: absolute; top: 4px; left: 4px; z-index: 2;
  font-family: var(--font-mono); font-size: 9px; letter-spacing: .04em; padding: 1px 6px; border-radius: 999px;
}
.tech-thumb-tag.before { color: #cb5521; background: rgba(203, 85, 33, .14); border: 1px solid rgba(203, 85, 33, .35); }
.tech-thumb-tag.after { color: #1a3300; background: rgba(168, 229, 229, .16); border: 1px solid rgba(168, 229, 229, .4); }
.tech-vs { font-family: var(--font-mono); font-size: 11px; color: var(--color-fog-veil); }

.tech-summary { font-size: 14px; color: var(--color-moon-mist); line-height: 1.5; flex: 1; }

/* 分步操作列表 */
.step-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.step-item {
  position: relative; display: flex; gap: 14px; align-items: flex-start;
  background: rgba(26, 51, 0, .03); border: 1px solid var(--color-glass-edge);
  border-radius: 12px; padding: 12px 14px; transition: border-color .2s ease, background .2s ease;
}
.step-item.active { border-color: rgba(26, 51, 0, .5); background: rgba(26, 51, 0, .08); }
.step-num {
  flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--font-mono); font-size: 13px; font-weight: 600;
  color: #fff; background: var(--color-void-violet); box-shadow: var(--shadow-violet);
}
.step-body { font-size: 15px; color: var(--color-frost-glow); line-height: 1.6; flex: 1; }
.kbd {
  font-family: var(--font-mono); font-size: 12px; color: var(--color-ice-highlight);
  background: rgba(26, 51, 0, .08); border: 1px solid var(--color-glass-edge); border-radius: 5px;
  padding: 1px 7px; margin-left: 8px; white-space: nowrap;
}
.step-play-row { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; }

/* 可拖拽对比滑杆（改前 / 改后） */
.ba-slider {
  position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: 10px; overflow: hidden; container-type: inline-size;
  border: 1px solid var(--color-glass-edge); user-select: none; touch-action: none;
}
.ba-slider .ba-img { position: absolute; inset: 0; }
.ba-slider .ba-slide { transform: scale(calc(100cqw / 480)); }
.ba-slider .ba-img.after { clip-path: inset(0 0 0 50%); }
.ba-slider .ba-label { position: absolute; top: 8px; z-index: 3; font-family: var(--font-mono); font-size: 11px; padding: 2px 8px; border-radius: 999px; }
.ba-slider .ba-label.before { left: 8px; color: #cb5521; background: rgba(203, 85, 33, .16); border: 1px solid rgba(203, 85, 33, .35); }
.ba-slider .ba-label.after { right: 8px; color: #1a3300; background: rgba(168, 229, 229, .18); border: 1px solid rgba(168, 229, 229, .4); }
.ba-slider .ba-handle {
  position: absolute; top: 0; bottom: 0; left: 50%; width: 2px; transform: translateX(-1px);
  background: rgba(216, 236, 248, .8); cursor: ew-resize; z-index: 4;
}
.ba-slider .ba-handle::after {
  content: "⇄"; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 34px; height: 34px; border-radius: 50%; background: rgba(26, 51, 0, .85); border: 1px solid rgba(216, 236, 248, .5);
  color: #fff; display: grid; place-items: center; font-size: 16px;
}

/* tip 块 */
.tip-box {
  font-size: 15px; color: var(--color-moon-mist); line-height: 1.6;
  padding: 12px 16px; background: rgba(26, 51, 0, .08); border-left: 3px solid var(--color-blueprint-blue);
  border-radius: 0 var(--radius-buttons) var(--radius-buttons) 0;
}

/* ppthub 互链横幅（也用于 ppthub 页，保持同名） */
.hub-banner {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin: 0 auto var(--spacing-32); max-width: 760px;
  background: rgba(26, 51, 0, .08); border: 1px solid rgba(26, 51, 0, .3);
  border-radius: var(--radius-cards); padding: 14px 18px;
  font-size: 14px; color: var(--color-moon-mist);
}
.hub-banner a { color: var(--color-ice-highlight); font-weight: 600; text-decoration: none; white-space: nowrap; }
.hub-banner a:hover { text-decoration: underline; }
.hub-banner .hb-ico { color: var(--color-void-violet); display: flex; }

/* ============================================================
   RESKIN OVERRIDE — cream/forest system (aligned with 优卡导航)
   ============================================================ */
.bg-layer, .bg-spotlight { display: none !important; }
::selection { background: rgba(26, 51, 0, 0.15); color: #1a3300; }

/* Floating pill nav */
/* Floating pill nav — 复用 优卡导航 header-pill 样式 */
header:not(.hero) {
  position: sticky; top: 0; z-index: 50;
  padding: 14px 16px 0;
  background: transparent;
}
.header-pill {
  max-width: var(--page-max-width);
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: var(--color-cream-paper);
  border: 1px solid var(--color-pencil-gray);
  border-radius: var(--radius-nav);
  padding: 8px 12px;
  box-shadow: var(--shadow-nav-glow, var(--shadow-glow));
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-body); font-weight: 700; font-size: 18px; color: var(--color-forest-ink); letter-spacing: -0.01em; text-decoration: none; }
.brand .mark { width: 36px; height: 36px; border-radius: 10px; background: var(--color-highlighter-yellow); display: grid; place-items: center; overflow: hidden; border: 1px solid var(--color-forest-ink); flex-shrink: 0; }
.brand .mark img { width: 100%; height: 100%; object-fit: cover; }
.header-actions { display: flex; gap: 12px; align-items: center; flex: 1; justify-content: flex-end; min-width: 0; }
.header-actions .search-wrap { flex: 1; max-width: 420px; margin: 0; padding: 4px 6px 4px 16px; }
.header-actions .search-wrap input { font-size: 14px; min-width: 0; }
.header-actions .search-btn { padding: 6px 16px; }
.search-wrap {
  background: #ffffff;
  border: 1px solid var(--color-pencil-gray);
  border-radius: var(--radius-buttons);
  box-shadow: none;
}
.search-wrap:focus-within { border-color: var(--color-forest-ink); box-shadow: none; }
.search-wrap .ico { color: var(--color-fog-veil); }
.search-wrap input { color: var(--color-forest-ink); }
.search-wrap input::placeholder { color: #8a8a7a; }
.search-count { color: var(--color-fog-veil); }
.search-btn { background: var(--color-forest-ink); color: var(--color-cream-paper); box-shadow: none; }
.search-btn:hover { filter: brightness(1.08); }

.back-link {
  color: var(--color-forest-ink);
  background: #ffffff;
  border: 1px solid var(--color-forest-ink);
  border-radius: var(--radius-buttons);
  box-shadow: none;
}
.back-link:hover { background: var(--color-sticky-note-mint); border-color: var(--color-forest-ink); box-shadow: none; }

/* Hero — forest wordmark + yellow eyebrow badge */
.hero { padding-top: var(--spacing-100); }
.eyebrow {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--color-forest-ink);
  background: var(--color-highlighter-yellow);
  border: 1px solid var(--color-forest-ink);
  border-radius: var(--radius-badges);
  padding: 5px 14px;
  margin-bottom: var(--spacing-24);
}
.eyebrow::before, .eyebrow::after { display: none; }
.hero-wordmark {
  background: none !important;
  -webkit-text-fill-color: var(--color-forest-ink) !important;
  color: var(--color-forest-ink) !important;
  text-shadow: none !important;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.04em;
}
.hero-sub { color: var(--color-moon-mist); }

/* Category panel + pills */
.cat-panel { background: #ffffff; border: 1px solid var(--color-pencil-gray); box-shadow: var(--shadow-subtle); }
.cat-panel-title { color: var(--color-forest-ink); opacity: 0.6; }
.cat-pill { color: var(--color-forest-ink); }
.cat-pill:hover { background: rgba(26, 51, 0, 0.05); color: var(--color-forest-ink); }
.cat-pill.active { background: var(--color-forest-ink); color: var(--color-cream-paper); box-shadow: none; }

/* Term/tip cards as clean white cards */
.term-card {
  background: #ffffff;
  border: 1px solid var(--color-pencil-gray);
  border-radius: var(--radius-cards);
  box-shadow: var(--shadow-subtle);
}
.term-card:hover { border-color: var(--color-forest-ink); box-shadow: var(--shadow-subtle), var(--shadow-glow); }
.term-card::after { background: linear-gradient(180deg, rgba(26,51,0,0.04), transparent 40%); }
.term-name { color: var(--color-forest-ink); }
.term-alias { color: var(--color-fog-veil); }
.term-summary { color: var(--color-moon-mist); }
.badge { color: var(--color-forest-ink); background: rgba(26, 51, 0, 0.05); }
.badge-level { background: var(--color-highlighter-yellow); color: var(--color-forest-ink); border: 1px solid var(--color-forest-ink); }
.level-section-title { color: var(--color-forest-ink); }
.level-section-header { border-bottom-color: var(--color-pencil-gray); }
.level-section-count { color: var(--color-fog-veil); background: rgba(26,51,0,0.05); border: 1px solid var(--color-pencil-gray); }
.empty-state { background: #ffffff; border: 1px solid var(--color-pencil-gray); color: var(--color-fog-veil); }

/* Demo surfaces */
.demo-btn { color: var(--color-forest-ink); background: #ffffff; border: 1px solid var(--color-pencil-gray); }
.demo-btn:hover { background: rgba(26, 51, 0, 0.05); }
.demo-btn.active { background: var(--color-forest-ink); color: var(--color-cream-paper); border-color: transparent; box-shadow: none; }
.demo-slider { accent-color: var(--color-forest-ink); }
.demo-mount { background: #faf8f2; border: 1px solid var(--color-pencil-gray); }
.ba-slide { background: #ffffff; border: 1px solid var(--color-pencil-gray); }
.mini-slide { border: 1px solid var(--color-pencil-gray); }
.related-chip { color: var(--color-forest-ink); background: #ffffff; border: 1px solid var(--color-pencil-gray); }
.related-chip:hover { background: var(--color-sticky-note-mint); border-color: var(--color-forest-ink); }

/* Modal */
.modal-overlay::before { background: rgba(26, 51, 0, 0.45); }
.modal-card { background: #fcfaf5; border: 1px solid var(--color-pencil-gray); color: var(--color-forest-ink); }
.modal-close { background: rgba(26,51,0,0.06); border: 1px solid var(--color-pencil-gray); color: var(--color-forest-ink); }
.modal-close:hover { background: rgba(26,51,0,0.12); }
.modal-nav { z-index: 200; }
.modal-nav:hover:not(:disabled) { background: var(--color-sticky-note-mint); border-color: var(--color-forest-ink); color: var(--color-forest-ink); box-shadow: 0 4px 14px rgba(0,0,0,.15); }
.modal-title { color: var(--color-forest-ink); }
.modal-alias { color: var(--color-fog-veil); }
.modal-detail { color: var(--color-forest-ink); }
.modal-scenario { color: var(--color-moon-mist); }
.modal-section h4 { color: var(--color-terracotta); }
.modal-lead { color: var(--color-forest-ink); background: rgba(255,233,92,0.18); border-left: 3px solid var(--color-highlighter-yellow); }
.modal-pitfall .modal-pit { color: var(--color-moon-mist); background: rgba(203,85,33,0.10); border-left: 3px solid var(--color-terracotta); }
.modal-kbd { color: var(--color-forest-ink); }
.modal-check li { color: var(--color-moon-mist); }
.modal-ba, .modal-extra { color: var(--color-forest-ink); }
.ba-tag.before { color: var(--color-terracotta); background: rgba(203,85,33,0.12); border: 1px solid rgba(203,85,33,0.35); }
.ba-tag.after  { color: var(--color-forest-ink); background: rgba(168,229,229,0.30); border: 1px solid rgba(168,229,229,0.7); }

/* Footer */
.site-footer { border-top-color: var(--color-pencil-gray); color: var(--color-fog-veil); }
.site-footer strong { color: var(--color-forest-ink); }

/* ppthub-specific extras */
.tip-box { color: var(--color-moon-mist); background: rgba(255,233,92,0.12); border-left: 3px solid var(--color-highlighter-yellow); }
.step-item { background: #ffffff; border: 1px solid var(--color-pencil-gray); }
.step-item.active { border-color: var(--color-forest-ink); background: rgba(26,51,0,0.05); }
.step-num { background: var(--color-forest-ink); box-shadow: none; }
.kbd { color: var(--color-forest-ink); background: rgba(26,51,0,0.06); border: 1px solid var(--color-pencil-gray); }
.ba-slider .ba-handle { background: var(--color-forest-ink); }
.ba-slider .ba-handle::after { background: var(--color-forest-ink); border: 1px solid var(--color-pencil-gray); }