/* ═══════════════════════════════════════════════════════
   AI 趋势热榜 — Light Dashboard Theme
   ═══════════════════════════════════════════════════════ */

/* ── Design Tokens ───────────────────────── */
:root {
  --bg: #f6f8fb;
  --bg-radial: radial-gradient(ellipse 80% 60% at 20% 0%, #eaf1ff 0%, transparent 50%),
               radial-gradient(ellipse 40% 80% at 90% 100%, #f0eaff 0%, transparent 50%),
               var(--bg);
  --panel: #ffffff;
  --panel-hover: #fafbfd;
  --sidebar-bg: rgba(255, 255, 255, 0.78);
  --text: #1a2235;
  --text-secondary: #56627a;
  --text-muted: #8f99b0;
  --line: #e8ecf3;
  --line-light: #f0f2f7;

  --primary: #4f7df3;
  --primary-soft: #edf3ff;
  --primary-glow: rgba(79, 125, 243, 0.18);
  --accent-rose: #f24e6c;
  --accent-amber: #f5932e;
  --accent-teal: #1db4a8;
  --accent-purple: #7c5cf0;

  --bili: #fb5a8d;
  --bili-soft: #fff0f5;
  --weibo: #f5762b;
  --weibo-soft: #fff5ed;
  --douyin: #1e1e1e;
  --douyin-soft: #f0f0f0;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 3px rgba(16, 24, 40, 0.04), 0 1px 2px rgba(16, 24, 40, 0.03);
  --shadow-md: 0 4px 16px rgba(16, 24, 40, 0.06), 0 2px 4px rgba(16, 24, 40, 0.03);
  --shadow-lg: 0 12px 32px rgba(16, 24, 40, 0.07), 0 4px 8px rgba(16, 24, 40, 0.04);
  --shadow-xl: 0 20px 48px rgba(16, 24, 40, 0.09), 0 8px 16px rgba(16, 24, 40, 0.04);

  --font-display: "DM Serif Display", Georgia, "Noto Serif SC", serif;
  --font-body: "Inter", "Noto Sans SC", "Microsoft YaHei", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Cascadia Code", "Fira Code", monospace;

  --sidebar-w: 256px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-radial);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── App Shell ───────────────────────────── */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  max-width: 1600px;
  margin: 0 auto;
}

/* ── Sidebar ─────────────────────────────── */
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 28px 20px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 10;
}

.sidebar-top { display: flex; flex-direction: column; gap: 32px; }

/* Brand */
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 6px;
}

.brand-mark {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  border-radius: 14px;
  background: linear-gradient(145deg, #6ca5ff, #4876ff);
  color: #fff;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  font-style: italic;
  box-shadow: 0 8px 24px rgba(79, 125, 243, 0.28);
  flex-shrink: 0;
}

.brand-text { display: flex; flex-direction: column; }
.brand-name { font-size: 16px; font-weight: 700; color: var(--text); letter-spacing: -0.3px; }
.brand-ver { font-size: 11px; color: var(--text-muted); margin-top: 1px; }

/* Nav */
.nav { display: flex; flex-direction: column; gap: 4px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.18s var(--ease-out);
  text-align: left;
  position: relative;
}
.nav-item:hover {
  background: var(--primary-soft);
  color: var(--primary);
}
.nav-item.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}
.nav-item.active::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 20px;
  border-radius: 0 3px 3px 0;
  background: var(--primary);
}

.nav-icon { width: 20px; height: 20px; flex-shrink: 0; }
.nav-label { flex: 1; }

.nav-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.nav-dot.bili { background: var(--bili); }
.nav-dot.weibo { background: var(--weibo); }
.nav-dot.douyin { background: var(--douyin); }

.nav-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 2px 8px;
  border-radius: 10px;
  min-width: 28px;
  text-align: center;
}

/* Sidebar card */
.sidebar-card {
  position: relative;
  overflow: hidden;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #f5f9ff 0%, #ecf3ff 48%, #fafcff 100%);
  border: 1px solid #dce7f9;
}
.sidebar-card h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  position: relative; z-index: 1;
}
.sidebar-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
  position: relative; z-index: 1;
}
.sidebar-card-glow {
  position: absolute;
  inset: -40px -20px;
  background: radial-gradient(ellipse 60% 50% at 30% 60%, rgba(97, 165, 255, 0.18), transparent 60%),
              radial-gradient(ellipse 50% 60% at 80% 20%, rgba(124, 92, 240, 0.1), transparent 60%);
  pointer-events: none;
}

/* ── Main ────────────────────────────────── */
.main {
  padding: 36px 40px 48px;
  min-width: 0;
}

/* ── Topbar ──────────────────────────────── */
.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
  animation: fadeSlideIn 0.6s var(--ease-out) both;
}

.topbar-left h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 3.5vw, 44px);
  font-weight: 700;
  letter-spacing: -1.2px;
  line-height: 1.15;
  color: var(--text);
}
.gradient-text {
  background: linear-gradient(115deg, #5fa8ff 0%, #4876ff 45%, #7c5cf0 85%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.topbar-sub {
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 0.2px;
}

.topbar-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  flex-shrink: 0;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}

.pulse-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #2ecc71;
  box-shadow: 0 0 0 4px rgba(46, 204, 113, 0.15);
  animation: pulse 2s ease-in-out infinite;
}
.pulse-dot.error {
  background: #e74c3c;
  box-shadow: 0 0 0 4px rgba(231, 76, 60, 0.15);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(46, 204, 113, 0.15); }
  50% { box-shadow: 0 0 0 12px rgba(46, 204, 113, 0); }
}

.update-time {
  font-size: 12px;
  color: var(--text-muted);
}
.update-time time { font-weight: 500; color: var(--text-secondary); }

/* ── Toolbar ─────────────────────────────── */
.toolbar {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 200px auto;
  gap: 14px;
  margin-bottom: 28px;
  animation: fadeSlideIn 0.6s var(--ease-out) 0.1s both;
}

.toolbar-search {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 54px;
  padding: 0 16px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s var(--ease-out);
}
.toolbar-search:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--primary-glow);
}
.search-icon {
  width: 20px; height: 20px;
  flex-shrink: 0;
  color: var(--text-muted);
}
.toolbar-search input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text);
}
.toolbar-search input::placeholder { color: var(--text-muted); }
.toolbar-search kbd {
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  flex-shrink: 0;
}

.toolbar-select {
  position: relative;
  display: flex;
  align-items: center;
  height: 54px;
  padding: 0 14px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}
.toolbar-select select {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-secondary);
  appearance: none;
  cursor: pointer;
  padding-right: 20px;
}
.select-chevron {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px; height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}

.toolbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 54px;
  padding: 0 22px;
  border-radius: var(--radius-md);
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm), 0 4px 12px var(--primary-glow);
  transition: all 0.2s var(--ease-out);
}
.toolbar-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md), 0 6px 20px rgba(79, 125, 243, 0.25);
}
.toolbar-btn:active { transform: translateY(0) scale(0.98); }
.btn-icon { width: 18px; height: 18px; }

/* ── Cards Grid ──────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-bottom: 28px;
}

/* ── Rank Card ───────────────────────────── */
.rank-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 22px 20px 16px;
  display: flex;
  flex-direction: column;
  transition: all 0.25s var(--ease-out);
  animation: cardReveal 0.5s var(--ease-out) var(--card-delay, 0.2s) both;
}
.rank-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-platform {
  display: flex;
  align-items: center;
  gap: 10px;
}

.platform-icon {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.platform-icon.bili { background: var(--bili-soft); color: var(--bili); }
.platform-icon.weibo { background: var(--weibo-soft); color: var(--weibo); }
.platform-icon.douyin { background: var(--douyin-soft); color: var(--douyin); }

.card-platform h2 {
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.2px;
}

.card-source {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.card-count {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 8px;
  flex-shrink: 0;
}

/* Rank List */
.rank-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  overflow-y: auto;
  max-height: 520px;
}

.rank-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.15s var(--ease-out);
  text-decoration: none;
  color: inherit;
  min-height: 44px;
}
.rank-item:hover {
  background: var(--panel-hover);
  transform: translateX(3px);
}

.rank-num {
  display: grid; place-items: center;
  width: 22px; height: 22px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
}
.rank-num.r1 { background: var(--accent-rose); color: #fff; }
.rank-num.r2 { background: var(--accent-amber); color: #fff; }
.rank-num.r3 { background: #f7c948; color: #fff; }

.rank-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.rank-meta {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.rank-tag {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 6px;
  letter-spacing: 0.2px;
  white-space: nowrap;
}
.rank-tag.ai-tier1 { background: #ffeaea; color: var(--accent-rose); }
.rank-tag.ai-tier2 { background: #fff3e6; color: var(--accent-amber); }
.rank-tag.hot { background: #fff0f5; color: var(--bili); }
.rank-tag.new { background: #edf3ff; color: var(--primary); }

.rank-heat {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-rose);
  white-space: nowrap;
}
.rank-heat.weibo-heat { color: var(--weibo); }

/* Card empty state */
.card-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

/* Skeleton loading */
.skeleton-item {
  height: 44px;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--bg) 25%, rgba(240,242,247,0.7) 50%, var(--bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.6s ease-in-out infinite;
}
.skeleton-item:nth-child(odd) { animation-delay: 0.1s; }
.skeleton-item:nth-child(even) { animation-delay: 0.2s; }
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Analysis Row ────────────────────────── */
.analysis-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  animation: fadeSlideIn 0.6s var(--ease-out) 0.3s both;
}

.analysis-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 24px;
}

.analysis-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}
.analysis-icon {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 16px;
}
.analysis-head h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

/* Platform stats bars */
.platform-stats { display: flex; flex-direction: column; gap: 16px; }

.stat-bar-wrap {
  display: grid;
  grid-template-columns: 64px 1fr 36px;
  align-items: center;
  gap: 12px;
}
.stat-bar-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}
.stat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.stat-dot.bili { background: var(--bili); }
.stat-dot.weibo { background: var(--weibo); }
.stat-dot.douyin { background: var(--douyin); }

.stat-bar-track {
  height: 8px;
  border-radius: 4px;
  background: var(--bg);
  overflow: hidden;
}
.stat-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s var(--ease-spring);
}
.stat-bar-fill.bili-fill { background: linear-gradient(90deg, var(--bili), #fd8ab3); }
.stat-bar-fill.weibo-fill { background: linear-gradient(90deg, var(--weibo), #f9a568); }
.stat-bar-fill.douyin-fill { background: linear-gradient(90deg, #555, #888); }

.stat-value {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  text-align: right;
}

/* Keyword cloud */
.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.keyword-tag {
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text-secondary);
  transition: all 0.15s var(--ease-out);
  cursor: default;
}
.keyword-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}
.keyword-tag.tier1 {
  border-color: #fdd;
  background: #fff5f5;
  color: var(--accent-rose);
  font-weight: 600;
}
.keyword-tag.tier2 {
  border-color: #ffe8d6;
  background: #fffaf5;
  color: var(--accent-amber);
  font-weight: 600;
}
.keyword-tag.no-match {
  color: var(--text-muted);
  background: var(--bg);
  border-color: var(--line-light);
}

/* ── Animations ──────────────────────────── */
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes cardReveal {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ── Toast ───────────────────────────────── */
.toast {
  position: fixed;
  bottom: 28px;
  right: 28px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lg);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateY(16px);
  transition: all 0.3s var(--ease-out);
  pointer-events: none;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ──────────────────────────── */
@media (max-width: 1180px) {
  :root { --sidebar-w: 80px; }
  .brand-text, .nav-label, .nav-badge, .sidebar-card { display: none; }
  .sidebar { padding: 24px 12px; align-items: center; }
  .nav-item { justify-content: center; padding: 12px; }
  .nav-item.active::before { left: -8px; }
  .brand { justify-content: center; padding: 0; }
}

@media (max-width: 960px) {
  .app { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    flex-direction: row;
    padding: 16px 20px;
    border-right: none;
    border-bottom: 1px solid var(--line);
    gap: 12px;
  }
  .sidebar-top { flex-direction: row; align-items: center; gap: 16px; }
  .nav { flex-direction: row; overflow-x: auto; gap: 8px; }
  .nav-item { white-space: nowrap; width: auto; }
  .nav-item.active::before { display: none; }
  .brand-text, .nav-label, .sidebar-card { display: none; }
  .main { padding: 24px 18px 36px; }
  .cards-grid { grid-template-columns: 1fr; }
  .analysis-row { grid-template-columns: 1fr; }
  .toolbar { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; }
  .topbar-right { align-items: flex-start; }
}

@media (max-width: 640px) {
  .main { padding: 18px 14px 28px; }
  .topbar-left h1 { font-size: 26px; }
  .brand-name { display: none; }
}