/* ========== 基础重置 ========== */
*,*::before,*::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

:root {
  --bg-0: #0b0d12;
  --bg-1: #11141b;
  --bg-2: #161a23;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e8ecf3;
  --text-dim: #a5adba;
  --text-faint: #6e7686;
  --accent: #7c9cff;
  --accent-2: #b18cff;
  --danger: #ff6b6b;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-1: 0 1px 2px rgba(0,0,0,.18), 0 8px 24px rgba(0,0,0,.28);
  --shadow-2: 0 1px 2px rgba(0,0,0,.2), 0 18px 60px rgba(0,0,0,.45);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
  --t-fast: 180ms cubic-bezier(.4,.0,.2,1);
  --t-med: 320ms cubic-bezier(.4,.0,.2,1);
}

html[data-theme='light'] {
  --bg-0: #f4f6fb;
  --bg-1: #ffffff;
  --bg-2: #fafbff;
  --surface: rgba(255, 255, 255, 0.7);
  --surface-2: rgba(255, 255, 255, 0.9);
  --border: rgba(15, 22, 41, 0.08);
  --border-strong: rgba(15, 22, 41, 0.16);
  --text: #0f1629;
  --text-dim: #4a5366;
  --text-faint: #8a93a4;
  --shadow-1: 0 1px 2px rgba(15,22,41,.05), 0 8px 24px rgba(15,22,41,.08);
  --shadow-2: 0 1px 2px rgba(15,22,41,.06), 0 18px 60px rgba(15,22,41,.12);
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background var(--t-med), color var(--t-med);
}

/* ========== 背景层 ========== */
.bg {
  position: fixed; inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}
#bg-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  display: block;
}
.bg-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(124, 156, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 85% 10%, rgba(177, 140, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 50% 110%, rgba(67, 206, 162, 0.12), transparent 60%);
  transition: opacity var(--t-med);
}
html[data-theme='light'] .bg-gradient { opacity: 0.55; }
.bg-noise {
  position: absolute; inset: 0;
  opacity: 0.04;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ========== 顶部导航条 ========== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in oklab, var(--bg-0) 70%, transparent);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; gap: 24px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text);
  font-weight: 700; font-size: 16px;
  letter-spacing: 0.5px;
}
.brand-mark {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white; font-size: 14px;
  box-shadow: 0 4px 14px rgba(124, 156, 255, 0.4);
}
.topnav {
  display: flex; gap: 4px;
  margin-left: 8px;
  flex: 1;
}
.topnav a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--t-fast), background var(--t-fast);
}
.topnav a:hover { color: var(--text); background: var(--surface); }
.topbar-tools { display: flex; gap: 6px; }
.icon-btn {
  display: inline-grid; place-items: center;
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--t-fast);
}
.icon-btn:hover { color: var(--text); background: var(--surface-2); border-color: var(--border-strong); }
.menu-toggle { display: none; }

@media (max-width: 720px) {
  .topnav { display: none; }
  .menu-toggle { display: inline-grid; }
  .topnav.open {
    display: flex;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column;
    padding: 12px;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
  }
  .topnav.open a { padding: 12px; }
}

/* ========== 主容器 ========== */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 56px 24px 96px;
}

/* ========== Hero ========== */
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 56px;
}
.hero-eyebrow {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 1px;
  margin: 0 0 12px;
  min-height: 1.6em;
}
.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.1;
  margin: 0 0 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex; flex-direction: column; gap: 4px;
}
.hero-title span:first-child { color: var(--text-dim); font-weight: 500; font-size: 0.6em; }
.hero-gradient {
  background: linear-gradient(120deg, #7c9cff 0%, #b18cff 50%, #ff9ed2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 0 28px;
}
.hero-desc strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px;
  border-radius: 12px;
  font-size: 14px; font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  box-shadow: 0 8px 24px rgba(124, 156, 255, 0.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 28px rgba(124, 156, 255, 0.45); }
.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface-2); border-color: var(--border-strong); }

/* Hero 卡片 */
.hero-card {
  position: relative;
  padding: 28px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  backdrop-filter: blur(8px);
}
.card-glow {
  position: absolute;
  inset: -50%;
  background: conic-gradient(from 0deg, transparent, rgba(124, 156, 255, 0.4), transparent 40%);
  animation: spin 12s linear infinite;
  opacity: 0.35;
  pointer-events: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

.clock { position: relative; text-align: center; }
.clock-time {
  font-size: 44px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  background: linear-gradient(135deg, #7c9cff, #b18cff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.clock-date {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-dim);
}
.card-divider {
  height: 1px;
  margin: 20px 0;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}
.card-stats {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 24px; font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 12px; color: var(--text-faint); letter-spacing: 0.5px; }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 32px; }
}

/* ========== 搜索 ========== */
.search-wrap { margin-bottom: 36px; }
.search-box {
  position: relative;
  display: flex; align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0 14px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--accent) 18%, transparent);
}
.search-icon { color: var(--text-faint); flex-shrink: 0; }
#search {
  flex: 1;
  padding: 14px 12px;
  background: transparent;
  border: none; outline: none;
  color: var(--text);
  font-size: 15px;
  font-family: inherit;
}
#search::placeholder { color: var(--text-faint); }
.search-kbd {
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 12px;
  font-family: inherit;
}

/* ========== 区块标题 ========== */
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 20px;
}
.section-head h2 {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.section-tag {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--text-faint);
}

/* ========== 卡片网格 ========== */
.sites { margin-bottom: 64px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.card {
  position: relative;
  display: flex; align-items: center; gap: 14px;
  padding: 18px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: transform var(--t-fast), border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 50%), rgba(124, 156, 255, 0.08), transparent 40%);
  opacity: 0;
  transition: opacity var(--t-fast);
  pointer-events: none;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: var(--surface-2);
  box-shadow: var(--shadow-1);
}
.card:hover::before { opacity: 1; }
.card-icon {
  flex-shrink: 0;
  display: grid; place-items: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: white;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}
.card-body { flex: 1; min-width: 0; }
.card-body h3 {
  margin: 0 0 2px;
  font-size: 15px;
  font-weight: 600;
}
.card-body p {
  margin: 0;
  font-size: 12px;
  color: var(--text-faint);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.card-body code {
  font-size: 11px;
  padding: 1px 5px;
  background: var(--surface-2);
  border-radius: 4px;
}
.card-arrow {
  color: var(--text-faint);
  font-size: 14px;
  transition: transform var(--t-fast), color var(--t-fast);
}
.card:hover .card-arrow {
  transform: translate(2px, -2px);
  color: var(--text);
}
.card-placeholder {
  border-style: dashed;
  cursor: default;
  opacity: 0.6;
}
.card-placeholder:hover { transform: none; box-shadow: none; background: var(--surface); }
.empty {
  text-align: center;
  padding: 32px;
  color: var(--text-faint);
  font-size: 14px;
}

/* ========== 关于 ========== */
.about-card {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}
.about-card p { margin: 0 0 12px; color: var(--text-dim); }
.about-card p:last-of-type { margin-bottom: 20px; }
.about-social { display: flex; gap: 8px; }
.about-social a {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: all var(--t-fast);
}
.about-social a:hover { color: var(--text); border-color: var(--border-strong); transform: translateY(-2px); }

/* ========== Footer ========== */
.footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
}
.footer p { margin: 4px 0; }
.footer-tip { font-size: 12px; opacity: 0.7; }

/* ========== 返回顶部 ========== */
.back-top {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 42px; height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: white;
  border: none;
  cursor: pointer;
  display: grid; place-items: center;
  box-shadow: 0 8px 24px rgba(124, 156, 255, 0.4);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity var(--t-med), transform var(--t-med);
  z-index: 40;
}
.back-top.show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-top:hover { transform: translateY(-2px); }

/* ========== 入场动画 ========== */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  animation: fadeIn 600ms cubic-bezier(.2,.7,.2,1) forwards;
}
@keyframes fadeIn {
  to { opacity: 1; transform: translateY(0); }
}

/* ========== 响应式微调 ========== */
@media (max-width: 560px) {
  .main { padding: 32px 16px 64px; }
  .topbar-inner { padding: 12px 16px; }
  .hero { margin-bottom: 36px; }
  .grid { grid-template-columns: 1fr; }
  .clock-time { font-size: 36px; }
}