/* ============================================================
   中国梦 · Chinese Dream — base.css
   变量 / 重置 / 排版 / 通用组件
   ============================================================ */

:root {
  --ink: #06080c;
  --ink-2: #0b0f16;
  --ink-3: #121826;
  --paper: #f3ede1;
  --paper-dim: #c9c2b4;
  --red: #c8102e;
  --red-bright: #ff2d46;
  --red-deep: #7a0a1c;
  --gold: #d9a441;
  --gold-light: #f2d189;
  --jade: #2e8b7a;
  --line: rgba(217, 164, 65, 0.18);
  --line-soft: rgba(243, 237, 225, 0.09);

  --f-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --f-serif: "Songti SC", "Noto Serif SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;

  --shadow: 0 24px 70px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --max: 1240px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(1200px 700px at 78% -10%, rgba(200, 16, 46, 0.18), transparent 62%),
    radial-gradient(900px 600px at 8% 12%, rgba(217, 164, 65, 0.10), transparent 60%),
    radial-gradient(1000px 800px at 50% 116%, rgba(46, 139, 122, 0.10), transparent 65%),
    linear-gradient(180deg, #06080c 0%, #080b12 40%, #06080c 100%);
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.30'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.9;
}

main,
.site-header,
.site-footer { position: relative; z-index: 2; }

h1, h2, h3, h4 {
  margin: 0 0 0.6em;
  font-family: var(--f-serif);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(2.2rem, 6vw, 4.6rem); }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.9rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.5rem); }

p { margin: 0 0 1em; color: var(--paper-dim); }

a {
  color: var(--gold-light);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
a:hover { color: #fff; }

::selection { background: rgba(200, 16, 46, 0.55); color: #fff; }

img, svg, canvas { max-width: 100%; }

/* ---------- 通用容器 ---------- */
.wrap {
  width: min(100% - 2.6rem, var(--max));
  margin-inline: auto;
}

.section {
  padding: clamp(4rem, 9vw, 8rem) 0;
  position: relative;
}

.section--tight { padding: clamp(2.6rem, 6vw, 4.4rem) 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-size: 0.78rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.1rem;
}
.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold));
}

.lead {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: #ded7c9;
  max-width: 62ch;
}

.muted { color: rgba(243, 237, 225, 0.5); }
.small { font-size: 0.85rem; }

.gold { color: var(--gold-light); }
.red { color: var(--red-bright); }

/* ---------- 文字特效 ---------- */
.grad-text {
  background: linear-gradient(100deg, #fff 0%, var(--gold-light) 26%, var(--red-bright) 52%, var(--gold-light) 78%, #fff 100%);
  background-size: 260% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: text-sweep 9s linear infinite;
}

.stroke-text {
  color: transparent;
  -webkit-text-stroke: 1px rgba(217, 164, 65, 0.55);
}

/* ---------- 按钮 ---------- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--paper);
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), background 0.35s var(--ease);
  backdrop-filter: blur(8px);
}
.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, transparent 20%, rgba(255, 255, 255, 0.22) 50%, transparent 80%);
  transform: translateX(-120%);
  transition: transform 0.7s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: rgba(217, 164, 65, 0.6); }
.btn:hover::after { transform: translateX(120%); }

.btn--primary {
  background: linear-gradient(120deg, var(--red-deep), var(--red) 55%, #e0394f);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: 0 18px 45px -18px rgba(200, 16, 46, 0.95);
  color: #fff;
}

.btn--ghost { background: transparent; }

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: 1.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.012));
  backdrop-filter: blur(10px);
  transition: transform 0.5s var(--ease), border-color 0.5s var(--ease), box-shadow 0.5s var(--ease);
  overflow: hidden;
  will-change: transform;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(420px 220px at var(--mx, 50%) var(--my, 0%), rgba(217, 164, 65, 0.14), transparent 70%);
  opacity: 0;
  transition: opacity 0.5s var(--ease);
  pointer-events: none;
}
.card:hover { border-color: rgba(217, 164, 65, 0.36); box-shadow: 0 30px 70px -40px rgba(200, 16, 46, 0.6); }
.card:hover::before { opacity: 1; }

.card h3 { margin-bottom: 0.5rem; }
.card p:last-child { margin-bottom: 0; }

.card__index {
  font-family: var(--f-serif);
  font-size: 0.8rem;
  letter-spacing: 0.28em;
  color: var(--gold);
  opacity: 0.7;
  display: block;
  margin-bottom: 0.9rem;
}

/* ---------- 网格 ---------- */
.grid { display: grid; gap: 1.15rem; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 分隔线 ---------- */
.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
  margin: 0;
}

/* ---------- 表格 ---------- */
.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.tbl th, .tbl td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}
.tbl th {
  color: var(--gold);
  font-weight: 500;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  text-transform: uppercase;
}
.tbl tr:hover td { background: rgba(255, 255, 255, 0.025); }

/* ---------- 无障碍 ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 620px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}