/* 沉思波·大衍实验室 —— dayan.chensibo.cn
   设计语言对齐现役官网 chensibo.cn：深色系（#0b1220 / #0b2a66）+ 主蓝 #1677ff
   + 青 #0d9488 + 金 #d4af37；衬线做展示字（呼应《易》出处），无外部字体与外部资源。
   2026-10-08 */

:root {
  --bg: #0b1220;
  --bg-deep: #070c16;
  --bg-panel: #101a2e;
  --bg-panel-2: #132040;
  --ink: #e9eef8;
  --ink-2: #b9c4d8;
  --ink-3: #8794ad;
  --line: rgba(146, 164, 200, .18);
  --line-strong: rgba(146, 164, 200, .34);

  --blue: #1677ff;
  --blue-2: #4096ff;
  --blue-dim: rgba(22, 119, 255, .14);
  --teal: #0d9488;
  --teal-dim: rgba(13, 148, 136, .16);
  --gold: #d4af37;
  --gold-dim: rgba(212, 175, 55, .14);

  --font-display: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  --font-latin: "Space Grotesk", "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 14px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(22, 119, 255, .22), transparent 60%),
    radial-gradient(760px 480px at 6% 4%, rgba(13, 148, 136, .14), transparent 62%),
    linear-gradient(180deg, #0b1220 0%, #0a1020 42%, #070c16 100%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-2); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

img { max-width: 100%; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶栏 ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(12px);
  background: rgba(7, 12, 22, .78);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap { display: flex; align-items: center; gap: 20px; height: 64px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand svg { display: block; }
.brand .cn { font-family: var(--font-display); font-size: 19px; letter-spacing: .06em; line-height: 1.1; }
.brand .en {
  font-family: var(--font-latin); font-size: 10.5px; letter-spacing: .34em;
  color: var(--ink-3); text-transform: uppercase;
}
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 7px 14px; border-radius: 999px; color: var(--ink-2);
  font-size: 14.5px; letter-spacing: .02em;
}
.nav a:hover { color: var(--ink); background: rgba(255, 255, 255, .06); text-decoration: none; }
.nav a[aria-current="page"] { color: #fff; background: var(--blue-dim); box-shadow: inset 0 0 0 1px rgba(22, 119, 255, .45); }
.nav .cta {
  background: var(--blue); color: #fff; margin-left: 8px;
  box-shadow: 0 6px 18px rgba(22, 119, 255, .28);
}
.nav .cta:hover { background: var(--blue-2); }

/* ---------- 通用节 ---------- */
main { display: block; }
.section { padding: 76px 0; }
.section + .section { border-top: 1px solid var(--line); }
.section.tight { padding: 56px 0; }

.eyebrow {
  font-family: var(--font-latin); font-size: 12px; letter-spacing: .28em;
  text-transform: uppercase; color: var(--blue-2); margin: 0 0 14px;
}
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: .02em; }
h1 { font-size: clamp(40px, 6.4vw, 68px); line-height: 1.12; margin: 0 0 18px; }
h2 { font-size: clamp(26px, 3.4vw, 34px); line-height: 1.3; margin: 0 0 12px; }
h3 { font-size: 19px; line-height: 1.5; margin: 0 0 8px; }
.lead { font-size: clamp(16px, 1.9vw, 18.5px); color: var(--ink-2); max-width: 62ch; }
.muted { color: var(--ink-3); }
.small { font-size: 13.5px; line-height: 1.7; }
.center { text-align: center; }
.center .lead { margin-left: auto; margin-right: auto; }

.section-head { margin-bottom: 34px; }
.section-head .lead { margin-top: 8px; }

/* ---------- 徽章 ---------- */
.badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.badge {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 5px 12px; border-radius: 999px; font-size: 13px; line-height: 1.6;
  border: 1px solid var(--line-strong); color: var(--ink-2);
  background: rgba(255, 255, 255, .04);
}
.badge b { color: var(--ink); font-weight: 600; }
.badge.gold { border-color: rgba(212, 175, 55, .5); background: var(--gold-dim); color: #f0dfa8; }
.badge.blue { border-color: rgba(22, 119, 255, .5); background: var(--blue-dim); color: #bcd7ff; }
.badge.teal { border-color: rgba(13, 148, 136, .55); background: var(--teal-dim); color: #9be3d8; }
.badge.plain { color: var(--ink-3); }
.dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; flex: none; }

.status {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; border-radius: 999px; font-size: 13.5px;
  border: 1px dashed rgba(212, 175, 55, .55); background: var(--gold-dim); color: #f0dfa8;
}

/* ---------- 卡 ---------- */
.grid { display: grid; gap: 20px; }
.grid.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.c4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  position: relative; padding: 26px 24px 24px; border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(19, 32, 64, .82), rgba(16, 26, 46, .72));
  border: 1px solid var(--line);
}
.card:hover { border-color: var(--line-strong); }
.card .tag {
  font-family: var(--font-latin); font-size: 11px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--ink-3); display: block; margin-bottom: 10px;
}
.card p { color: var(--ink-2); margin: 0 0 10px; font-size: 15px; }
.card .foot { margin-top: 14px; font-size: 13.5px; color: var(--ink-3); }
.card.accent-blue { box-shadow: inset 0 0 0 1px rgba(22, 119, 255, .28), 0 18px 40px -28px rgba(22, 119, 255, .8); }
.card.accent-gold { box-shadow: inset 0 0 0 1px rgba(212, 175, 55, .3); }
.card.accent-teal { box-shadow: inset 0 0 0 1px rgba(13, 148, 136, .34); }

/* ---------- 首屏 ---------- */
.hero { padding: 92px 0 74px; position: relative; overflow: hidden; }
.hero .kicker {
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px;
  font-size: 13px; letter-spacing: .06em; color: var(--ink-2);
  border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .05);
  padding: 6px 14px; border-radius: 999px;
}
.hero .quote {
  font-family: var(--font-display); font-size: clamp(17px, 2.2vw, 21px);
  color: var(--ink-2); border-left: 3px solid var(--gold); padding-left: 16px;
  margin: 26px 0 30px; max-width: 46ch; line-height: 1.9;
}
.hero .quote small { display: block; font-family: var(--font-sans); font-size: 12.5px; color: var(--ink-3); margin-top: 6px; letter-spacing: .04em; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 999px; font-size: 15px;
  border: 1px solid transparent; cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--blue); color: #fff; box-shadow: 0 12px 30px -12px rgba(22, 119, 255, .9); }
.btn.primary:hover { background: var(--blue-2); }
.btn.ghost { border-color: var(--line-strong); color: var(--ink); background: rgba(255, 255, 255, .04); }
.btn.ghost:hover { border-color: var(--blue); color: #fff; }

.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 46px; }
.stat {
  padding: 20px 18px; border-radius: 12px; background: rgba(255, 255, 255, .035);
  border: 1px solid var(--line);
}
.stat .n {
  font-family: var(--font-latin); font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 600; color: #fff; line-height: 1.2; letter-spacing: -.01em;
}
.stat .n em { font-style: normal; font-size: .5em; color: var(--ink-3); margin-left: 4px; }
.stat .k { font-size: 13px; color: var(--ink-3); margin-top: 6px; }

/* ---------- 表 ---------- */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(16, 26, 46, .6); }
table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 640px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); }
thead th {
  font-family: var(--font-latin); font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-3); background: rgba(255, 255, 255, .04); white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(22, 119, 255, .06); }
td.num { font-family: var(--font-latin); color: var(--ink); white-space: nowrap; }
td .zh { color: var(--ink); }
td .en { color: var(--ink-3); font-size: 12.5px; }
tr.total td { background: rgba(212, 175, 55, .08); font-weight: 600; color: #f0dfa8; }

/* ---------- 引文 / 提示 ---------- */
.quote-block {
  border: 1px solid rgba(212, 175, 55, .4); background: var(--gold-dim);
  border-radius: var(--radius); padding: 30px 30px 24px;
}
.quote-block .txt {
  font-family: var(--font-display); font-size: clamp(19px, 2.6vw, 25px);
  line-height: 2; color: #f6ead0; margin: 0;
}
.quote-block .src { margin-top: 14px; font-size: 13px; color: #d8c893; letter-spacing: .06em; }

.note {
  border: 1px solid var(--line-strong); border-left: 3px solid var(--blue);
  background: rgba(22, 119, 255, .08); border-radius: 10px;
  padding: 16px 20px; color: var(--ink-2); font-size: 14.5px;
}
.note.warn { border-left-color: var(--gold); background: var(--gold-dim); }
.note strong { color: var(--ink); }

.legal {
  border: 1px solid var(--line); border-radius: 10px; background: rgba(255, 255, 255, .035);
  padding: 18px 20px; font-family: var(--font-mono); font-size: 13px; line-height: 1.85;
  color: var(--ink-2); overflow-x: auto; white-space: pre-wrap; word-break: break-word;
}

ol.steps { counter-reset: s; list-style: none; padding: 0; margin: 22px 0 0; }
ol.steps li {
  position: relative; padding: 0 0 22px 44px; border-left: 1px solid var(--line);
  margin-left: 15px;
}
ol.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }
ol.steps li::before {
  counter-increment: s; content: counter(s);
  position: absolute; left: -15px; top: 0; width: 30px; height: 30px; border-radius: 50%;
  background: var(--bg-panel-2); border: 1px solid var(--line-strong); color: var(--blue-2);
  font-family: var(--font-latin); font-size: 13.5px; display: flex; align-items: center; justify-content: center;
}
ol.steps h3 { margin-bottom: 4px; }
ol.steps p { margin: 0; color: var(--ink-2); font-size: 15px; }

ul.plain { list-style: none; padding: 0; margin: 14px 0 0; }
ul.plain li { padding: 8px 0 8px 24px; position: relative; color: var(--ink-2); font-size: 15px; border-bottom: 1px dashed var(--line); }
ul.plain li:last-child { border-bottom: none; }
ul.plain li::before { content: "◇"; position: absolute; left: 2px; color: var(--teal); }
ul.plain li b, ul.plain li strong { color: var(--ink); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip {
  font-family: var(--font-mono); font-size: 12.5px; padding: 4px 10px;
  border-radius: 6px; background: rgba(255, 255, 255, .05);
  border: 1px solid var(--line); color: var(--ink-2);
}

/* ---------- 页脚 ---------- */
.site-foot {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(7, 12, 22, .2), rgba(7, 12, 22, .9));
  padding: 48px 0 40px; margin-top: 20px;
}
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 28px; }
.foot-grid h4 {
  font-family: var(--font-latin); font-size: 11.5px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 12px; font-weight: 600;
}
.foot-grid ul { list-style: none; margin: 0; padding: 0; }
.foot-grid li { margin-bottom: 8px; font-size: 14px; }
.foot-grid a { color: var(--ink-2); }
.foot-grid a:hover { color: var(--blue-2); }
.mit-line {
  margin-top: 30px; padding-top: 22px; border-top: 1px solid var(--line);
  font-size: 12.5px; line-height: 1.9; color: var(--ink-3);
}
.mit-line code { font-family: var(--font-mono); color: var(--ink-2); word-break: break-all; }
.icp { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 14px; font-size: 12.5px; color: var(--ink-3); }
.icp a { color: var(--ink-3); text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 响应 ---------- */
@media (max-width: 960px) {
  .grid.c4, .grid.c3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .section { padding: 56px 0; }
  .hero { padding: 64px 0 52px; }
  .grid.c4, .grid.c3, .grid.c2 { grid-template-columns: minmax(0, 1fr); }
  .foot-grid { grid-template-columns: 1fr; }
  .site-head .wrap { height: auto; padding-top: 12px; padding-bottom: 12px; flex-wrap: wrap; }
  .nav { margin-left: 0; width: 100%; flex-wrap: wrap; }
  .nav .cta { margin-left: 0; }
}