/* 砚 Yan —— 墨 / 宣纸 / 朱砂，三色封顶（与 assets/logo 的色板一致） */
:root {
  --ink: #1a1a1a;
  --ink-2: #2b2b2b;
  --paper: #f5f1e6;
  --paper-2: #ece5d5;
  --cinnabar: #c8322b;
  --muted: #6b6459;
  --line: #d9d1be;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", "SFMono-Regular", monospace;
  --sans: -apple-system, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

code, pre { font-family: var(--mono); }

/* ---------------------------------------------------------------- 导航 */
.nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(20px, 5vw, 64px);
  background: rgba(245, 241, 230, .86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; text-decoration: none; letter-spacing: .04em; }
.brand em { font-style: normal; font-weight: 400; color: var(--muted); margin-left: 4px; }
.nav nav { display: flex; align-items: center; gap: clamp(12px, 2vw, 28px); font-size: 14px; }
.nav nav a { text-decoration: none; color: var(--muted); }
.nav nav a:hover { color: var(--ink); }
.nav .gh { border: 1px solid var(--ink); border-radius: 999px; padding: 4px 14px; color: var(--ink); }
.nav .gh:hover { background: var(--ink); color: var(--paper); }

/* ---------------------------------------------------------------- 首屏 */
.hero { padding: clamp(48px, 9vw, 120px) clamp(20px, 5vw, 64px) 0; text-align: center; }
.hero .mark { width: clamp(96px, 14vw, 132px); height: auto; filter: drop-shadow(0 18px 34px rgba(26,26,26,.16)); }
.hero h1 {
  margin: 28px 0 18px;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.18;
  letter-spacing: .02em;
}
.lede {
  max-width: 41em; margin: 0 auto;
  font-size: clamp(15px, 1.5vw, 18px);
  color: var(--ink-2);
}
.lede strong { border-bottom: 2px solid var(--cinnabar); padding-bottom: 1px; }
.cta { display: flex; gap: 14px; justify-content: center; margin: 36px 0 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 11px 26px; border-radius: 999px;
  border: 1px solid var(--ink); text-decoration: none; font-size: 15px;
  transition: transform .15s ease, background .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--ink); color: var(--paper); }
.btn.primary:hover { background: var(--cinnabar); border-color: var(--cinnabar); }
.ver { color: var(--muted); font-size: 13px; }

/* ---------------------------------------------------------------- 特点 */
.grid {
  display: grid; gap: 1px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  background: var(--line);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  margin: clamp(56px, 8vw, 96px) 0 0;
}
.grid article { background: var(--paper); padding: clamp(24px, 3.4vw, 40px); }
.grid h3 { margin: 0 0 10px; font-size: 17px; letter-spacing: .01em; }
.grid p { margin: 0; color: var(--muted); font-size: 14.5px; }
/* 行内代码：只作用在**不在 <pre> 里**的 code。
   直接写 `.split code` 会给代码块里的 <code> 套上浅色底 ——
   pre 里的字本来就是浅色，叠上去整块就看不清了。 */
.grid :not(pre) > code, .split :not(pre) > code, .status :not(pre) > code {
  background: var(--paper-2); border-radius: 4px; padding: 1px 5px; font-size: .92em;
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; }

/* ---------------------------------------------------------------- 两栏 */
.split {
  display: grid; gap: clamp(24px, 4vw, 56px);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  align-items: center;
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }
.split h2 { margin: 0 0 14px; font-size: clamp(22px, 2.6vw, 30px); }
.split p { margin: 0 0 10px; color: var(--ink-2); }
.muted { color: var(--muted) !important; font-size: 14px; }

pre {
  margin: 0; padding: 22px 24px; overflow-x: auto;
  background: var(--ink); color: #e9e4d6; border-radius: 14px;
  font-size: 13.5px; line-height: 1.7;
  box-shadow: 0 22px 44px rgba(26,26,26,.18);
}
pre .c { color: #8a8474; }
pre .k { color: #f0a79a; }
pre .f { color: #f6e0a8; }
pre .n { color: #a9c9e8; }
pre .s { color: #b7d6a8; }

/* ---------------------------------------------------------------- 大代码块 */
.code-hero { padding: clamp(40px, 6vw, 72px) clamp(20px, 5vw, 64px); }
.code-hero pre { max-width: 880px; margin: 0 auto; font-size: 14px; }

/* ---------------------------------------------------------------- 进度 */
.status { padding: clamp(48px, 7vw, 88px) clamp(20px, 5vw, 64px); border-top: 1px solid var(--line); }
.status h2 { margin: 0 0 18px; font-size: clamp(20px, 2.4vw, 28px); }
.status ul { max-width: 62em; margin: 0; padding-left: 1.1em; }
.status li { margin: 8px 0; color: var(--ink-2); }
.status b { color: var(--ink); }

/* ---------------------------------------------------------------- 页脚 */
footer {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  padding: 32px 20px 48px;
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13.5px;
}
footer a { text-decoration: none; border-bottom: 1px solid var(--line); }
footer a:hover { color: var(--cinnabar); border-color: var(--cinnabar); }