/* 共享基础样式：设计变量、页面重置、导航、页脚、主题切换和背景画布。 */
:root {
  --bg: #fbfaf8;
  --bg-rgb: 251, 250, 248;
  --mono: ui-monospace, "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
  --ink: #22201c;
  --ink-soft: #56524a;
  --muted: #9a948a;
  --line: #e8e4dc;
  --accent: #b3400f;
  --accent-rgb: 179, 64, 15;
  --ink-rgb: 34, 32, 28;
  --code-bg: #f4f1e9;
  --inline-bg: rgba(179, 64, 15, 0.07);
  /* Shiki 代码高亮：token 全部收敛回设计三色，明暗随主题变量自动切换 */
  --shiki-foreground: var(--ink-soft);
  --shiki-background: var(--code-bg);
  --shiki-token-constant: var(--ink-soft);
  --shiki-token-string: var(--ink-soft);
  --shiki-token-comment: var(--muted);
  --shiki-token-keyword: var(--accent);
  --shiki-token-parameter: var(--ink-soft);
  --shiki-token-function: var(--ink-soft);
  --shiki-token-string-expression: var(--ink-soft);
  --shiki-token-punctuation: var(--ink-soft);
  --shiki-token-link: var(--ink-soft);
}
[data-theme="dark"] {
  --bg: #141311;
  --bg-rgb: 20, 19, 17;
  --ink: #e8e3d8;
  --ink-soft: #b5aea0;
  --muted: #726c61;
  --line: #292621;
  --accent: #d9703c;
  --accent-rgb: 217, 112, 60;
  --ink-rgb: 232, 227, 216;
  --code-bg: #1c1a16;
  --inline-bg: rgba(217, 112, 60, 0.13);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.8 -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  transition: background 0.4s ease, color 0.4s ease;
}
a { color: inherit; text-decoration: none; }

#bg { position: fixed; inset: 0; z-index: 0; display: block; }
.wash {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(ellipse 920px 620px at 16% -8%, rgba(var(--accent-rgb), 0.13), transparent 62%),
    radial-gradient(ellipse 760px 540px at 90% 110%, rgba(var(--accent-rgb), 0.09), transparent 60%);
}
header, main, footer { position: relative; z-index: 1; }

.wrap { max-width: 680px; margin: 0 auto; padding: 0 24px; }

.nav { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.nav .name { font-weight: 700; letter-spacing: 1px; }
.nav nav { display: flex; gap: 28px; font-size: 14px; align-items: center; }
.nav nav a { color: var(--ink-soft); transition: color 0.25s; }
.nav nav a:hover { color: var(--accent); }
#theme-toggle {
  border: 1px solid var(--line);
  background: none;
  color: var(--ink-soft);
  width: 32px; height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: border-color 0.3s, color 0.3s, transform 0.3s;
}
#theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(20deg);
}
#theme-toggle svg { width: 15px; height: 15px; }
#theme-toggle .moon { display: none; }
[data-theme="dark"] #theme-toggle .sun { display: none; }
[data-theme="dark"] #theme-toggle .moon { display: block; }

footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 13px; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }