:root{
    --bg:#FAF9F5; --bg-soft:#F0EEE6; --card:#FFFFFF; --ink:#1F1E1D; --ink-2:#4E4A40;
    --muted:#8A8578; --line:#E5E1D4; --line-soft:#EDEAE0; --accent:#D97757; --accent-deep:#C05F3F;
    --accent-soft:#F6E3DB; --nav-bg:rgba(250,249,245,.86);
    --ghost-hover-bg:#FFFFFF; --ghost-hover-line:#D8D3C4;
    --btn-solid-bg:#1F1E1D; --btn-solid-fg:#FBFAF7;
    --serif:Georgia,"Times New Roman","Songti SC",STSong,"Noto Serif CJK SC","Noto Serif SC",serif;
    --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue","Noto Sans CJK SC","Microsoft YaHei",sans-serif;
  }
  html[data-theme="dark"]{
    --bg:#262624; --bg-soft:#2E2D2A; --card:#30302E; --ink:#F0EEE6; --ink-2:#C9C4B6;
    --muted:#8F8A7D; --line:#413F39; --line-soft:#383630; --accent:#D97757; --accent-deep:#E08663;
    --accent-soft:rgba(217,119,87,.22); --nav-bg:rgba(38,38,36,.86);
    --ghost-hover-bg:rgba(255,255,255,.06); --ghost-hover-line:#4A4840;
    --btn-solid-bg:#F0EEE6; --btn-solid-fg:#23221E;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased;transition:background-color .25s ease,color .25s ease}
  ::selection{background:var(--accent-soft)}
  a{color:inherit;text-decoration:none}
  .container{max-width:1120px;margin:0 auto;padding:0 28px}
  :where(a,button,summary):focus-visible{outline:2px solid #fff;outline-offset:2px;box-shadow:0 0 0 6px #0b3d91}
  /* 输入框聚焦时不使用全局双线焦点环,由浏览器默认 outline 提供 */
  :where(input,textarea,select):focus-visible{outline:auto}
  .nav-wrap{position:sticky;top:0;z-index:50;background:var(--nav-bg);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line-soft)}
  nav{display:flex;align-items:center;justify-content:space-between;height:68px}
  .brand{display:flex;align-items:center;gap:10px}
  .brand .mark{width:30px;height:30px;flex:none}
  .brand .name{font-family:var(--serif);font-size:19.5px;font-weight:700;letter-spacing:.04em}
  .brand .name em{font-style:normal;color:var(--accent)}
  .nav-links{display:flex;gap:30px;font-size:14.5px;color:var(--ink-2)}
  .nav-links a:hover{color:var(--ink)}
  .nav-actions{display:flex;align-items:center;gap:12px}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;cursor:pointer;transition:all .18s ease;font-family:var(--sans);font-size:14.5px;line-height:1;border:1px solid transparent}
  .btn-ghost{padding:10px 20px;border-color:var(--line);color:var(--ink);background:transparent}
  .btn-ghost:hover{background:var(--ghost-hover-bg);border-color:var(--ghost-hover-line)}
  .btn-dark{padding:11px 21px;background:var(--btn-solid-bg);color:var(--btn-solid-fg)}
  .btn-dark:hover{opacity:.88}
  .theme-toggle{width:40px;height:40px;padding:0;flex:none}
  .theme-toggle svg{width:17px;height:17px}
  .theme-toggle .ic-sun{display:none}
  html[data-theme="dark"] .theme-toggle .ic-moon{display:none}
  html[data-theme="dark"] .theme-toggle .ic-sun{display:block}

  .page-hero{padding:64px 0 20px;text-align:center}
  .page-hero h1{font-family:var(--serif);font-size:clamp(28px,4vw,40px);font-weight:600;letter-spacing:.08em;margin-bottom:12px}
  .page-hero .sub{font-size:13.5px;color:var(--muted);letter-spacing:.06em}
  .page-body{max-width:780px;margin:0 auto;padding:0 28px 20px}
  .notice{border:1px solid var(--line);background:var(--bg-soft);border-radius:14px;padding:14px 18px;font-size:13.5px;color:var(--ink-2);margin:22px 0 8px}
  .notice strong{color:var(--accent-deep)}

  .prose h2{font-family:var(--serif);font-size:19px;font-weight:600;letter-spacing:.04em;margin:36px 0 10px}
  .prose h2 .no{color:var(--accent);margin-right:10px}
  .prose p,.prose li{font-size:14.5px;color:var(--ink-2);margin-bottom:10px}
  .prose ul{padding-left:22px;margin:0 0 12px}
  .prose li{margin-bottom:6px}
  .prose strong{color:var(--ink);font-weight:600}
  .prose .ph{background:var(--accent-soft);border-radius:4px;padding:0 4px}

  footer{border-top:1px solid var(--line-soft);margin-top:80px;padding:36px 0 30px}
  .foot-bar{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:12.5px;color:#A9A498}
  .foot-bar a{color:var(--ink-2)}
  .foot-bar a:hover{color:var(--ink)}
  .foot-links{display:flex;gap:22px;flex-wrap:wrap}

  @media (max-width:960px){.nav-links{display:none}}
  @media (max-width:620px){
    .container,.page-body{padding-left:20px;padding-right:20px}
    nav{gap:10px}
    .brand{min-width:0;gap:7px}
    .brand .mark{width:28px;height:28px}
    .brand .name{font-size:17px;letter-spacing:.01em;white-space:nowrap}
    .nav-actions{gap:8px;flex:none}
    .nav-actions .btn-dark{display:none}
    .nav-actions .btn-ghost:not(.theme-toggle){padding:10px 15px}
    .page-hero{padding:48px 0 20px}
    .page-hero h1{font-size:clamp(28px,8.5vw,36px);letter-spacing:.03em;overflow-wrap:anywhere}
    .page-hero .sub,.notice,.prose,.foot-bar{overflow-wrap:anywhere}
  }
  @media (max-width:430px){
    .container,.page-body{padding-left:16px;padding-right:16px}
    .brand .name{font-size:15.5px}
    .nav-actions .btn-ghost:not(.theme-toggle){padding:10px 13px}
  }
  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto}
    *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}
  }


.link-accent{color:var(--accent-deep);text-decoration:underline;text-underline-offset:3px}

@media (forced-colors: active){
  body,.nav-wrap,.page-body,.notice,.prose{background:Canvas;color:CanvasText;border-color:CanvasText}
  :where(button,.btn){background:ButtonFace;color:ButtonText;border-color:ButtonText}
  :where(.page-hero .sub,.prose p,.prose li,.foot-bar){color:CanvasText}
  :where(a,button):focus-visible{outline:2px solid Highlight!important;outline-offset:2px;box-shadow:none!important}
  .notice,.prose .ph{border:1px solid CanvasText}
  .link-accent{color:CanvasText;text-decoration:underline;text-decoration-thickness:2px}
}

@media (prefers-contrast: more){
  :root{--muted:color-mix(in srgb,var(--ink) 82%,transparent);--ink-2:color-mix(in srgb,var(--ink) 88%,transparent);--line:color-mix(in srgb,var(--ink) 62%,transparent);--line-soft:color-mix(in srgb,var(--ink) 48%,transparent)}
  :where(.page-hero .sub,.prose p,.prose li,.foot-bar){color:var(--ink)}
  :where(.nav-wrap,.notice,.prose .ph,.btn){border-color:currentColor}
  .link-accent{color:currentColor;text-decoration-thickness:3px;font-weight:700}
  :where(a,button):focus-visible{outline:2px solid #fff;outline-offset:2px;box-shadow:0 0 0 6px #0b3d91}
}