: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}
  html{scroll-behavior:smooth}
  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-links a.on{color:var(--ink);font-weight:500}
  .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}
  .btn-accent{padding:14px 28px;background:var(--accent);color:#fff;font-size:15.5px}
  .btn-accent:hover{background:var(--accent-deep);transform:translateY(-1px);box-shadow:0 6px 18px rgba(217,119,87,.28)}
  .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:72px 0 30px;text-align:center}
  .page-hero h1{font-family:var(--serif);font-size:clamp(30px,4.4vw,44px);font-weight:600;letter-spacing:.08em;margin-bottom:14px}
  .page-hero .sub{font-size:15.5px;color:var(--ink-2);max-width:560px;margin:0 auto;text-wrap:balance}
  .page-body{max-width:840px;margin:0 auto;padding:0 28px 20px}
  h2.sec{font-family:var(--serif);font-size:22px;font-weight:600;letter-spacing:.05em;margin:46px 0 12px}
  .lead{font-size:14.5px;color:var(--ink-2)}
  .lead a{color:var(--accent-deep);text-decoration:underline;text-underline-offset:3px}
  .lead b{color:var(--ink)}

  .steps{counter-reset:s;list-style:none;margin:18px 0 6px}
  .steps li{position:relative;padding:0 0 18px 44px;font-size:14.5px;color:var(--ink-2)}
  .steps li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:2px;width:28px;height:28px;border-radius:50%;background:var(--accent-soft);color:var(--accent-deep);font-size:13.5px;display:flex;align-items:center;justify-content:center;font-weight:600}
  .steps li b{color:var(--ink);font-weight:600}

  .guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}
  .gcard{background:var(--bg-soft);border:1px solid var(--line-soft);border-radius:16px;padding:18px 20px}
  .gcard b{display:block;font-size:14.5px;margin-bottom:4px}
  .gcard span{font-size:13px;color:var(--ink-2)}

  .faq{margin-top:6px}
  .faq details{border-bottom:1px solid var(--line-soft);padding:16px 4px}
  .faq summary{cursor:pointer;font-size:15px;font-weight:500;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";color:var(--muted);font-size:18px;flex:none}
  .faq details[open] summary::after{content:"−"}
  .faq details p{font-size:14px;color:var(--ink-2);margin-top:10px}

  .contact-card{background:var(--card);border:1px solid var(--line-soft);border-radius:20px;padding:28px 30px;margin-top:16px}
  .contact-card p{font-size:14.5px;color:var(--ink-2);margin-bottom:8px}
  .contact-card b{color:var(--ink)}
  .contact-card .ph{background:var(--accent-soft);border-radius:4px;padding:0 4px}

  .cta-band{text-align:center;margin-top:72px}
  .cta-band p{font-family:var(--serif);font-size:21px;letter-spacing:.06em;margin-bottom:20px}

  footer{border-top:1px solid var(--line-soft);margin-top:88px;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}
    .guide-grid{grid-template-columns:repeat(2,1fr)}
  }
  @media (max-width:620px){
    .container,.page-body{padding-left:20px;padding-right:20px}
    .guide-grid{grid-template-columns:1fr}
    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:52px 0 24px}
    .page-hero h1{font-size:clamp(30px,9vw,38px);letter-spacing:.03em;overflow-wrap:anywhere}
    .page-hero .sub,.lead,.gcard,.contact-card{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}
  }


.lead-spacious{margin-top:14px}
.link-accent{color:var(--accent-deep);text-decoration:underline;text-underline-offset:3px}

@media (forced-colors: active){
  body,.nav-wrap,.page-body,.gcard,.contact-card,.faq details{background:Canvas;color:CanvasText;border-color:CanvasText}
  :where(button,.btn){background:ButtonFace;color:ButtonText;border-color:ButtonText}
  .nav-links a.on{background:Highlight;color:HighlightText;border:2px solid HighlightText}
  :where(.page-hero .sub,.lead,.gcard span,.contact-card p,.faq details p){color:CanvasText}
  :where(a,button,summary):focus-visible{outline:2px solid Highlight!important;outline-offset:2px;box-shadow:none!important}
  .contact-card .ph{border:1px solid CanvasText}
}

@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,.lead,.gcard span,.contact-card p,.faq details p){color:var(--ink)}
  :where(.nav-wrap,.gcard,.contact-card,.faq details,.btn){border-color:currentColor}
  .nav-links a.on{border:2px solid currentColor;font-weight:700}
  :where(a,button,summary):focus-visible{outline:2px solid #fff;outline-offset:2px;box-shadow:0 0 0 6px #0b3d91}
}