:root{
  --bg:#fbf8f3; --bg2:#f3ede4; --card:#ffffff; --text:#221c17; --muted:#6d6259;
  --line:rgba(60,40,20,.12); --accent:#c2571a; --accent-soft:rgba(194,87,26,.1);
  --shadow:0 1px 2px rgba(60,40,20,.05),0 8px 24px rgba(60,40,20,.06);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI","PingFang SC","PingFang TC","Hiragino Sans","Noto Sans","Noto Sans SC","Noto Sans Arabic","Noto Sans Thai",Roboto,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#14110f; --bg2:#1c1815; --card:#1e1a17; --text:#f0e9e1; --muted:#a89d92;
    --line:rgba(255,235,215,.12); --accent:#ff9a5c; --accent-soft:rgba(255,154,92,.14);
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35); color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#14110f; --bg2:#1c1815; --card:#1e1a17; --text:#f0e9e1; --muted:#a89d92;
  --line:rgba(255,235,215,.12); --accent:#ff9a5c; --accent-soft:rgba(255,154,92,.14);
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35); color-scheme:dark;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
html{scroll-behavior:smooth;scroll-padding-top:84px}
@media (max-width:820px){html{scroll-padding-top:130px}}
body{margin:0;overflow-x:hidden;background:var(--bg);color:var(--text);font:16px/1.75 var(--font);-webkit-font-smoothing:antialiased;transition:background .25s,color .25s}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

.bar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:12px max(16px,env(safe-area-inset-right)) 12px max(16px,env(safe-area-inset-left));
  background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:saturate(1.6) blur(16px);-webkit-backdrop-filter:saturate(1.6) blur(16px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;font-weight:700;font-size:18px}
.logo{width:32px;height:32px;border-radius:8px;background:url(icon.png) center/cover;box-shadow:0 0 0 1px var(--line)}
.tools{display:flex;align-items:center;gap:8px}
.select{position:relative;display:flex;align-items:center}
.select svg{position:absolute;inset-inline-start:10px;width:18px;height:18px;pointer-events:none;color:var(--muted)}
svg{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
select{appearance:none;-webkit-appearance:none;font:inherit;font-size:14px;color:var(--text);background:var(--card);border:1px solid var(--line);
  border-radius:999px;padding:0 14px;padding-inline-start:34px;height:40px;cursor:pointer;max-width:190px}
.icon-btn{width:40px;height:40px;display:grid;place-items:center;border-radius:50%;border:1px solid var(--line);background:var(--card);color:var(--text);cursor:pointer}
.icon-btn svg{width:18px;height:18px;grid-area:1/1;display:none}
:root:not([data-theme]) .i-auto,:root[data-theme="light"] .i-light,:root[data-theme="dark"] .i-dark{display:block}
select:focus-visible,.icon-btn:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

main{max-width:1040px;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left))}
.hero{padding:56px 0 32px;text-align:center}
.hero h1{margin:0;font-size:clamp(25px,7vw,48px);line-height:1.25;padding-bottom:.08em;overflow-wrap:anywhere;hyphens:auto;letter-spacing:-.02em;
  background:linear-gradient(120deg,var(--text),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.meta{margin:14px auto 0;max-width:600px;color:var(--muted);font-size:14px}

.layout{display:grid;grid-template-columns:220px 1fr;gap:32px;align-items:start;padding-bottom:64px}
.layout>*{min-width:0}
.toc{position:sticky;top:84px;display:flex;flex-direction:column;gap:2px;font-size:14px}
.toc a{color:var(--muted);text-decoration:none;padding:7px 12px;border-radius:10px;border-inline-start:2px solid transparent;transition:.15s}
.toc a:hover{color:var(--text);background:var(--bg2)}
.toc a.on{color:var(--accent);background:var(--accent-soft);border-inline-start-color:var(--accent);font-weight:600}
.cards{display:flex;flex-direction:column;gap:16px;min-width:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:24px 26px;box-shadow:var(--shadow)}
.card h2{margin:0 0 12px;font-size:20px;line-height:1.35;display:flex;align-items:center;gap:10px}
.card h2::before{content:"";width:6px;height:20px;border-radius:3px;background:var(--accent);flex:none}
.card p{margin:0 0 12px;overflow-wrap:anywhere}
.card p:last-child{margin-bottom:0}
.card.lead p{color:var(--muted)}
.card ul{margin:0 0 12px;padding-inline-start:0;list-style:none;display:flex;flex-direction:column;gap:8px}
.card li{position:relative;padding-inline-start:20px;overflow-wrap:anywhere}
.card li::before{content:"";position:absolute;inset-inline-start:2px;top:.8em;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.card a.mail{display:inline-flex;align-items:center;gap:8px;margin-top:4px;padding:10px 18px;border-radius:999px;background:var(--accent);color:#fff;text-decoration:none;font-weight:600}
:root[data-theme="dark"] .card a.mail{color:#1a120c}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .card a.mail{color:#1a120c}}
footer{text-align:center;color:var(--muted);font-size:13px;padding:24px 16px 40px;border-top:1px solid var(--line)}

@media (max-width:820px){
  .layout{grid-template-columns:1fr;gap:14px;padding-bottom:40px}
  .toc{position:sticky;top:65px;z-index:5;flex-direction:row;overflow-x:auto;gap:8px;padding:10px 16px;margin:0 -16px;
    background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    scrollbar-width:none;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain;touch-action:pan-x pan-y}
  .toc::-webkit-scrollbar{display:none}
  .toc a{white-space:nowrap;flex:none;border:1px solid var(--line);border-radius:999px;padding:7px 14px;background:var(--card)}
  .toc a.on{border-color:var(--accent)}
  .hero{padding:32px 0 18px}
  .card{padding:20px 18px;border-radius:18px}
  .card h2{font-size:18px}
  body{font-size:15.5px;line-height:1.7}
}
@media (max-width:480px){
  .brand-name{display:none}
  select{max-width:150px}
  footer{padding-bottom:max(40px,env(safe-area-inset-bottom))}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.bar,.toc{display:none}.card{box-shadow:none;break-inside:avoid}}