:root{
  color-scheme:light dark;
  --bg:#F3F4F7;--surface:#FFFFFF;--ink:#111218;--muted:#5A5E6B;--line:#E3E5EB;
  --accent:#4338F2;--accent-ink:#FFFFFF;--accent-soft:#ECEBFF;--rec:#D93025;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0E0F14;--surface:#1A1C24;--ink:#F2F3F7;--muted:#A3A7B5;--line:#2A2D38;
    --accent:#8B85FF;--accent-ink:#0E0F14;--accent-soft:#25234A;--rec:#FF6B5E}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);
  font:17px/1.8 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif}
a{color:var(--accent);text-underline-offset:4px}
img{max-width:100%}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header.top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:20px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--ink);text-decoration:none}
.brand-mark{width:32px;height:32px;border-radius:9px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center}
nav.links{display:flex;gap:18px;flex-wrap:wrap;font-size:15px}
nav.links a{color:var(--muted);text-decoration:none}
nav.links a[aria-current]{color:var(--ink);font-weight:600}
h1{font-size:clamp(34px,7vw,56px);line-height:1.15;letter-spacing:-.5px;margin:40px 0 12px}
h2{font-size:24px;line-height:1.35;margin:44px 0 10px}
h3{font-size:18px;margin:24px 0 4px}
p,li{margin:8px 0}
.lead{font-size:20px;color:var(--muted);max-width:36em}
.muted{color:var(--muted);font-size:14px}
.card{background:var(--surface);border-radius:20px;padding:20px 22px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:28px 0}
.grid .card h3{margin-top:4px}
.icon{width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;margin-bottom:6px}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:var(--accent-ink);text-decoration:none;font-weight:600;border-radius:14px;padding:12px 22px;min-height:48px}
.hero{display:flex;flex-wrap:wrap;align-items:center;gap:32px;padding-bottom:12px}
.hero-text{flex:999 1 380px;min-width:0}
.orb{flex:1 1 200px;display:grid;place-items:center;min-height:220px}
.orb span{width:168px;height:168px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;
  box-shadow:0 0 0 14px color-mix(in srgb,var(--accent) 16%,transparent),0 0 0 28px color-mix(in srgb,var(--accent) 8%,transparent)}
ol.steps{list-style:none;padding:0;counter-reset:s;display:grid;gap:12px}
ol.steps li{counter-increment:s;background:var(--surface);border-radius:16px;padding:14px 18px 14px 62px;position:relative;margin:0}
ol.steps li::before{content:counter(s);position:absolute;left:18px;top:14px;width:30px;height:30px;border-radius:50%;
  background:var(--accent-soft);color:var(--accent);font-weight:700;display:grid;place-items:center;line-height:1}
.toc{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}
.toc a{background:var(--surface);border-radius:999px;padding:6px 14px;text-decoration:none;font-size:15px;color:var(--ink)}
table{width:100%;border-collapse:collapse;background:var(--surface);border-radius:16px;overflow:hidden;font-size:16px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:none}
th{font-size:14px;color:var(--muted);font-weight:600}
.table-box{overflow-x:auto;border-radius:16px}
kbd{font:inherit;font-size:.9em;background:var(--surface);border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:0 6px}
.callout{border-left:0;background:var(--accent-soft);border-radius:16px;padding:14px 18px}
footer{border-top:1px solid var(--line);margin-top:56px;padding:20px 0 40px;color:var(--muted);font-size:14px;display:flex;gap:18px;flex-wrap:wrap}
footer a{color:var(--muted)}
h2[id],h3[id]{scroll-margin-top:16px}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 6px}
.btn.ghost{background:var(--surface);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line)}
.example{display:grid;gap:10px;margin:18px 0}
.example .said,.example .got{background:var(--surface);border-radius:16px;padding:12px 16px}
.example .said{color:var(--muted)}
.example .tag{display:block;font-size:13px;font-weight:600;color:var(--muted);margin-bottom:2px}
.example .got .tag{color:var(--accent)}
ul.tight li{margin:4px 0}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  h1{margin-top:28px}
  h2{font-size:22px;margin-top:36px}
  .lead{font-size:18px}
  .orb{min-height:150px}
  .orb span{width:120px;height:120px}
  .orb svg{width:44px;height:44px}
  ol.steps li{padding:12px 14px 12px 54px}
  ol.steps li::before{left:14px;top:12px}
  th,td{padding:10px 12px}
  table.stack thead{display:none}
  table.stack,table.stack tbody,table.stack tr,table.stack td{display:block;width:100%}
  table.stack tr{border-bottom:1px solid var(--line);padding:4px 0 8px}
  table.stack tr:last-child{border-bottom:none}
  table.stack td{border-bottom:none;padding:4px 14px}
  table.stack td:first-child{padding-top:12px;font-weight:600}
  table.stack td[data-label]::before{content:attr(data-label);display:block;font-size:13px;font-weight:600;color:var(--muted)}
}