:root{
  --bg:#f7f8fa; --surface:#ffffff; --surface-2:#eef1f5; --ink:#141820; --ink-2:#465061; --muted:#7a8494;
  --line:#e1e5eb; --accent:#2563eb; --accent-ink:#ffffff; --accent-soft:#e6eefc;
  --up:#089981; --down:#e5484d; --warn-bg:#fff5e1; --warn-ink:#7a4a00; --warn-line:#f1c879;
  --radius:14px; --shadow:0 1px 2px rgba(16,24,40,.04),0 4px 16px rgba(16,24,40,.04);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1116; --surface:#161a21; --surface-2:#1e232c; --ink:#e9edf3; --ink-2:#b4bcc8; --muted:#848e9c;
    --line:#29303b; --accent:#6d9cff; --accent-ink:#0b1020; --accent-soft:#1a2540;
    --up:#2bbd9b; --down:#ff6b6f; --warn-bg:#2b2213; --warn-ink:#f2cd86; --warn-line:#5e4a20;
    --shadow:none;
  }
}
:root[data-theme="dark"]{
  --bg:#0e1116; --surface:#161a21; --surface-2:#1e232c; --ink:#e9edf3; --ink-2:#b4bcc8; --muted:#848e9c;
  --line:#29303b; --accent:#6d9cff; --accent-ink:#0b1020; --accent-soft:#1a2540;
  --up:#2bbd9b; --down:#ff6b6f; --warn-bg:#2b2213; --warn-ink:#f2cd86; --warn-line:#5e4a20;
  --shadow:none;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 -apple-system,"Segoe UI","Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.3;letter-spacing:-.01em}
code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.9em;background:var(--surface-2);padding:1px 6px;border-radius:5px}

.container{max-width:1080px;margin:0 auto;padding:0 16px}
.narrow{max-width:760px}

/* header */
.site-header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:12px;height:60px}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--ink);font-size:17px}
.brand:hover{text-decoration:none}
.brand-mark{width:26px;height:26px;border-radius:7px;background:var(--accent);display:grid;place-items:center}
.brand-mark svg{width:16px;height:16px}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:var(--ink-2);font-size:15px;padding:6px 10px;border-radius:8px}
.nav a:hover,.nav a[aria-current="page"]{background:var(--surface-2);color:var(--ink);text-decoration:none}
.nav .btn{margin-left:6px}
.nav a.btn,.nav a.btn:hover{color:var(--accent-ink);background:var(--accent)}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:6px 10px;color:var(--ink);font:inherit;font-size:14px;cursor:pointer}
@media (max-width:760px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:8px 16px 14px}
  .nav.open{display:flex}
  .nav a{padding:10px 8px}
  .nav .btn{margin:6px 0 0;text-align:center}
}

/* buttons */
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:600;font-size:15px;padding:10px 18px;border-radius:10px;border:1px solid var(--accent);cursor:pointer;font-family:inherit;line-height:1.4}
.btn:hover{text-decoration:none;filter:brightness(1.07)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:var(--surface-2)}
.btn.sm{padding:6px 12px;font-size:14px}

/* sections */
section{padding:56px 0}
section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--accent);text-transform:uppercase;margin:0 0 6px}
.section-title{font-size:28px;margin:0 0 8px}
.section-lede{color:var(--ink-2);margin:0 0 28px;max-width:680px}

/* hero */
.hero{padding:72px 0 56px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero h1{font-size:42px;margin:0 0 16px}
.hero p.lede{font-size:18px;color:var(--ink-2);margin:0 0 24px}
.hero .actions{display:flex;gap:10px;flex-wrap:wrap}
.hero .note{font-size:13px;color:var(--muted);margin-top:14px}
@media (max-width:860px){ .hero-grid{grid-template-columns:1fr} .hero h1{font-size:32px} .hero{padding:48px 0 32px} }

/* cards & grids */
.grid{display:grid;gap:16px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
@media (max-width:860px){ .grid.c3,.grid.c2{grid-template-columns:1fr} }
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card h3{margin:0 0 8px;font-size:18px}
.card p{margin:0;color:var(--ink-2)}
.card .icon{width:36px;height:36px;border-radius:10px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;margin-bottom:12px}
.card .icon svg{width:20px;height:20px}
.tag{display:inline-block;font-size:12px;font-weight:600;padding:2px 9px;border-radius:999px;background:var(--accent-soft);color:var(--accent)}
.tag.up{background:color-mix(in srgb,var(--up) 15%,transparent);color:var(--up)}

.figure{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow)}
.figure figcaption{font-size:13px;color:var(--muted);padding:8px 4px 0}

/* feature list */
ul.check{list-style:none;padding:0;margin:0}
ul.check li{position:relative;padding:4px 0 4px 28px;color:var(--ink-2)}
ul.check li::before{content:"";position:absolute;left:2px;top:12px;width:14px;height:8px;border-left:2.5px solid var(--up);border-bottom:2.5px solid var(--up);transform:rotate(-45deg)}

/* steps */
ol.steps{list-style:none;padding:0;margin:0;counter-reset:s;display:grid;gap:14px}
ol.steps li{counter-increment:s;position:relative;padding:16px 18px 16px 62px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
ol.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:700;font-size:14px}
ol.steps b{display:block;margin-bottom:2px}
ol.steps span{color:var(--ink-2)}

/* pricing */
.price-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
@media (max-width:960px){ .price-grid{grid-template-columns:repeat(2,1fr)} }
@media (max-width:560px){ .price-grid{grid-template-columns:1fr} }
.price{display:flex;flex-direction:column;gap:6px}
.price .amount{font-size:26px;font-weight:700;font-variant-numeric:tabular-nums}
.price .amount small{font-size:14px;color:var(--muted);font-weight:500}
.price .meta{font-size:13px;color:var(--muted)}
.price.featured{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;font-size:15px;min-width:520px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--surface-2);color:var(--ink-2);font-size:13px;font-weight:600}
tr:last-child td{border-bottom:0}

/* FAQ */
details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 18px;margin-bottom:10px}
details summary{cursor:pointer;font-weight:600;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--muted);font-weight:400;font-size:20px;line-height:1}
details[open] summary::after{content:"–"}
details p{margin:0 0 14px;color:var(--ink-2)}

/* forms */
form.form{display:grid;gap:14px}
.form .row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:640px){ .form .row{grid-template-columns:1fr} }
.form label{display:block;font-size:14px;font-weight:600;color:var(--ink-2)}
.form label > input,.form label > select,.form label > textarea{display:block;margin-top:6px}
.form label > .hint{display:block;margin-top:2px}
.form label .opt{font-weight:400;color:var(--muted)}
.form input,.form select,.form textarea{font:inherit;font-size:15px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px;width:100%}
.form textarea{min-height:120px;resize:vertical}
.form input:focus,.form select:focus,.form textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.form .hint{font-size:13px;color:var(--muted);font-weight:400}
.form-status{font-size:14px;margin:0;min-height:1.4em}
.form-status.ok{color:var(--up)} .form-status.err{color:var(--down)}
.inline-form{display:flex;gap:10px;flex-wrap:wrap}
.inline-form input{flex:1 1 220px}

/* callouts */
.callout{background:var(--warn-bg);border:1px solid var(--warn-line);color:var(--warn-ink);border-radius:12px;padding:14px 18px;font-size:15px}
.callout.info{background:var(--accent-soft);border-color:var(--line);color:var(--ink)}

/* article */
.article{padding:48px 0 24px}
.article h1{font-size:34px;margin:0 0 10px}
.article .byline{color:var(--muted);font-size:14px;margin-bottom:28px}
.article h2{font-size:24px;margin:40px 0 12px}
.article h3{font-size:19px;margin:28px 0 8px}
.article p,.article li{color:var(--ink-2)}
.article ul,.article ol{padding-left:22px}
.article li{margin:4px 0}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:0 0 24px}
.toc b{display:block;margin-bottom:4px}
.toc ol{margin:0;padding-left:20px}

/* CTA band */
.cta{background:var(--accent);color:var(--accent-ink);border-radius:18px;padding:32px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.cta h2{margin:0 0 4px;font-size:24px}
.cta p{margin:0;opacity:.9}
.cta .btn{background:var(--accent-ink);color:var(--accent);border-color:var(--accent-ink)}
.article .cta h2{margin:0 0 4px;font-size:22px}
.article .cta p{color:var(--accent-ink)}

/* footer */
.site-footer{border-top:1px solid var(--line);padding:36px 0 44px;color:var(--muted);font-size:14px;margin-top:24px}
.site-footer .cols{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:18px}
.site-footer .tagline{font-weight:400;color:var(--muted)}
.site-footer nav{display:flex;gap:16px;flex-wrap:wrap}
.site-footer nav a{color:var(--ink-2)}
.site-footer p{margin:6px 0;max-width:820px}
.is-hidden{display:none !important}

.form-consent{font-size:13px;color:var(--muted);margin:0}