:root{--bg:#fff;--fg:#0a0a0a;--muted:#6b6b6b;--line:#e6e6e6;--soft:#f5f5f5;--accent:#0a0a0a;--accent-fg:#fff;--ok:#1f8a4c;--maxw:1040px;--r:14px}
@media (prefers-color-scheme:dark){:root{--bg:#0f0f0f;--fg:#f2f2f2;--muted:#9a9a9a;--line:#262626;--soft:#181818;--accent:#f2f2f2;--accent-fg:#0f0f0f}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Noto Sans TC","Microsoft JhengHei",sans-serif;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit}
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:20px}
header{position:sticky;top:0;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:60px;gap:12px}
.logo{font-weight:800;letter-spacing:-.02em;text-decoration:none;font-size:18px;display:flex;align-items:center;gap:8px}
.logo span{font-weight:500;color:var(--muted);font-size:13px}
.nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0;align-items:center}
.nav ul a{text-decoration:none;padding:8px 12px;border-radius:999px;font-size:14px;color:var(--muted)}
.nav ul a:hover{background:var(--soft);color:var(--fg)}
.nav ul a.btn{color:var(--accent-fg)}
@media (max-width:640px){.nav ul a:not(.btn){display:none}}
.btn{display:inline-block;background:var(--accent);color:var(--accent-fg);padding:12px 22px;border-radius:999px;text-decoration:none;font-weight:700;font-size:15px;border:1px solid var(--accent);cursor:pointer;line-height:1.3}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--fg)}
.btn.big{padding:15px 28px;font-size:16px}
.hero{padding-block:72px 48px;text-align:left}
.eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700}
h1{font-size:clamp(30px,5.4vw,52px);line-height:1.18;letter-spacing:-.02em;margin:14px 0 18px;font-weight:800}
.lead{font-size:18px;color:var(--muted);max-width:640px;margin:0 0 28px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.pills{display:flex;gap:18px;flex-wrap:wrap;margin-top:22px;padding:0;list-style:none;color:var(--muted);font-size:14px}
.pills li::before{content:"✓ ";color:var(--ok);font-weight:800}
section{padding-block:56px;border-top:1px solid var(--line)}
h2{font-size:clamp(24px,3.4vw,34px);letter-spacing:-.02em;line-height:1.25;margin:6px 0 10px;font-weight:800}
.sub{color:var(--muted);max-width:640px;margin:0 0 30px}
.grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--soft);border:1px solid var(--line);border-radius:var(--r);padding:22px}
.card .n{font-size:12px;font-weight:800;color:var(--muted);letter-spacing:.1em}
.card h3{margin:8px 0 6px;font-size:18px}
.card p{margin:0;color:var(--muted);font-size:15px}
.stats{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:36px}
.stat{border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.stat b{display:block;font-size:30px;letter-spacing:-.02em;line-height:1.1}
.stat small{color:var(--muted)}
.steps{counter-reset:s;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.step{position:relative;padding:22px 22px 22px 22px;border:1px solid var(--line);border-radius:var(--r)}
.step::before{counter-increment:s;content:counter(s);display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--accent-fg);font-weight:800;font-size:14px;margin-bottom:10px}
.step h3{margin:0 0 6px;font-size:17px}
.step p{margin:0;color:var(--muted);font-size:15px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.tags li{border:1px solid var(--line);border-radius:999px;padding:7px 14px;font-size:14px;background:var(--bg)}
.tags.soft li{background:var(--soft);border-color:transparent;color:var(--muted)}
.compare{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.compare .card:not(.good){background:transparent;border-style:dashed;color:var(--muted)}.compare .card:not(.good) h3{color:var(--muted)}.compare .card:not(.good) h3::before{content:"✕ ";color:#c0392b}.compare .card.good{border:2px solid var(--ok);background:color-mix(in srgb,var(--ok) 9%,var(--bg))}.compare .card.good h3{color:var(--ok)}.compare .card.good h3::before{content:"✓ "}.compare .card.good p{color:var(--fg)}
details{border-top:1px solid var(--line);padding:14px 0}
details:last-of-type{border-bottom:1px solid var(--line)}
summary{cursor:pointer;font-weight:700;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
summary::after{content:"+";color:var(--muted);font-weight:400;font-size:20px}
details[open] summary::after{content:"–"}
details p{margin:10px 0 0;color:var(--muted)}
.final{text-align:center;padding-block:72px}
.final h2{margin-bottom:10px}
footer{border-top:1px solid var(--line);padding-block:36px;color:var(--muted);font-size:13px}
footer .cols{display:grid;gap:20px;grid-template-columns:2fr 1fr 1fr}
@media (max-width:640px){footer .cols{grid-template-columns:1fr}}
footer ul{list-style:none;padding:0;margin:8px 0 0}
footer li{margin:4px 0}
footer a{text-decoration:none}
footer a:hover{text-decoration:underline}
.fine{margin-top:24px;font-size:12px;opacity:.8}
/* forms */
.form{max-width:680px;margin:0 auto}
.form h1{font-size:clamp(26px,4vw,38px)}
fieldset{border:1px solid var(--line);border-radius:var(--r);padding:22px;margin:0 0 20px}
legend{font-weight:800;padding:0 8px;font-size:15px}
label{display:block;font-weight:700;font-size:14px;margin:14px 0 6px}
label .opt{color:var(--muted);font-weight:500}
.hint{display:block;color:var(--muted);font-size:13px;font-weight:400;margin-top:4px}
input[type=text],input[type=url],input[type=email],input[type=number],select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--fg);font:inherit;font-size:16px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
textarea{min-height:110px;resize:vertical}
.row{display:grid;gap:14px;grid-template-columns:1fr 1fr}
@media (max-width:560px){.row{grid-template-columns:1fr}}
.checks{display:grid;gap:8px 14px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin-top:6px}
.checks label{display:flex;gap:8px;align-items:center;font-weight:500;margin:0;font-size:15px}
.checks input{width:18px;height:18px;accent-color:var(--accent)}
.agree{display:flex;gap:10px;align-items:flex-start;font-weight:500;font-size:14px;color:var(--muted);margin:6px 0 18px}
.agree input{margin-top:5px;width:18px;height:18px;accent-color:var(--accent)}
.hidden{position:absolute;left:-9999px}
.note{background:var(--soft);border-radius:var(--r);padding:16px 18px;font-size:14px;color:var(--muted);margin:0 0 24px}
.platform-links{display:grid;gap:12px;margin-top:14px}.platform-links:empty{display:none}#platformHint{margin-top:12px}[hidden]{display:none!important}