:root{--navy:#0a2a5e;--blue:#1a56b8;--sky:#e8f1fb;--gold:#f0b429;--ink:#1d2433;--muted:#5b6578;--line:#d9e2ef;--card:#fff}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Microsoft JhengHei","PingFang TC","Noto Sans TC",sans-serif;color:var(--ink);background:#f6f9fd;line-height:1.85;font-size:18px}
img{max-width:100%;height:auto}
a{color:var(--blue)}
.wrap{max-width:1080px;margin:0 auto;padding:0 18px}

/* header */
.top{background:#fff;position:sticky;top:0;z-index:20;box-shadow:0 2px 8px rgba(10,42,94,.18);border-bottom:3px solid var(--navy)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy)}
.brand img{height:50px}
.brand span{font-weight:700;font-size:20px;line-height:1.2}
.brand small{display:block;font-weight:400;font-size:13px;color:var(--muted)}
nav{display:flex;flex-wrap:wrap;gap:2px}
nav a{color:var(--navy);text-decoration:none;padding:8px 12px;border-radius:6px;font-size:16px}
nav a:hover{background:var(--sky)}
nav a.on{background:var(--gold);color:#1a1a1a;font-weight:700}
.nvt{display:none}
.nvb{display:none;color:var(--navy);font-size:28px;cursor:pointer;padding:4px 10px}
@media(max-width:900px){
 .nvb{display:block}
 nav{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;border-bottom:3px solid var(--navy);flex-direction:column;padding:8px 18px 14px}
 .nvt:checked~nav{display:flex}
 nav a{padding:12px 8px;font-size:18px}
 .bar{position:relative}
}

/* hero */
.hero{background:linear-gradient(135deg,#0a2a5e 0%,#1a56b8 100%);color:#fff;padding:54px 0 46px}
.hero h1{margin:0 0 10px;font-size:38px;line-height:1.35}
.hero p{margin:0;font-size:20px;color:#dbe7fb;max-width:760px}
.hero .gold{color:var(--gold)}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.btn{display:inline-block;background:var(--gold);color:#1a1a1a;text-decoration:none;font-weight:700;padding:11px 22px;border-radius:8px;font-size:17px}
.btn:hover{filter:brightness(1.08)}
.btn.ghost{background:transparent;color:#fff;border:2px solid #9fb8e3}
.btn.dark{background:var(--navy);color:#fff}

/* sections */
section{padding:42px 0}
section.alt{background:#fff}
h2{font-size:30px;margin:0 0 6px;color:var(--navy)}
h2+.sub{margin:0 0 22px;color:var(--muted)}
h3{font-size:22px;color:var(--blue);margin:26px 0 8px}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g5{grid-template-columns:repeat(5,1fr)}
@media(max-width:900px){.g3,.g5{grid-template-columns:repeat(2,1fr)}.g2{grid-template-columns:1fr}.hero h1{font-size:30px}}
@media(max-width:560px){.g3,.g5{grid-template-columns:1fr}body{font-size:17px}}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;box-shadow:0 2px 8px rgba(10,42,94,.06)}
.card h3{margin-top:0}
.sys{display:block;text-decoration:none;color:var(--ink);transition:transform .15s,box-shadow .15s}
.sys:hover{transform:translateY(-3px);box-shadow:0 8px 18px rgba(10,42,94,.15)}
.sys .tag{display:inline-block;color:#fff;font-weight:700;border-radius:20px;padding:3px 14px;font-size:15px;margin-bottom:8px}
.t1{background:#2563eb}.t2{background:#e56a0c}.t3{background:#16994a}.t4{background:#7c3aed}.t5{background:#0f8a8a}
.sys p{margin:6px 0 0;color:var(--muted);font-size:16px;line-height:1.7}
.ok{list-style:none;padding:0;margin:0}
.ok li{padding:6px 0 6px 30px;position:relative}
.ok li:before{content:"✔";position:absolute;left:0;color:#16994a;font-weight:700}
.shot{margin:14px 0;border:1px solid var(--line);border-radius:10px;box-shadow:0 4px 14px rgba(10,42,94,.12);background:#fff}
.cap{font-size:15px;color:var(--muted);margin:-6px 0 16px}
.note{background:var(--sky);border-left:5px solid var(--blue);padding:14px 18px;border-radius:6px;margin:16px 0}
.try{background:#fff8e1;border:1px solid #f1d98a;border-radius:10px;padding:16px 20px;margin:18px 0}
.try code{background:#fff;padding:1px 8px;border-radius:4px;border:1px solid #e6d9a8}

/* sub navigation on long page */
.subnav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:64px;z-index:10}
.subnav .wrap{display:flex;flex-wrap:wrap;gap:4px;padding-top:8px;padding-bottom:8px}
.subnav a{text-decoration:none;color:var(--navy);background:var(--sky);padding:5px 12px;border-radius:16px;font-size:15px}
.subnav a:hover{background:var(--gold)}
@media(max-width:900px){.subnav{position:static}}
.qa dt{font-weight:700;color:var(--navy);margin-top:18px}
.qa dd{margin:4px 0 0 0;padding-left:0}
.videos video{width:100%;max-width:760px;border-radius:10px;background:#000;display:block;margin:8px 0 22px}

/* footer */
footer{background:#08204a;color:#c9d8f0;padding:36px 0 20px;margin-top:20px}
footer h4{color:#fff;margin:0 0 8px;font-size:18px}
footer p{margin:0 0 10px;font-size:16px;line-height:1.8}
footer a{color:#ffd77a}
.fgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media(max-width:800px){.fgrid{grid-template-columns:1fr}}
.copy{border-top:1px solid rgba(255,255,255,.15);padding-top:14px;margin-top:14px;font-size:14px;color:#8fa6cc;text-align:center}
.vlist{display:grid;gap:10px;max-width:860px}
.vlink{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;text-decoration:none;color:var(--navy);font-weight:700;box-shadow:0 2px 8px rgba(10,42,94,.06)}
.vlink:hover{border-color:var(--blue);box-shadow:0 6px 16px rgba(10,42,94,.14)}
.vlink .play{flex:none;width:38px;height:38px;border-radius:50%;background:var(--gold);color:#1a1a1a;display:flex;align-items:center;justify-content:center;font-size:16px}
.qr{display:block;width:170px;max-width:100%;height:auto;background:#fff;border-radius:8px;margin:4px 0 8px}
.qrid{margin:0;font-size:15px}
.qrid b{color:inherit}
footer .qrid b{color:#ffd77a}