:root{
  --bg:#0c1220;
  --bg-elev:#121a2c;
  --text:#eef3ff;
  --muted:rgba(238,243,255,.68);
  --faint:rgba(238,243,255,.48);
  --line:rgba(255,255,255,.10);
  --accent:#8eb6ff;
  --accent-2:#b9a4ff;
  --ok:#5ee1c3;
  --radius:16px;
  --max:1080px;
  --shadow:0 20px 50px rgba(0,0,0,.28);
}
*{box-sizing:border-box}
html{overflow-x:hidden; scroll-behavior:smooth}
body{
  margin:0;
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,"Noto Sans TC",sans-serif;
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(142,182,255,.16), transparent 55%),
    radial-gradient(720px 380px at 100% 0%, rgba(185,164,255,.12), transparent 50%),
    var(--bg);
  -webkit-text-size-adjust:100%;
  line-height:1.55;
}
a{color:var(--accent); text-decoration:none}
a:hover{color:#c9dbff}
.container{max-width:var(--max); margin:0 auto; padding:0 22px}

.topbar{
  position:sticky; top:0; z-index:20;
  background:rgba(12,18,32,.78);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
.topbar__inner{display:flex; align-items:center; justify-content:space-between; min-height:64px; gap:16px}
.brand{display:flex; align-items:center; gap:10px; color:var(--text); font-weight:700}
.brand:hover{color:var(--text)}
.brand__dot{width:9px; height:9px; border-radius:99px; background:linear-gradient(135deg,var(--accent),var(--accent-2))}
.brand__mark{display:flex; flex-direction:column; line-height:1.15}
.brand__name{font-size:15px; letter-spacing:.01em}
.brand__sub{font-size:11px; color:var(--faint); font-weight:600}

.menu-toggle{
  display:none; background:transparent; border:1px solid var(--line); border-radius:10px;
  width:40px; height:40px; cursor:pointer;
}
.menu-toggle span{display:block; width:16px; height:1.5px; background:var(--text); margin:4px auto; border-radius:2px}
.nav{display:flex; align-items:center; gap:2px}
.nav a{
  color:var(--muted); font-size:13.5px; font-weight:600;
  padding:8px 10px; border-radius:999px; border:1px solid transparent;
}
.nav a:hover,.nav a.is-active{color:var(--text); background:rgba(255,255,255,.05); border-color:var(--line)}

.hero{padding:56px 0 12px}
.hero__grid{display:grid; grid-template-columns:1.35fr .75fr; gap:28px; align-items:start}
.kicker{
  color:var(--ok); font-size:12px; font-weight:700;
  letter-spacing:.14em; text-transform:uppercase; margin:0 0 12px;
}
h1{
  margin:0 0 14px;
  font-family:"Source Serif 4",Georgia,"Times New Roman",serif;
  font-size:clamp(32px,5vw,48px);
  line-height:1.12;
  font-weight:600;
  letter-spacing:-.02em;
}
h2{
  margin:0 0 8px;
  font-family:"Source Serif 4",Georgia,serif;
  font-size:28px; font-weight:600; letter-spacing:-.02em;
}
h3{margin:0 0 8px; font-size:17px; font-weight:700}
.lead{margin:0; color:var(--muted); font-size:17px; line-height:1.65; max-width:62ch}
.muted{color:var(--muted)}
.section-head{margin-bottom:18px}
.section-head p{margin:0; max-width:68ch}

.cta{display:flex; gap:10px; flex-wrap:wrap; margin-top:22px}
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:10px 16px; border-radius:999px; font-weight:700; font-size:14px;
  border:1px solid var(--line); color:var(--text); background:transparent;
}
.btn:hover{background:rgba(255,255,255,.06); color:var(--text)}
.btn--primary{background:var(--text); color:#0c1220; border-color:transparent}
.btn--primary:hover{background:#fff; color:#0c1220}

.side-card{
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:18px 18px 8px;
}
.side-card .kicker{margin-bottom:10px}
.side-card a{
  display:block; color:var(--text); font-weight:600; font-size:14px;
  padding:11px 0; border-top:1px solid var(--line);
}
.side-card a:first-of-type{border-top:0}
.side-card a:hover{color:var(--accent)}
.side-card small{display:block; color:var(--faint); font-weight:500; font-size:12px; margin-top:2px}

.stats{
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:0; margin:28px 0 8px;
  border:1px solid var(--line); border-radius:var(--radius); overflow:hidden;
  background:rgba(255,255,255,.03);
}
.stat{padding:16px 18px; border-left:1px solid var(--line)}
.stat:first-child{border-left:0}
.stat__n{font-size:26px; font-weight:750; letter-spacing:-.03em}
.stat__l{color:var(--faint); font-size:12px; margin-top:3px}

.section{padding:36px 0}
.section--end{padding-bottom:56px}

.cards{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
.cards--2{grid-template-columns:repeat(2,1fr)}
.card{
  background:rgba(255,255,255,.035);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px 20px 18px;
}
.card--jp{border-top:3px solid var(--ok)}
.card--bio{border-top:3px solid var(--accent)}
.card--oc{border-top:3px solid var(--accent-2)}
.tag{
  display:inline-block; font-size:11px; font-weight:700; letter-spacing:.08em;
  text-transform:uppercase; color:var(--faint); margin-bottom:10px;
}
.card p{margin:0 0 14px; color:var(--muted); font-size:14.5px}
.card h3{font-size:20px; font-family:"Source Serif 4",Georgia,serif; font-weight:600}
.links{display:flex; flex-wrap:wrap; gap:8px}
.link{
  color:var(--text); font-size:13px; font-weight:650;
  padding:6px 10px; border-radius:999px; border:1px solid var(--line);
}
.link:hover{background:rgba(255,255,255,.06); color:var(--text)}

.method{display:grid; grid-template-columns:repeat(3,1fr); gap:14px}
.step{
  display:flex; align-items:center; justify-content:center;
  width:28px; height:28px; border-radius:99px; margin-bottom:12px;
  background:rgba(142,182,255,.12); color:var(--accent);
  font-size:13px; font-weight:800;
}

.lesson-list{display:grid; gap:0; border:1px solid var(--line); border-radius:var(--radius); overflow:hidden}
.lesson-list a{
  display:grid; grid-template-columns:140px 1fr auto; gap:16px; align-items:center;
  padding:16px 18px; color:var(--text); border-top:1px solid var(--line);
  background:rgba(255,255,255,.03);
}
.lesson-list a:first-child{border-top:0}
.lesson-list a:hover{background:rgba(255,255,255,.06)}
.lesson-list .tag{margin:0}
.lesson-list p{margin:0; color:var(--muted); font-size:14px}
.lesson-list strong{display:block; margin-bottom:3px; font-size:15px}
.lesson-list .go{color:var(--faint); font-size:13px; font-weight:650}

.page-hero{padding:48px 0 8px}
.page-hero .lead{margin-top:8px}
.footer{
  border-top:1px solid var(--line);
  padding:28px 0 36px;
  color:var(--faint); font-size:13.5px;
}
.footer__grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:24px}
.footer h4{margin:0 0 10px; color:var(--muted); font-size:11px; letter-spacing:.12em; text-transform:uppercase}
.footer a{display:block; color:var(--text); font-weight:600; padding:3px 0}
.footer .brand-foot{color:var(--text); font-weight:750; font-size:15px; margin-bottom:6px}

@media (max-width: 980px){
  .hero__grid,.cards,.cards--2,.method,.stats,.footer__grid{grid-template-columns:1fr}
  .stat{border-left:0; border-top:1px solid var(--line)}
  .stat:first-child{border-top:0}
  .lesson-list a{grid-template-columns:1fr; gap:6px}
}
@media (max-width: 760px){
  .menu-toggle{display:block}
  .nav{
    display:none; position:absolute; top:100%; left:0; right:0;
    flex-direction:column; padding:10px 14px 14px;
    background:rgba(12,18,32,.96); border-bottom:1px solid var(--line);
  }
  .nav.nav--open{display:flex}
  .topbar__inner{position:relative}
  .hero{padding:36px 0 8px}
  .cta{flex-direction:column}
  .btn{width:100%}
}