:root{
  --ink:#0a1830;          /* 深藍主色 */
  --ink-2:#0f2a4d;
  --blue:#0ea5e9;         /* 電路藍 */
  --blue-d:#0284c7;
  --cyan:#22d3ee;
  --line:#e2e8f0;
  --muted:#64748b;
  --bg-soft:#f7f9fc;
  --radius:14px;
  --shadow:0 10px 30px rgba(10,24,48,.08);
  --container:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Noto Sans TC","Sora",system-ui,sans-serif;
  color:var(--ink);background:#fff;line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:1000;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand img{display:block}
.main-nav{display:flex;gap:6px;margin-left:auto}
.main-nav a{
  padding:8px 16px;border-radius:10px;font-weight:500;color:#1e293b;
  transition:.2s;position:relative;
}
.main-nav a:hover{color:var(--blue-d);background:var(--bg-soft)}
.lang-switch{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:3px;margin-left:8px}
.lang-switch a{padding:4px 11px;border-radius:999px;font-size:.8rem;font-weight:600;color:var(--muted)}
.lang-switch a.active{background:var(--ink);color:#fff}
.nav-toggle{display:none;background:none;border:0;font-size:1.6rem;color:var(--ink);margin-left:auto}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:520px;display:flex;align-items:center;overflow:hidden;background:var(--ink)}
.hero-bg{
  position:absolute;inset:0;
  background:
    radial-gradient(900px 500px at 70% 30%,rgba(34,211,238,.22),transparent 60%),
    radial-gradient(700px 600px at 20% 80%,rgba(14,165,233,.25),transparent 60%),
    linear-gradient(135deg,#08152b,#0f2a4d);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;opacity:.18;
  background-image:linear-gradient(rgba(255,255,255,.5) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.5) 1px,transparent 1px);
  background-size:48px 48px;mask-image:radial-gradient(circle at 60% 40%,#000,transparent 75%);
}
.hero-content{position:relative;color:#fff}
.hero-title{font-family:"Sora",sans-serif;font-weight:800;font-size:clamp(2rem,5vw,3.4rem);letter-spacing:.02em;margin:0 0 .5rem}
.hero-subtitle{font-size:clamp(1rem,2vw,1.3rem);color:#cbd5e1;margin:0 0 1.8rem}
.btn-hero{
  display:inline-flex;align-items:center;gap:8px;background:var(--blue);color:#fff;
  padding:13px 26px;border-radius:999px;font-weight:600;transition:.25s;
}
.btn-hero:hover{background:var(--cyan);color:var(--ink);transform:translateY(-2px)}

/* ---------- Sections ---------- */
.section{padding:72px 0}
.section:nth-child(even){background:var(--bg-soft)}
.section-title{font-family:"Sora",sans-serif;font-weight:700;font-size:clamp(1.5rem,3vw,2.1rem);margin:0 0 1.2rem;position:relative;padding-bottom:.6rem}
.section-title::after{content:"";position:absolute;left:0;bottom:0;width:54px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.lead-text{max-width:760px;color:#334155;margin:0 0 1.5rem}
.btn-outline{display:inline-flex;align-items:center;gap:8px;border:1.5px solid var(--ink);padding:10px 22px;border-radius:999px;font-weight:600;transition:.2s}
.btn-outline:hover{background:var(--ink);color:#fff}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#cbd5e1;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1.6fr 1fr;gap:32px;padding:56px 20px 36px}
.footer-slogan{font-weight:600;color:#fff;font-size:1.05rem}
.footer-contact p{margin:.35rem 0;font-size:.92rem}
.footer-contact i{color:var(--blue)}
.footer-social span{display:block;font-weight:600;color:#fff;margin-bottom:10px}
.social-icons{display:flex;gap:10px}
.social-icons a{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.08);display:grid;place-items:center;transition:.2s}
.social-icons a:hover{background:var(--blue);color:#fff}
.footer-copy{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;font-size:.82rem;color:#94a3b8}

/* ---------- RWD ---------- */
@media(max-width:900px){
  .main-nav{position:fixed;top:72px;left:0;right:0;flex-direction:column;background:#fff;border-bottom:1px solid var(--line);padding:12px 20px;gap:2px;display:none;box-shadow:var(--shadow)}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .footer-grid{grid-template-columns:1fr;gap:24px}
}