/* Saike Century — Marketing Site (EN/ZH) */
:root{
  --blue:#1667d9; --blue-d:#0d4aa8; --ink:#1a2433; --mut:#5b6b80;
  --bg:#f6f9fe; --card:#ffffff; --line:#e3ebf6; --accent:#ff7a45;
  --green:#18a058;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* lang toggle */
body.zh .lang-en{display:none}
body:not(.zh) .lang-zh{display:none}
.lang-btn{cursor:pointer;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.4);color:#fff;border-radius:20px;padding:4px 14px;font-size:13px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(13,42,90,.96);backdrop-filter:blur(6px);color:#fff}
.header-in{display:flex;align-items:center;gap:24px;padding:14px 20px;max-width:1120px;margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;white-space:nowrap}
.brand .mark{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,#2f8bff,#1667d9);display:grid;place-items:center;font-size:15px;font-weight:800}
nav.main{display:flex;gap:18px;flex-wrap:wrap;margin-left:auto}
nav.main a{color:#dce8fa;font-size:14.5px;padding:6px 2px;border-bottom:2px solid transparent}
nav.main a:hover,nav.main a[aria-current]{color:#fff;border-bottom-color:#4da3ff}
@media(max-width:860px){nav.main{display:none}}

/* hero */
.hero{color:#fff;background:linear-gradient(135deg,#0d2a5a 0%,#123f8f 55%,#1667d9 100%);position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 85% 20%,rgba(77,163,255,.35),transparent)}
.hero-in{display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center;padding:72px 20px;max-width:1120px;margin:0 auto;position:relative;z-index:1}
.hero h1{font-size:40px;line-height:1.2;margin-bottom:16px}
.hero p.sub{font-size:18px;color:#c9dcf7;margin-bottom:28px}
.hero .badges{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}
.badge{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);border-radius:20px;padding:5px 14px;font-size:13px;color:#e8f1ff}
.btn{display:inline-block;padding:13px 28px;border-radius:8px;font-weight:600;font-size:15px;transition:.2s}
.btn.primary{background:var(--accent);color:#fff}
.btn.primary:hover{background:#f0662f}
.btn.ghost{border:1.5px solid rgba(255,255,255,.6);color:#fff;margin-left:12px}
.btn.ghost:hover{background:rgba(255,255,255,.12)}
/* hero image: fixed 4:3 frame, contain so portrait & landscape never distort */
.hero-media{
  width:100%;aspect-ratio:4/3;max-height:440px;
  border-radius:14px;overflow:hidden;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.16);
  box-shadow:0 24px 60px rgba(0,0,0,.35);
  display:grid;place-items:center;
}
.hero-media img{width:100%;height:100%;object-fit:contain;display:block}
/* landscape hero keeps a wider, shallower frame */
.hero-media.wide{aspect-ratio:16/10;max-height:400px}
/* portrait hero: narrower frame so the tall subject stays comfortably sized */
.hero-img{border-radius:14px;box-shadow:0 24px 60px rgba(0,0,0,.35)}
@media(max-width:860px){
  .hero-in{grid-template-columns:1fr;padding:48px 20px;gap:28px}
  .hero h1{font-size:30px}
  .hero-media{max-height:320px}
  .hero-media.wide{max-height:260px}
}

/* sections */
section{padding:72px 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 48px}
.eyebrow{color:var(--blue);font-weight:700;font-size:14px;letter-spacing:.08em;text-transform:uppercase}
h2{font-size:32px;line-height:1.25;margin:8px 0 14px}
.sec-head p{color:var(--mut)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:900px){.grid-3,.grid-4{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.grid-3,.grid-4,.grid-2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 4px 16px rgba(20,50,100,.05)}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--mut);font-size:15px}
.card .ico{width:48px;height:48px;border-radius:12px;background:#e8f1ff;display:grid;place-items:center;font-size:24px;margin-bottom:16px}
/* framed image block: consistent height across grids */
.imgcard{
  border-radius:14px;overflow:hidden;
  box-shadow:0 10px 30px rgba(20,50,100,.12);
  background:#eef4fc;
  width:100%;aspect-ratio:16/10;
  display:grid;place-items:center;
}
.imgcard img{width:100%;height:100%;object-fit:cover;display:block}
/* portrait source images: contain inside a taller 4:5 frame, soft backdrop */
.imgcard.portrait{background:linear-gradient(180deg,#f2f7ff,#e6eefa);aspect-ratio:4/5;max-height:560px}
.imgcard.portrait img{object-fit:contain}
.imgcard.plain{background:#fff;box-shadow:none;aspect-ratio:auto}
.imgcard.plain img{object-fit:contain}
/* in dark sections the frame backdrop should be dark */
.dark .imgcard{background:#16294a;box-shadow:0 10px 30px rgba(0,0,0,.3)}
.dark .imgcard.portrait{background:linear-gradient(180deg,#16294a,#1c3055)}
.dark{background:#0f2038;color:#e8f1ff}
.dark .sec-head p{color:#9db8dd}
.dark .card{background:#16294a;border-color:#25436f}
.dark .card p{color:#a9c1e4}
.dark .card .ico{background:#25436f}

/* product cards on home */
.prod-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.prod-card .thumb{width:100%;aspect-ratio:16/10;overflow:hidden;background:#eef4fc;display:grid;place-items:center}
.prod-card .thumb img{width:100%;height:100%;object-fit:cover;display:block}
.prod-card .thumb.portrait{background:linear-gradient(180deg,#f2f7ff,#e6eefa)}
.prod-card .thumb.portrait img{object-fit:contain;padding:6px}
.prod-card .body{padding:24px;display:flex;flex-direction:column;gap:10px;flex:1}
.prod-card .tag{font-size:12.5px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:.06em}
.prod-card a.more{font-weight:600;margin-top:auto}

/* specs table */
.spec{width:100%;border-collapse:collapse;font-size:15px}
.spec th,.spec td{border:1px solid var(--line);padding:10px 14px;text-align:left}
.spec th{background:#eef4fc;width:30%}

/* steps */
.step{position:relative;padding-left:56px;margin-bottom:28px}
.step .n{position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:700}

/* CTA band */
.cta-band{background:linear-gradient(120deg,#1667d9,#2f8bff);color:#fff;text-align:center;border-radius:18px;padding:56px 28px}
.cta-band h2{color:#fff}

/* contact form */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
label{font-size:14px;font-weight:600;display:block;margin-bottom:6px}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid #c9d6e8;border-radius:8px;font:inherit;background:#fff}
input:focus,textarea:focus,select:focus{outline:2px solid var(--blue);border-color:transparent}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}

/* footer */
.site-footer{background:#0b1a30;color:#93a9c9;padding:56px 0 28px;font-size:14.5px}
.footer-in{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;max-width:1120px;margin:0 auto;padding:0 20px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer a{display:block;color:#93a9c9;padding:4px 0}
.site-footer a:hover{color:#fff}
.copyright{border-top:1px solid #1c3050;margin-top:36px;padding-top:22px;text-align:center;font-size:13px;color:#67809f}
@media(max-width:760px){.footer-in{grid-template-columns:1fr 1fr}}

/* misc */
.checklist{list-style:none}
.checklist li{padding:7px 0 7px 30px;position:relative;color:var(--ink)}
.checklist li::before{content:"✓";position:absolute;left:0;top:7px;width:20px;height:20px;border-radius:50%;background:#e2f5ea;color:var(--green);font-size:12px;display:grid;place-items:center;font-weight:700}
.stat{font-size:34px;font-weight:800;color:var(--blue)}
.stat-label{font-size:14px;color:var(--mut)}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px 22px;margin-bottom:12px}
.faq summary{font-weight:600;cursor:pointer}
.faq p{margin-top:10px;color:var(--mut);font-size:15px}