/* 8k-link — Design System v2 */
:root{
  --blue:#0B4F9E; --blue-d:#083a73; --orange:#FF6A2B; --orange-d:#e2551c;
  --ink:#16202b; --muted:#5b6b7b; --line:#e6ebf1; --bg:#f6f8fb; --card:#fff;
  --ok:#1f9d57; --shadow:0 6px 22px rgba(11,79,158,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,Roboto,Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);line-height:1.65}
a{color:var(--blue);text-decoration:none}
img{max-width:100%}
.container{width:min(1140px,92vw);margin:0 auto}
.container.narrow{width:min(880px,92vw)}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 2px 12px rgba(0,0,0,.04)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:900;font-size:22px;color:var(--blue);letter-spacing:.5px;display:flex;align-items:center;gap:2px}
.logo .mark{background:var(--orange);color:#fff;border-radius:8px;padding:2px 8px;display:inline-block;line-height:1.1}
.logo-img{height:34px;width:auto;display:block}
.footer .logo-img{filter:brightness(0) invert(1)}
.nav ul{display:flex;gap:26px;list-style:none;margin:0;padding:0}
.nav a{color:var(--ink);font-weight:600;font-size:15px}
.nav a:hover{color:var(--blue)}
.menu-btn{display:none;background:none;border:0;font-size:24px;cursor:pointer}
@media(max-width:820px){.nav ul{display:none}.menu-btn{display:block}}

/* buttons */
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:700;border:0;cursor:pointer;font-size:15px}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:var(--orange-d)}
.btn-ghost{background:#fff;color:var(--blue);border:1px solid var(--blue)}
.btn-ghost:hover{background:var(--blue);color:#fff}

/* hero */
.hero{background:linear-gradient(135deg,var(--blue),var(--blue-d));color:#fff;padding:64px 0 56px}
.hero h1{font-size:clamp(28px,4vw,46px);margin:0 0 14px;line-height:1.15}
.hero .lead{font-size:18px;max-width:680px;color:#dbe7f7}
.hero .cta{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap}
.hero .badge{display:inline-block;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);padding:5px 12px;border-radius:999px;font-size:13px;margin-bottom:16px}

/* sections */
.section{padding:56px 0}
.section.alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-title{font-size:26px;font-weight:800;margin:0 0 6px}
.section-title.center{text-align:center}
.section-sub{color:var(--muted);text-align:center;margin:0 0 34px;font-size:16px}

/* grid + cards */
.grid{display:grid;gap:22px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.grid.c3,.grid.c4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;box-shadow:var(--shadow)}
.card h3{margin:0 0 8px;font-size:19px}
.card p{margin:0;color:var(--muted);font-size:15px}
.card .ic{width:44px;height:44px;border-radius:10px;background:#eaf1fb;color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:12px}
.card .tag{display:inline-block;font-size:12px;color:var(--orange);font-weight:700;margin-bottom:6px}

/* feature list */
.flist{list-style:none;padding:0;margin:0}
.flist li{padding:10px 0;border-bottom:1px dashed var(--line);display:flex;gap:10px}
.flist li:last-child{border-bottom:0}
.flist .dot{color:var(--ok);font-weight:900}

/* table */
.table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.table th,.table td{padding:12px 14px;text-align:left;font-size:14px;border-bottom:1px solid var(--line)}
.table th{background:var(--blue);color:#fff}
.table tr:nth-child(even) td{background:#f3f7fc}

/* spec / product */
.product{display:flex;flex-direction:column;gap:10px}
.product .ph{height:150px;border-radius:10px;background:linear-gradient(135deg,#eaf1fb,#dbe7f7);display:flex;align-items:center;justify-content:center;color:var(--blue);font-weight:800;font-size:14px}
.product h3{margin:4px 0 0}
.product .meta{font-size:13px;color:var(--muted)}
.product .price{font-weight:800;color:var(--orange)}

/* product image (data-driven) */
.product .pimg{height:170px;border-radius:10px;overflow:hidden;background:#f3f7fc;display:flex;align-items:center;justify-content:center}
.product .pimg img{width:100%;height:100%;object-fit:cover;display:block}
.product .pimg.ph-fallback{background:linear-gradient(135deg,#eaf1fb,#dbe7f7);color:var(--blue);font-weight:800;font-size:14px;text-align:center;padding:0 14px}
.product details{border:0;border-top:1px dashed var(--line);border-radius:0;padding:0;margin:4px 0 0;background:transparent}
.product details summary{font-size:14px;padding:12px 0 8px;color:var(--blue)}
.table.spec{margin-top:4px;box-shadow:none}
.table.spec th,.table.spec td{padding:9px 12px;font-size:13.5px}
.table.spec tr:nth-child(even) td{background:#fff}
.tag-ok,.tag-typ{font-size:11px;font-weight:700;border-radius:999px;padding:2px 8px;margin-left:8px;vertical-align:middle}
.tag-ok{background:#e6f7ee;color:var(--ok)}
.tag-typ{background:#f1f4f8;color:var(--muted)}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:30px}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr}}
form{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:var(--shadow)}
form label{display:block;font-weight:600;margin:14px 0 6px;font-size:14px}
form input,form textarea,form select{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:9px;font-size:15px;font-family:inherit}
form .note{font-size:13px;color:var(--muted);margin-top:10px}
.info-card{background:var(--blue);color:#fff;border-radius:14px;padding:24px}
.info-card h3{margin-top:0}
.info-card .row{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.18);font-size:15px}
.info-card .row:last-child{border-bottom:0}

/* faq */
details{border:1px solid var(--line);border-radius:10px;padding:0 16px;margin-bottom:12px;background:#fff}
details summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"+";color:var(--orange);font-weight:900;margin-right:10px}
details[open] summary::before{content:"−"}
details p{margin:0 0 14px;color:var(--muted)}

/* footer */
.footer{background:var(--ink);color:#cdd6e0;padding:46px 0 26px;margin-top:10px}
.footer .grid{color:#cdd6e0}
.footer h4{color:#fff;margin:0 0 12px;font-size:15px}
.footer a{color:#cdd6e0}
.footer .contact{list-style:none;padding:0;margin:0;font-size:14px;line-height:2}
.footer .copyright{border-top:1px solid #2a3645;margin-top:30px;padding-top:16px;text-align:center;font-size:13px;color:#8b97a6}
.footer .logo{color:#fff}

/* misc */
.breadcrumb{font-size:13px;color:var(--muted);margin:18px 0}
.breadcrumb a{color:var(--muted)}
.pill{display:inline-block;background:#eaf1fb;color:var(--blue);border-radius:999px;padding:4px 12px;font-size:13px;font-weight:600;margin:3px}
.hero-stat{display:flex;gap:30px;margin-top:24px;flex-wrap:wrap}
.hero-stat div{font-size:14px;color:#dbe7f7}
.hero-stat b{display:block;font-size:26px;color:#fff}
@media(max-width:600px){.hero-stat{gap:18px}}