:root{
  /* 品牌 VI：蓝 #2D348D · 红 #BD202F · 黑 #000000 三色 */
  --red:#BD202F; --red-d:#9C1826; --red-t:#FAEEF0;
  --blue:#2D348D; --blue-d:#222A77; --blue-t:#EFF1FA;
  --ink:#0B0B0C; --ink-2:#272A31;
  --muted:#666B73; --line:#E4E5E8; --bg:#ffffff; --bg-2:#F6F6F8;
  --wrap:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","Helvetica Neue",Arial,"Noto Sans",sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .6em;letter-spacing:-.01em;color:#000}
h1{font-size:clamp(30px,4.6vw,52px);font-weight:700}
h2{font-size:clamp(24px,3vw,34px);font-weight:700}
h3{font-size:19px;font-weight:650}
p{margin:0 0 1em}
.lead{font-size:clamp(17px,1.6vw,20px);color:var(--ink-2)}
.eyebrow .tm{font-size:.7em;line-height:0;vertical-align:super;display:inline-block;margin-inline-start:2px;letter-spacing:0}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--red);font-weight:700;margin-bottom:14px}
.section{padding:84px 0}
.section--alt{background:var(--blue-t)}
.muted{color:var(--muted)}

/* header */
header{position:sticky;top:0;z-index:50;background-color:rgba(255,255,255,.96);background-image:linear-gradient(90deg,var(--blue) 0 50%,var(--red) 50% 100%);background-repeat:no-repeat;background-size:100% 3px;background-position:top left;backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px;gap:24px}
.nav img.logo{height:34px;width:auto;flex-shrink:0}
.nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0;font-size:15px;font-weight:550}
.nav ul a{position:relative;padding:6px 0;color:var(--ink-2)}
.nav ul a:hover{color:var(--blue)}
.nav ul a.active{color:var(--red)}
.nav ul a.active:after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--red)}
.lang{display:flex;gap:6px;font-size:13px;align-items:center;border-left:1px solid var(--line);padding-left:18px}
.lang a{color:var(--muted);padding:2px 4px;display:inline-flex;align-items:center;justify-content:center;min-height:32px;min-width:30px}
.lang a.on{color:var(--ink);font-weight:700}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:6px;padding:8px 10px;font-size:18px;cursor:pointer}

/* hero */
.hero{position:relative;color:#fff;background:#0B0B0C;overflow:hidden}
.hero .bg{position:absolute;inset:0;object-fit:cover;width:100%;height:100%;opacity:.62}
.hero .veil{position:absolute;inset:0;background:linear-gradient(100deg,rgba(9,12,16,.95) 0%,rgba(9,12,16,.62) 42%,rgba(9,12,16,.12) 100%)}
.hero .inner{position:relative;padding:120px 0 108px;max-width:760px}
.hero--band .inner{padding:58px 0 50px;max-width:860px}
.hero--band h1{font-size:clamp(28px,3.4vw,42px);margin-bottom:12px}
.hero--band p{font-size:16px;color:#c9d1d9;max-width:720px}
.hero h1{color:#fff;margin-bottom:18px}
.hero p{color:#c9d1d9;font-size:clamp(16px,1.7vw,19px);max-width:620px}
.hero .tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.tag{font-size:13px;border:1px solid rgba(255,255,255,.28);border-radius:100px;padding:6px 14px;color:#e6edf3}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--red);color:#fff;padding:13px 24px;border-radius:6px;font-weight:650;font-size:15px;border:0;cursor:pointer}
.btn:hover{background:var(--red-d)}
.btn--blue{background:var(--blue)}
.btn--blue:hover{background:var(--blue-d)}
.btn--ghost{background:transparent;border:1px solid rgba(255,255,255,.4)}
.btn--ghost:hover{background:rgba(255,255,255,.1)}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}

/* grid + cards */
.grid{display:grid;gap:22px}
.grid > *{min-width:0}   /* 防止子项被宽表格撑破，导致整页横向溢出 */
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;transition:.18s}
.card:hover{border-color:var(--blue);box-shadow:0 10px 28px rgba(11,11,12,.09);transform:translateY(-2px)}
/* 出货页视频 */
.videobox{background:#111 url(../img/video-poster.jpg) center/cover no-repeat;border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.videobox video{display:block;width:100%;height:auto;max-height:560px;background:#000}
@media(min-width:900px){.videobox{max-width:820px}}

.card .ph{aspect-ratio:4/3;background:var(--bg-2);overflow:hidden}
.card .ph img{width:100%;height:100%;object-fit:cover}
.card .bd{padding:20px 22px 24px}
.card h3{margin-bottom:8px}
.card p{font-size:14.5px;color:var(--muted);margin:0}
.card .more{display:inline-block;margin-top:14px;font-size:13.5px;font-weight:650;color:var(--blue)}
.card .more:hover{color:var(--red)}

/* spec table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;background:#fff}
table{border-collapse:collapse;width:100%;font-size:14.5px;min-width:560px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line)}
th{background:var(--blue);font-weight:650;font-size:12.5px;letter-spacing:.04em;text-transform:uppercase;color:#fff}
tr:last-child td{border-bottom:0}
td strong{font-weight:650}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;text-align:left}
.stat .n{font-size:clamp(28px,3.4vw,40px);font-weight:750;letter-spacing:-.02em}
.stat .l{font-size:13.5px;color:var(--muted);margin-top:4px}
.stat .n span{color:var(--red)}

/* cert list */
.cert{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
.cert:last-child{border-bottom:0}
.cert .badge{flex:0 0 46px;height:46px;border-radius:8px;background:#f0f2f5;display:grid;place-items:center;font-size:11px;font-weight:750;color:var(--blue);text-align:center;line-height:1.1}
.cert h4{margin:0 0 4px;font-size:15.5px}
.cert p{margin:0;font-size:14px;color:var(--muted)}

/* band */
.band{background:#0B0B0C;color:#fff;padding:64px 0}
.band h2{color:#fff}
.band p{color:#aab4bf}
.band .grid{gap:32px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px}
.info dt{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:22px}
.info dd{margin:4px 0 0;font-size:15.5px}
form{display:grid;gap:14px}
label{font-size:13px;font-weight:600;color:var(--ink-2)}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid #d5d9df;border-radius:6px;font:inherit;font-size:15px;background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid rgba(45,52,141,.22);border-color:var(--blue)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* footer */
/* WhatsApp 悬浮按钮 */
.wa-float{position:fixed;right:20px;bottom:20px;z-index:80;width:56px;height:56px;border-radius:50%;
  background:var(--blue);color:#fff;display:grid;place-items:center;box-shadow:0 6px 20px rgba(11,11,12,.3);
  transition:transform .15s, box-shadow .15s}
.wa-float:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,0,0,.34)}
@media(max-width:620px){.wa-float{right:14px;bottom:14px;width:52px;height:52px}}

footer{background:#0B0B0C;color:#9BA1A8;padding:56px 0 28px;font-size:14px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
footer h5{color:#fff;font-size:13px;letter-spacing:.1em;text-transform:uppercase;margin:0 0 14px}
footer a:hover{color:var(--red)}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
footer .bar{margin-top:40px;padding-top:20px;border-top:1px solid #1c222a;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px}
footer img.logo{height:30px;margin-bottom:16px}

@media(max-width:900px){
  .g3,.g4,.stats,.contact-grid,footer .cols{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .nav ul{display:none}
  .burger{display:block}
  .nav ul.open{display:flex;position:absolute;top:74px;left:0;right:0;background:#fff;flex-direction:column;padding:18px 24px 26px;gap:16px;border-bottom:1px solid var(--line)}
  .section{padding:60px 0}
  .hero .inner{padding:80px 0 72px}
}
@media(max-width:620px){
  table{min-width:0}
  .table-wrap{max-width:100%}
  .g2,.g3,.g4,.stats,footer .cols,.row2{grid-template-columns:1fr}
  .stats{gap:28px}
}

/* ---------- 阿拉伯语 RTL ---------- */
[dir="rtl"]{direction:rtl}
[dir="rtl"] body{text-align:right}
[dir="rtl"] ul,[dir="rtl"] ol{padding-right:18px;padding-left:0}
[dir="rtl"] .lang{border-left:0;border-right:1px solid var(--line);padding-left:0;padding-right:18px}
[dir="rtl"] .hero .veil{background:linear-gradient(260deg,rgba(9,12,16,.94) 0%,rgba(9,12,16,.72) 48%,rgba(9,12,16,.35) 100%)}
[dir="rtl"] .cert{padding-right:0}
[dir="rtl"] th,[dir="rtl"] td{text-align:right}
[dir="rtl"] p[style*="border-left"]{border-left:0!important;border-right:3px solid var(--red)!important;padding-left:0!important;padding-right:14px!important}
[dir="rtl"] .card .more{display:inline-block}
[dir="rtl"] .nav ul{gap:24px}
@media(max-width:900px){[dir="rtl"] .nav ul.open{text-align:right}}

/* ---------- 导航栏社交图标（2026-10-26，实心 VI 红蓝） ---------- */
.nav .social-nav{display:flex;align-items:center;gap:9px;margin-right:-6px}
.nav .social-nav a{display:flex;align-items:center;justify-content:center;width:27px;height:27px;
  border-radius:50%;background:var(--blue);transition:transform .18s,background .18s,box-shadow .18s}
.nav .social-nav a:nth-child(2){background:var(--red)}
.nav .social-nav svg{width:14px;height:14px;fill:#fff}
.nav .social-nav a:hover{transform:translateY(-1px);box-shadow:0 4px 10px rgba(11,11,12,.22)}
.nav .social-nav a:hover:nth-child(1){background:var(--blue-d)}
.nav .social-nav a:hover:nth-child(2){background:var(--red-d)}
@media(max-width:1100px){.nav{gap:14px}.nav .social-nav{display:none}}
[dir="rtl"] .nav .social-nav{margin-right:0;margin-left:-6px}

/* 注册商标符号：上标、不撑行高 */
sup.rmark{font-size:.62em;vertical-align:super;line-height:0;font-weight:600;margin-left:1px}

/* 技术文章页：正文 + 粘性目录，解决长文右侧大片空白 */
.guide-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:56px;align-items:start}
.guide-main{max-width:820px;min-width:0}
.guide-main h2{scroll-margin-top:86px}
.guide-aside{position:sticky;top:22px}
.toc{border-left:2px solid var(--border);padding-left:16px}
.toc-title{font-size:11.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin-bottom:12px;font-weight:700}
.toc ul{list-style:none;padding:0;margin:0}
.toc li{margin-bottom:9px;font-size:13.5px;line-height:1.45}
.toc a{color:var(--muted);text-decoration:none}
.toc a:hover{color:var(--red)}
.toc-cta{margin-top:22px;padding-top:16px;border-top:1px solid var(--border)}
.btn--sm{display:inline-block;margin-top:2px}
@media(max-width:980px){.guide-layout{grid-template-columns:1fr;gap:0}.guide-aside{display:none}.guide-main{max-width:none}}