/* ============================================================
   极智词元官网 · SEO 静态页共享样式
   深色科技主题，与主站 SPA 设计 token 保持一致
   移动端优先，首屏文字优先直出，不被大图阻塞
   ============================================================ */
:root{
  --bg: 215 55% 8%;
  --fg: 214 32% 91%;
  --card: 215 48% 12%;
  --card-fg: 214 32% 91%;
  --primary: 217 91% 60%;
  --primary-fg: 0 0% 100%;
  --accent: 190 90% 45%;
  --muted: 215 35% 16%;
  --muted-fg: 215 18% 62%;
  --border: 215 30% 20%;
  --grad: linear-gradient(135deg, hsl(217 91% 60%), hsl(190 90% 45%));
  --ink: hsl(var(--bg));
  --line: hsl(var(--border));
  --radius: 14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%}
body{
  font-family:ui-sans-serif,system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:hsl(var(--bg));color:hsl(var(--fg));line-height:1.7;font-size:16px;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
h1,h2,h3,h4{line-height:1.25;font-weight:800;letter-spacing:-.01em}
p{text-wrap:pretty}
h1,h2,h3{text-wrap:balance}

.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.section{padding:64px 0}
@media(min-width:768px){.section{padding:96px 0}}

/* ===== 区块标题 ===== */
.sec-head{text-align:center;max-width:720px;margin:0 auto 40px}
.sec-eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:hsl(var(--primary));margin-bottom:12px}
.sec-title{font-size:clamp(24px,4.4vw,40px);margin-bottom:14px}
.sec-desc{color:hsl(var(--muted-fg));font-size:clamp(15px,2vw,17px)}
.divider{width:56px;height:3px;border-radius:2px;background:var(--grad);margin:18px auto 0}

/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:100;background:rgba(11,18,32,.82);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav-inner{display:flex;align-items:center;gap:20px;height:66px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:17px;white-space:nowrap}
.logo-mark{width:30px;height:30px;border-radius:8px;background:var(--grad);display:flex;align-items:center;justify-content:center;font-size:15px;color:#fff}
.nav-links{display:none;gap:26px;margin-left:8px}
.nav-links a{color:hsl(var(--muted-fg));font-size:14px;font-weight:600;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:14px}
.nav-phone{display:none;color:#fff;font-weight:700;font-size:15px;white-space:nowrap;align-items:center;gap:6px}
@media(min-width:900px){.nav-links{display:flex}.nav-phone{display:flex}}
/* 移动端汉堡 */
.nav-toggle{display:none;width:44px;height:44px;border:0;background:transparent;cursor:pointer;flex-direction:column;justify-content:center;gap:5px;align-items:center}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;border-radius:2px;transition:.3s}
@media(max-width:899px){.nav-toggle{display:flex}}
.nav-mobile{display:none;border-top:1px solid rgba(255,255,255,.08);padding:8px 0 16px}
.nav-mobile a{display:block;padding:12px 4px;color:hsl(var(--muted-fg));font-weight:600;border-bottom:1px solid rgba(255,255,255,.05)}
.nav-mobile a:hover{color:#fff}
.nav.open .nav-mobile{display:block}
.nav.open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav.open .nav-toggle span:nth-child(2){opacity:0}
.nav.open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;cursor:pointer;border-radius:12px;font-weight:700;font-size:16px;padding:14px 28px;transition:transform .2s,box-shadow .2s,background .2s;min-height:48px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(14,165,233,.30)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(16,185,129,.38)}
.btn-ghost{background:rgba(255,255,255,.06);color:#fff;border:1px solid rgba(255,255,255,.28)}
.btn-ghost:hover{background:rgba(255,255,255,.12);transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:14px;min-height:44px}

/* ===== Hero ===== */
.hero{position:relative;background:
  radial-gradient(1100px 560px at 72% -10%,rgba(37,99,235,.28),transparent),
  radial-gradient(900px 480px at 8% 110%,rgba(6,182,212,.18),transparent),
  hsl(var(--bg));
  color:#fff;overflow:hidden;padding:64px 0 72px}
@media(min-width:768px){.hero{padding:96px 0 110px}}
.hero-inner{position:relative;z-index:2;max-width:820px;margin:0 auto;text-align:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(37,99,235,.16);border:1px solid rgba(59,130,246,.4);color:#bfdbfe;font-size:13px;font-weight:600;padding:8px 16px;border-radius:999px;margin-bottom:22px}
.hero h1{font-size:clamp(30px,6vw,56px);font-weight:800;margin-bottom:18px}
.hero-sub{color:#94a3b8;font-size:clamp(15px,2.2vw,19px);max-width:720px;margin:0 auto 30px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:40px}
@media(min-width:768px){.hero-stats{grid-template-columns:repeat(4,1fr)}}
.hstat{border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.04);border-radius:16px;padding:18px;text-align:center}
.hstat b{display:block;font-size:clamp(22px,3vw,30px);font-weight:800}
.hstat span{font-size:13px;color:#94a3b8}

/* ===== 卡片网格 ===== */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:repeat(2,1fr)}
@media(min-width:768px){.grid-2{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-4{grid-template-columns:repeat(4,1fr)}}
.card{background:hsl(var(--card));border:1px solid hsl(var(--border));border-radius:var(--radius);padding:28px;transition:transform .25s,border-color .25s,box-shadow .25s;height:100%;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);border-color:rgba(59,130,246,.5);box-shadow:0 18px 40px rgba(2,8,23,.5)}
.card-icon{width:48px;height:48px;border-radius:12px;background:rgba(59,130,246,.14);color:hsl(var(--primary));display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:18px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:hsl(var(--muted-fg));font-size:15px;flex:1}
.card .tag{margin-top:14px;font-size:12px;color:hsl(var(--primary));font-weight:700;letter-spacing:.04em}

/* ===== 步骤 ===== */
.steps{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:768px){.steps{grid-template-columns:repeat(4,1fr)}}
.step{background:hsl(var(--card));border:1px solid hsl(var(--border));border-radius:var(--radius);padding:24px;position:relative}
.step .num{font-size:40px;font-weight:800;color:rgba(59,130,246,.25);font-style:italic;line-height:1}
.step h3{font-size:17px;margin:12px 0 8px}
.step p{color:hsl(var(--muted-fg));font-size:14px}

/* ===== 表格（移动端横向滚动） ===== */
.table-wrap{width:100%;max-width:100%;overflow-x:auto;background:hsl(var(--card));border:1px solid hsl(var(--border));border-radius:var(--radius)}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{padding:14px 18px;text-align:left;white-space:nowrap;border-bottom:1px solid hsl(var(--border));font-size:14px}
thead th{background:rgba(59,130,246,.10);color:#fff;font-weight:700}
tbody tr:last-child td{border-bottom:0}
td.hl{color:hsl(var(--primary));font-weight:700}

/* ===== 规格参数 ===== */
.spec-grid{display:grid;grid-template-columns:1fr;gap:10px 28px;margin-top:16px}
@media(min-width:640px){.spec-grid{grid-template-columns:repeat(2,1fr)}}
.spec-item{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px dashed hsl(var(--border));font-size:14px}
.spec-item span{color:hsl(var(--muted-fg))}
.spec-item b{color:hsl(var(--fg));text-align:right}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chip{font-size:12px;padding:6px 12px;border-radius:999px;background:rgba(6,182,212,.12);border:1px solid rgba(6,182,212,.3);color:#67e8f9}
.device-tag{display:inline-block;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px;margin-bottom:12px}
.device-tag.shipping{background:rgba(16,185,129,.15);color:#6ee7b7;border:1px solid rgba(16,185,129,.4)}
.device-tag.soon{background:rgba(245,158,11,.15);color:#fcd34d;border:1px solid rgba(245,158,11,.4)}

/* ===== FAQ ===== */
.faq{max-width:820px;margin:0 auto}
.faq details{background:hsl(var(--card));border:1px solid hsl(var(--border));border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq summary{cursor:pointer;padding:18px 22px;font-weight:700;font-size:16px;list-style:none;position:relative;padding-right:44px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:20px;top:50%;transform:translateY(-50%);font-size:22px;color:hsl(var(--primary))}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 22px 18px;color:hsl(var(--muted-fg));font-size:15px}

/* ===== 联系卡片 ===== */
.contact-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:768px){.contact-grid{grid-template-columns:repeat(3,1fr)}}
.contact-card{background:hsl(var(--card));border:1px solid hsl(var(--border));border-radius:var(--radius);padding:28px;text-align:center;transition:transform .25s,border-color .25s}
.contact-card:hover{transform:translateY(-4px);border-color:rgba(59,130,246,.5)}
.contact-card .ico{width:52px;height:52px;border-radius:14px;background:rgba(59,130,246,.14);color:hsl(var(--primary));display:flex;align-items:center;justify-content:center;font-size:24px;margin:0 auto 16px}
.contact-card .lbl{font-size:15px;font-weight:700;margin-bottom:6px}
.contact-card .val{font-size:22px;font-weight:800;word-break:break-all}

/* ===== CTA ===== */
.cta{position:relative;overflow:hidden;background:
  radial-gradient(900px 400px at 50% 0%,rgba(37,99,235,.30),transparent),
  hsl(var(--card));
  border:1px solid hsl(var(--border));border-radius:20px;padding:48px 28px;text-align:center}
@media(min-width:768px){.cta{padding:72px 48px}}
.cta h2{font-size:clamp(24px,4vw,40px);margin-bottom:14px}
.cta p{color:hsl(var(--muted-fg));max-width:640px;margin:0 auto 28px;font-size:clamp(15px,2vw,18px)}

/* ===== 页脚 ===== */
.footer{background:hsl(215 55% 6%);border-top:1px solid hsl(var(--border));padding:56px 0 28px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:32px;margin-bottom:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
.footer h4{font-size:15px;margin-bottom:16px;color:#fff}
.footer-col p,.footer-col a{color:hsl(var(--muted-fg));font-size:14px;display:block;margin-bottom:10px;transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-brand p{color:hsl(var(--muted-fg));font-size:14px;max-width:340px;margin-top:12px}
.footer-bottom{border-top:1px solid hsl(var(--border));padding-top:22px;text-align:center;color:hsl(var(--muted-fg));font-size:13px;line-height:1.9}

/* ===== 面包屑 ===== */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:hsl(var(--muted-fg));margin-bottom:20px}
.breadcrumb a:hover{color:#fff}
.breadcrumb .sep{opacity:.5}
.breadcrumb .cur{color:#fff}

/* ===== 入场动画（渐进增强，默认可见） ===== */
.reveal{opacity:1}
.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.js .reveal.in-view{opacity:1;transform:translateY(0)}
@media(prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}