/* ============================================================
   悠悠AI 首页样式（按设计稿重写 2026-10-25）
   ------------------------------------------------------------
   设计语言：
     · 深色星空 Hero，底部弧形过渡到浅色内容区
     · 蓝紫渐变主色（#5B7CFF → #8B6BFF）
     · 大圆角（卡片 20px / 按钮 999px / 面板 24px）
     · 柔和多层阴影，卡片浮起感
     · 中文标题用 800 字重，英文/数字用 tabular-nums
   布局原则：
     · 内容最大宽 1200px，两侧 padding 24px
     · Hero 用 grid 1.05fr 1fr，窄屏单列
     · 所有间距走 4px 栅格
   ============================================================ */

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg-base);
  color:var(--text-primary);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}

/* ---------- 容器 ---------- */
.wrap{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ============================================================
   顶部导航（悬浮胶囊式）
   ============================================================ */
.nav{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb,var(--bg-base) 82%,transparent);
  backdrop-filter:blur(20px) saturate(180%);
  -webkit-backdrop-filter:blur(20px) saturate(180%);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1280px;margin:0 auto;padding:0 24px;
  height:68px;display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:-.01em;flex:0 0 auto}
.brand .logo{
  width:32px;height:32px;border-radius:10px;
  background:var(--brand-grad);
  display:grid;place-items:center;color:#fff;
  box-shadow:0 4px 12px rgba(91,124,255,.35);
}
.brand .logo svg{width:17px;height:17px;stroke:#fff}
.brand .tag{
  font-size:10px;font-weight:700;letter-spacing:.06em;
  padding:2px 6px;border-radius:5px;
  background:var(--brand-soft);color:var(--brand-fg);
  text-transform:uppercase;
}

/* 主导航链接 */
.nav-links{display:flex;align-items:center;gap:4px;flex:1 1 auto;min-width:0}
.nav-links a{
  padding:8px 14px;border-radius:999px;font-size:14px;font-weight:500;
  color:var(--text-secondary);white-space:nowrap;
  transition:color .16s,background .16s;
}
.nav-links a:hover{color:var(--text-primary);background:var(--bg-hover)}
.nav-links a.on{color:var(--text-primary);font-weight:600}

/* 搜索框 */
.nav-search{
  flex:0 1 240px;display:flex;align-items:center;gap:8px;
  height:38px;padding:0 14px;border-radius:999px;
  background:var(--bg-panel);border:1px solid var(--border);
  color:var(--text-muted);font-size:13.5px;min-width:0;
  transition:border-color .16s,background .16s;
}
.nav-search:focus-within{border-color:var(--brand);background:var(--bg-elevated)}
.nav-search svg{width:15px;height:15px;flex:0 0 auto;stroke:currentColor;fill:none;stroke-width:2}
.nav-search input{
  flex:1 1 auto;min-width:0;background:none;border:0;outline:none;
  color:var(--text-primary);font-size:13.5px;
}
.nav-search input::placeholder{color:var(--text-muted)}

.nav-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.nav-actions .btn{white-space:nowrap}

/* 图标按钮 */
.icon-btn{
  width:38px;height:38px;border-radius:999px;
  display:grid;place-items:center;
  color:var(--text-secondary);
  transition:background .16s,color .16s;
}
.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}
.icon-btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* 折叠菜单 */
.nav-menu{
  position:absolute;top:calc(100% + 8px);right:24px;
  min-width:200px;padding:8px;border-radius:16px;
  background:var(--bg-elevated);border:1px solid var(--border);
  box-shadow:0 16px 48px rgba(0,0,0,.4);
  display:flex;flex-direction:column;gap:2px;
}
.nav-menu[hidden]{display:none}
.nav-menu a{
  padding:10px 14px;border-radius:10px;font-size:14px;
  color:var(--text-secondary);transition:background .14s,color .14s;
}
.nav-menu a:hover{background:var(--bg-hover);color:var(--text-primary)}

/* ============================================================
   按钮体系
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 20px;border-radius:999px;
  font-size:14px;font-weight:600;white-space:nowrap;
  border:1px solid transparent;cursor:pointer;
  transition:transform .16s,box-shadow .16s,background .16s,border-color .16s,color .16s;
}
.btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto}
.btn:active{transform:translateY(1px)}

.btn-primary{
  background:var(--brand-grad);color:#fff;
  box-shadow:0 6px 20px rgba(91,124,255,.32);
}
.btn-primary:hover{box-shadow:0 10px 28px rgba(91,124,255,.45);transform:translateY(-1px)}

.btn-secondary{
  background:var(--bg-elevated);color:var(--text-primary);
  border-color:var(--border);
}
.btn-secondary:hover{background:var(--bg-hover);border-color:var(--border-light)}

.btn-ghost{
  background:transparent;color:var(--text-secondary);
  border-color:var(--border);
}
.btn-ghost:hover{color:var(--text-primary);border-color:var(--border-light);background:var(--bg-hover)}

/* 大号按钮 */
.btn-lg{height:50px;padding:0 30px;font-size:15.5px;border-radius:999px}
.btn-lg svg{width:17px;height:17px}

/* Hero 专用：白底实心（在深色星空上最跳） */
.btn-white{background:#fff;color:#0B0F17;border-color:#fff}
.btn-white:hover{background:#F2F4F8;box-shadow:0 10px 28px rgba(255,255,255,.22);transform:translateY(-1px)}

/* Hero 专用：透明描边 */
.btn-outline{background:rgba(255,255,255,.06);color:#E8EDF7;border-color:rgba(255,255,255,.22)}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.4)}

/* ============================================================
   Hero：深色星空 + 底部弧形
   ============================================================ */
.hero{
  position:relative;
  padding:72px 0 0;
  overflow:hidden;
  background:
    radial-gradient(1200px 600px at 72% 8%, rgba(139,107,255,.28) 0%, transparent 62%),
    radial-gradient(900px 520px at 18% 0%, rgba(91,124,255,.22) 0%, transparent 60%),
    radial-gradient(700px 420px at 92% 62%, rgba(56,189,248,.14) 0%, transparent 65%),
    linear-gradient(180deg,#0A0E1A 0%,#0C1120 46%,#0E1426 100%);
  isolation:isolate;
}
/* 星点层 */
.hero::before{
  content:'';position:absolute;inset:0;z-index:-1;opacity:.55;
  background-image:
    radial-gradient(1.6px 1.6px at 12% 18%, #fff, transparent),
    radial-gradient(1.4px 1.4px at 28% 62%, #fff, transparent),
    radial-gradient(1.8px 1.8px at 44% 12%, #fff, transparent),
    radial-gradient(1.2px 1.2px at 58% 74%, #fff, transparent),
    radial-gradient(1.6px 1.6px at 76% 26%, #fff, transparent),
    radial-gradient(1.3px 1.3px at 88% 58%, #fff, transparent),
    radial-gradient(1.5px 1.5px at 34% 86%, #fff, transparent),
    radial-gradient(1.2px 1.2px at 68% 42%, #fff, transparent);
}

.hero-grid{
  position:relative;
  display:grid;grid-template-columns:1.02fr .98fr;
  gap:56px;align-items:center;
  padding-bottom:80px;
}

/* 左侧文案 */
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  height:34px;padding:0 16px;border-radius:999px;
  background:rgba(255,255,255,.07);
  border:1px solid rgba(255,255,255,.14);
  font-size:13px;font-weight:500;color:#C7D2E8;
  backdrop-filter:blur(8px);
  margin-bottom:26px;
}
.hero-badge svg{width:14px;height:14px;stroke:#8B9BFF;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}

.hero h1{
  font-size:clamp(40px,4.6vw,62px);
  line-height:1.14;font-weight:800;letter-spacing:-.025em;
  color:#F4F7FF;margin-bottom:22px;
}
.hero h1 .accent{
  background:linear-gradient(120deg,#7FA0FF 0%,#A78BFA 48%,#7DD3FC 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  font-style:italic;font-weight:900;
  padding-right:2px;
}
.hero .lead{
  font-size:16.5px;line-height:1.75;color:#9BAAC6;
  max-width:520px;margin-bottom:34px;
}

.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:38px}

/* Hero 底部 4 个卖点 */
.hero-meta{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:10px 20px;max-width:600px;
}
.hero-meta span{
  display:flex;align-items:flex-start;gap:8px;
  font-size:12.5px;line-height:1.45;color:#8FA0BE;
}
.hero-meta svg{
  width:16px;height:16px;flex:0 0 auto;margin-top:2px;
  stroke:#6E8BFF;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;
}

.hero-status{margin-top:26px}
.badge{
  display:inline-flex;align-items:center;gap:7px;
  height:28px;padding:0 12px;border-radius:999px;
  font-size:12px;font-weight:600;
}
.badge .dot{width:6px;height:6px;border-radius:50%;background:currentColor;flex:0 0 auto}
.badge.ok{background:rgba(34,197,94,.14);color:#4ADE80}
.badge.ok .dot{box-shadow:0 0 0 3px rgba(34,197,94,.2);animation:pulse 2s infinite}
.badge.err{background:rgba(239,68,68,.14);color:#F87171}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.45}}

/* ---------- Hero 右侧：插画 + 漂浮卡片 ---------- */
.hero-visual{
  position:relative;
  min-height:460px;
  display:grid;place-items:center;
}

/* 中央光晕球 */
.orb{
  position:relative;width:260px;height:260px;border-radius:50%;
  background:
    radial-gradient(circle at 32% 28%, rgba(255,255,255,.9) 0%, rgba(160,180,255,.5) 22%, transparent 46%),
    radial-gradient(circle at 68% 72%, rgba(139,107,255,.85) 0%, rgba(91,124,255,.6) 38%, transparent 66%),
    conic-gradient(from 210deg, #6E8BFF, #A78BFA, #7DD3FC, #6E8BFF);
  box-shadow:
    0 0 90px rgba(110,139,255,.5),
    0 0 180px rgba(139,107,255,.28),
    inset 0 0 60px rgba(255,255,255,.16);
  animation:float 7s ease-in-out infinite;
}
/* 球体高光 */
.orb::after{
  content:'';position:absolute;
  left:22%;top:16%;width:34%;height:26%;
  border-radius:50%;
  background:radial-gradient(circle,rgba(255,255,255,.85),transparent 70%);
  filter:blur(6px);
}
/* 轨道环 */
.orb-ring{
  position:absolute;width:400px;height:400px;border-radius:50%;
  border:1px solid rgba(140,165,255,.16);
  transform:rotate(-18deg) scaleY(.42);
  pointer-events:none;
}
.orb-ring.b{width:490px;height:490px;transform:rotate(24deg) scaleY(.34);border-color:rgba(167,139,250,.13)}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}

/* 漂浮功能卡片 */
.float-card{
  position:absolute;
  padding:12px 16px;border-radius:14px;
  background:rgba(19,26,44,.72);
  border:1px solid rgba(140,165,255,.2);
  backdrop-filter:blur(14px) saturate(160%);
  -webkit-backdrop-filter:blur(14px) saturate(160%);
  box-shadow:0 12px 34px rgba(0,0,0,.42), inset 0 1px 0 rgba(255,255,255,.07);
  min-width:132px;
  animation:float 8s ease-in-out infinite;
}
.float-card .fc-t{font-size:13.5px;font-weight:700;color:#EAF0FF;margin-bottom:3px;white-space:nowrap}
.float-card .fc-s{font-size:11.5px;color:#8496B8;white-space:nowrap}
.float-card:nth-of-type(1){left:-6%;top:8%;animation-delay:-1s}
.float-card:nth-of-type(2){left:-10%;top:44%;animation-delay:-3s}
.float-card:nth-of-type(3){right:-2%;top:20%;animation-delay:-2s}
.float-card:nth-of-type(4){right:4%;top:58%;animation-delay:-4s}

/* 小图标方块 */
.chip-ico{
  position:absolute;width:46px;height:46px;border-radius:13px;
  display:grid;place-items:center;
  background:rgba(24,32,52,.8);border:1px solid rgba(140,165,255,.22);
  box-shadow:0 8px 22px rgba(0,0,0,.35);
  backdrop-filter:blur(10px);
  animation:float 9s ease-in-out infinite;
}
.chip-ico svg{width:22px;height:22px}
.chip-ico:nth-of-type(5){left:8%;top:-2%;animation-delay:-2.5s}
.chip-ico:nth-of-type(6){left:16%;bottom:2%;animation-delay:-5s}
.chip-ico:nth-of-type(7){right:24%;top:-6%;animation-delay:-3.5s}
.chip-ico:nth-of-type(8){right:6%;bottom:8%;animation-delay:-1.5s}

/* ---------- Hero 右缘：热门模型卡 ---------- */
.hot-models{
  position:absolute;right:-8px;top:50%;transform:translateY(-50%);
  width:300px;border-radius:20px;
  background:rgba(255,255,255,.97);
  box-shadow:0 24px 70px rgba(0,0,0,.34);
  padding:18px 0 10px;
  z-index:5;
}
.hot-models .hm-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:0 18px 12px;
}
.hot-models .hm-head h4{font-size:15px;font-weight:700;color:#0B0F17}
.hot-models .hm-head a{font-size:12.5px;color:#6B7891;font-weight:500}
.hot-models .hm-head a:hover{color:#5B7CFF}
.hm-item{
  display:flex;align-items:center;gap:11px;
  padding:10px 18px;cursor:pointer;
  transition:background .14s;
}
.hm-item:hover{background:#F4F6FB}
.hm-logo{
  width:36px;height:36px;border-radius:11px;flex:0 0 auto;
  display:grid;place-items:center;
  background:#F0F3FA;
}
.hm-logo svg{width:20px;height:20px}
.hm-info{flex:1 1 auto;min-width:0}
.hm-info .n{font-size:13.5px;font-weight:600;color:#0B0F17;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hm-info .d{font-size:11.5px;color:#8892A6;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hm-arrow{width:14px;height:14px;flex:0 0 auto;stroke:#B6BFCF;fill:none;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}

/* Hero 底部弧形过渡 */
.hero-arc{
  position:relative;
  height:90px;
  margin-top:-40px;
  pointer-events:none;
}
.hero-arc::after{
  content:'';position:absolute;inset:0;
  background:var(--bg-base);
  border-radius:50% 50% 0 0 / 100% 100% 0 0;
  transform:scaleX(1.9);
  transform-origin:center bottom;
}

/* ============================================================
   通用内容区
   ============================================================ */
.section{padding:88px 0}
.section.tight{padding:56px 0}

.section-head{max-width:640px;margin:0 auto 52px;text-align:center}
.section-head.left{margin-left:0;text-align:left}
.kicker{
  display:inline-flex;align-items:center;gap:7px;
  height:28px;padding:0 13px;border-radius:999px;
  background:var(--brand-soft);color:var(--brand-fg);
  font-size:12.5px;font-weight:700;letter-spacing:.02em;
  margin-bottom:16px;
}
.section-head h2{
  font-size:clamp(28px,3.2vw,40px);line-height:1.22;
  font-weight:800;letter-spacing:-.022em;
  color:var(--text-primary);margin-bottom:14px;
}
.section-head p{font-size:15.5px;line-height:1.7;color:var(--text-secondary)}

/* ============================================================
   能力卡片（4 列浮起卡）
   ============================================================ */
.features{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;
}
.feature{
  position:relative;
  padding:26px 22px 28px;border-radius:18px;
  background:var(--bg-panel);
  border:1px solid var(--border);
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.feature:hover{
  transform:translateY(-4px);
  border-color:var(--brand);
  box-shadow:0 16px 40px rgba(91,124,255,.14);
}
.feature .fi{
  width:44px;height:44px;border-radius:13px;
  display:grid;place-items:center;margin-bottom:18px;
  background:var(--brand-grad-soft);
  border:1px solid var(--brand-soft);
}
.feature .fi svg{
  width:21px;height:21px;
  stroke:var(--brand);fill:none;stroke-width:2;
  stroke-linecap:round;stroke-linejoin:round;
}
.feature h3{
  font-size:15.5px;font-weight:700;letter-spacing:-.01em;
  color:var(--text-primary);margin-bottom:9px;
}
.feature p{
  font-size:13.5px;line-height:1.68;color:var(--text-secondary);
}

/* ============================================================
   模型价格表
   ============================================================ */
.price-wrap{
  border-radius:18px;border:1px solid var(--border);
  background:var(--bg-panel);overflow:hidden;
}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
/* 滚动条 */
.table-scroll::-webkit-scrollbar{height:8px}
.table-scroll::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:999px}

table.price{
  width:100%;border-collapse:collapse;font-size:13.5px;
}
table.price th{
  padding:14px 18px;text-align:left;
  font-size:12.5px;font-weight:600;letter-spacing:.02em;
  color:var(--text-muted);text-transform:uppercase;
  background:var(--bg-shell);
  border-bottom:1px solid var(--border);
  white-space:nowrap;
}
table.price td{
  padding:15px 18px;
  color:var(--text-primary);
  border-bottom:1px solid var(--border);
  white-space:nowrap;
}
table.price tbody tr:last-child td{border-bottom:0}
table.price tbody tr{transition:background .14s}
table.price tbody tr:hover{background:var(--bg-hover)}
table.price td.num{
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum";
}
.price-note{
  display:flex;align-items:flex-start;gap:10px;
  margin-top:18px;padding:14px 18px;border-radius:14px;
  background:var(--bg-panel);border:1px solid var(--border);
  font-size:13px;line-height:1.65;color:var(--text-secondary);
}
.price-note svg{
  width:16px;height:16px;flex:0 0 auto;margin-top:2px;
  stroke:var(--brand);fill:none;stroke-width:2;
  stroke-linecap:round;stroke-linejoin:round;
}
.price-note a{color:var(--brand);font-weight:600}

/* ============================================================
   接入步骤
   ============================================================ */
.steps{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;
  margin-bottom:26px;
}
.step{
  position:relative;padding:26px 22px;border-radius:18px;
  background:var(--bg-panel);border:1px solid var(--border);
}
.step .num{
  width:34px;height:34px;border-radius:11px;
  display:grid;place-items:center;margin-bottom:16px;
  background:var(--brand-grad);color:#fff;
  font-size:15px;font-weight:800;
  font-variant-numeric:tabular-nums;
  box-shadow:0 4px 14px rgba(91,124,255,.32);
}
.step h3{font-size:15.5px;font-weight:700;margin-bottom:9px;color:var(--text-primary)}
.step p{font-size:13.5px;line-height:1.68;color:var(--text-secondary);margin-bottom:12px}
.step code{
  display:inline-block;padding:5px 10px;border-radius:8px;
  background:var(--bg-code);border:1px solid var(--border);
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:12px;color:var(--brand-fg);
  word-break:break-all;
}

/* ============================================================
   代码块
   ============================================================ */
.hero-code,.code-block{
  border-radius:16px;overflow:hidden;
  background:#0D1117;
  border:1px solid rgba(140,165,255,.16);
  box-shadow:0 20px 50px rgba(0,0,0,.3);
}
.hero-code-head,.code-head{
  display:flex;align-items:center;gap:8px;
  padding:11px 16px;
  background:rgba(255,255,255,.035);
  border-bottom:1px solid rgba(255,255,255,.07);
}
.dots{display:flex;gap:6px;margin-right:6px}
.dots i{width:10px;height:10px;border-radius:50%;background:#3D4451;display:block}
.dots i:nth-child(1){background:#FF5F57}
.dots i:nth-child(2){background:#FEBC2E}
.dots i:nth-child(3){background:#28C840}
.hero-code-head .tab,.code-head .tab{
  padding:4px 12px;border-radius:999px;
  font-size:12.5px;font-weight:600;color:#7D8799;
  cursor:pointer;transition:background .14s,color .14s;
}
.hero-code-head .tab:hover,.code-head .tab:hover{color:#C7D2E8;background:rgba(255,255,255,.06)}
.hero-code-head .tab.active,.code-head .tab.active{
  color:#EAF0FF;background:rgba(110,139,255,.2);
}
.hero-code pre,.code-block pre{
  margin:0;padding:20px 22px;overflow-x:auto;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:13px;line-height:1.75;color:#C9D4E4;
  -webkit-overflow-scrolling:touch;
}
.hero-code pre::-webkit-scrollbar,.code-block pre::-webkit-scrollbar{height:8px}
.hero-code pre::-webkit-scrollbar-thumb,.code-block pre::-webkit-scrollbar-thumb{
  background:rgba(255,255,255,.14);border-radius:999px;
}
/* 代码高亮 token（类名与 index.html 脚本里的 codeOf 保持一致：tok-*） */
.tok-com{color:#5C6773;font-style:italic}
.tok-str{color:#C3E88D}
.tok-key{color:#C792EA}
.tok-fn{color:#82AAFF}

/* 模型表格里的模型名单元（JS 动态生成 .model-name > .mi + 文本） */
.model-name{display:flex;align-items:center;gap:9px;font-weight:600}
.model-name .mi{
  width:28px;height:28px;border-radius:9px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--brand-grad-soft);border:1px solid var(--brand-soft);
}
.model-name .mi svg{
  width:15px;height:15px;
  stroke:var(--brand);fill:none;stroke-width:2;
  stroke-linecap:round;stroke-linejoin:round;
}

/* 表格里的 badge 变体 */
.badge.hot{background:var(--warning-soft);color:var(--warning-fg)}
.badge.off{background:var(--bg-hover);color:var(--text-muted)}

/* 表格内等宽数字（JS 给单元格加了 class="mono"） */
table.price td.mono{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-variant-numeric:tabular-nums;font-size:13px;
}

/* ============================================================
   FAQ
   ============================================================ */
#faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{
  border-radius:16px;border:1px solid var(--border);
  background:var(--bg-panel);overflow:hidden;
  transition:border-color .18s,background .18s;
}
.faq-item:hover{border-color:var(--border-light)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:18px 22px;text-align:left;
  font-size:15px;font-weight:600;color:var(--text-primary);
  cursor:pointer;
}
.faq-q::after{
  content:'';flex:0 0 auto;
  width:9px;height:9px;
  border-right:2px solid var(--text-muted);
  border-bottom:2px solid var(--text-muted);
  transform:rotate(45deg);
  transition:transform .22s,border-color .22s;
  margin-top:-3px;
}
.faq-item.open .faq-q::after{
  transform:rotate(-135deg);margin-top:3px;
  border-color:var(--brand);
}
.faq-a{
  max-height:0;overflow:hidden;
  padding:0 22px;
  font-size:14px;line-height:1.75;color:var(--text-secondary);
  transition:max-height .28s ease,padding .28s ease;
}
.faq-item.open .faq-a{max-height:520px;padding:0 22px 20px}

/* ============================================================
   底部 CTA
   ============================================================ */
.cta{
  position:relative;overflow:hidden;
  padding:64px 40px;border-radius:28px;text-align:center;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(139,107,255,.35), transparent 65%),
    radial-gradient(600px 300px at 85% 100%, rgba(91,124,255,.32), transparent 65%),
    linear-gradient(135deg,#131A2E 0%,#0E1426 100%);
  border:1px solid rgba(140,165,255,.18);
  box-shadow:0 28px 70px rgba(0,0,0,.28);
}
.cta h2{
  font-size:clamp(26px,3vw,38px);line-height:1.22;
  font-weight:800;letter-spacing:-.022em;color:#F4F7FF;
  margin-bottom:14px;
}
.cta p{font-size:15.5px;color:#9BAAC6;margin-bottom:30px}
.cta .hero-cta{justify-content:center;margin-bottom:0}

/* ============================================================
   页脚
   ============================================================ */
.footer{
  margin-top:88px;padding:56px 0 32px;
  background:var(--bg-shell);
  border-top:1px solid var(--border);
}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;
  margin-bottom:44px;
}
.footer h4{
  font-size:13px;font-weight:700;letter-spacing:.04em;
  color:var(--text-primary);margin-bottom:16px;
  text-transform:uppercase;
}
.footer ul{display:flex;flex-direction:column;gap:11px}
.footer ul a{
  font-size:13.5px;color:var(--text-secondary);
  transition:color .14s;
}
.footer ul a:hover{color:var(--brand)}
.footer-desc{
  margin-top:16px;font-size:13.5px;line-height:1.72;
  color:var(--text-secondary);max-width:300px;
}
.footer-bottom{
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  padding-top:26px;border-top:1px solid var(--border);
  font-size:12.5px;color:var(--text-muted);
}
.footer-bottom .right{margin-left:auto;display:flex;gap:20px}
.footer-bottom a:hover{color:var(--brand)}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}

/* ============================================================
   Toast
   ============================================================ */
.toast-wrap{
  position:fixed;left:50%;bottom:32px;transform:translateX(-50%);
  z-index:9999;display:flex;flex-direction:column;gap:10px;
  pointer-events:none;
}
.toast{
  padding:12px 22px;border-radius:999px;
  background:var(--bg-elevated);border:1px solid var(--border);
  color:var(--text-primary);font-size:13.5px;font-weight:500;
  box-shadow:0 12px 34px rgba(0,0,0,.32);
  animation:toastIn .24s ease;
}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1100px){
  .features{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero-grid{gap:36px}
  .hot-models{width:270px;right:-4px}
}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:48px;padding-bottom:56px}
  .hero-visual{min-height:380px}
  .hot-models{position:relative;right:auto;top:auto;transform:none;width:100%;max-width:340px;margin:0 auto}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:64px 0}
  .nav-links{display:none}
  .nav-search{display:none}
}

@media (max-width:640px){
  .wrap{padding:0 18px}
  .nav-inner{padding:0 18px;height:60px;gap:14px}
  .hero{padding-top:44px}
  .hero h1{font-size:34px}
  .hero .lead{font-size:15px}
  .hero-meta{grid-template-columns:1fr 1fr}
  .hero-cta .btn{flex:1 1 auto}
  .features{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta{padding:44px 22px;border-radius:22px}
  .float-card{display:none}
  .chip-ico{display:none}
  .orb{width:200px;height:200px}
  .orb-ring{width:300px;height:300px}
  .orb-ring.b{width:360px;height:360px}
  .brand .tag{display:none}
  .section-head h2{font-size:26px}
}

@media (prefers-reduced-motion:reduce){
  .orb,.float-card,.chip-ico{animation:none}
  *{transition-duration:.01ms !important}
}