/* ============================================================
   LinkRack 调试助手 — 产品站样式
   纯静态，无外部依赖（字体使用系统字体栈）
   ============================================================ */

:root{
  --bg:#F7F7F4;
  --surface:#FFFFFF;
  --ink:#111318;
  --ink-2:#343A44;
  --muted:#6B717C;
  --line:rgba(17,19,24,.10);
  --line-strong:rgba(17,19,24,.16);
  --accent:#2437D6;
  --accent-deep:#1A2AB0;
  --accent-soft:#EDF0FF;
  --radius:14px;
  --radius-lg:22px;
  --maxw:1140px;
  --nav-h:66px;
  --shadow-sm:0 1px 2px rgba(17,19,24,.06);
  --shadow-md:0 16px 40px -18px rgba(17,19,24,.22);
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--nav-h) + 18px);
}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

img,svg{display:block;max-width:100%}
a{color:inherit}
h1,h2,h3,h4,p,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit}

::selection{background:rgba(36,55,214,.16)}

:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
  border-radius:6px;
}

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 10px 0;
  text-decoration:none;font-size:14px;
}
.skip:focus{left:0}

.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(20px,5vw,40px);
}

/* ============ 通用排版 ============ */

.eyebrow{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--muted);
  margin-bottom:20px;
}
.eyebrow-dot{
  width:5px;height:5px;border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px rgba(36,55,214,.14);
  flex:0 0 auto;
}

h2{
  font-size:clamp(27px,3.5vw,42px);
  line-height:1.16;
  letter-spacing:-.024em;
  font-weight:700;
}

.sec-sub{
  margin-top:16px;
  color:var(--muted);
  font-size:16.5px;
  line-height:1.72;
  max-width:34em;
}

.sec{padding:clamp(64px,8.5vw,112px) 0}
.sec-white{background:var(--surface);border-block:1px solid var(--line)}

.sec-head{max-width:640px;margin-bottom:clamp(34px,4.6vw,56px)}

/* ============ 按钮 ============ */

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;
  border-radius:10px;
  border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);
}
.btn svg{transition:transform .2s var(--ease)}

.btn-primary{
  background:var(--accent);color:#fff;
  box-shadow:0 1px 2px rgba(36,55,214,.28),0 8px 20px -10px rgba(36,55,214,.6);
}
.btn-primary:hover{background:var(--accent-deep);transform:translateY(-1px);box-shadow:0 2px 4px rgba(36,55,214,.3),0 14px 28px -12px rgba(36,55,214,.7)}
.btn-primary:active{transform:translateY(0)}
.btn-primary:hover svg{transform:translateY(1px)}

.btn-ghost{
  background:transparent;color:var(--ink-2);
  border-color:var(--line-strong);
}
.btn-ghost:hover{background:rgba(17,19,24,.04);border-color:rgba(17,19,24,.28);color:var(--ink)}
.btn-ghost:hover svg{transform:translateY(2px)}

.btn-light{background:#fff;color:var(--ink)}
.btn-light:hover{background:#E9ECF5;transform:translateY(-1px)}
.btn-light:hover svg{transform:translateY(1px)}

.btn-ghost-light{background:transparent;color:rgba(255,255,255,.86);border-color:rgba(255,255,255,.24)}
.btn-ghost-light:hover{background:rgba(255,255,255,.10);color:#fff;border-color:rgba(255,255,255,.42)}

.btn-sm{height:38px;padding:0 16px;font-size:14px;border-radius:9px}

/* ============ 导航 ============ */

.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;
  background:rgba(247,247,244,.72);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .25s var(--ease),background .25s var(--ease),box-shadow .25s var(--ease);
}
.nav.is-scrolled{
  background:rgba(247,247,244,.9);
  border-bottom-color:var(--line);
  box-shadow:0 8px 24px -22px rgba(17,19,24,.5);
}

.nav-inner{
  display:flex;align-items:center;gap:28px;
  width:100%;
}

.brand{
  display:inline-flex;align-items:center;gap:9px;
  text-decoration:none;color:var(--ink);
  margin-right:auto;
}
.brand-mark{color:var(--ink);flex:0 0 auto}
.brand-name{
  font-size:17px;font-weight:700;letter-spacing:-.02em;
}
.brand-tag{
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.06em;
  color:var(--muted);
  border:1px solid var(--line-strong);
  border-radius:4px;
  padding:2px 5px;
  margin-left:1px;
}

.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{
  position:relative;
  font-size:14.5px;color:var(--muted);text-decoration:none;
  transition:color .18s var(--ease);
  padding:6px 0;
}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1.5px;
  background:var(--accent);
  transform:scaleX(0);transform-origin:left;
  transition:transform .24s var(--ease);
}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after,
.nav-links a[aria-current="true"]::after{transform:scaleX(1)}
.nav-links a[aria-current="true"]{color:var(--ink)}

.nav-actions{display:flex;align-items:center;gap:18px}

.menu-btn{
  display:none;
  width:40px;height:40px;padding:0;
  align-items:center;justify-content:center;flex-direction:column;gap:5px;
  background:transparent;border:1px solid var(--line-strong);border-radius:9px;
  cursor:pointer;
}
.menu-btn span{
  display:block;width:16px;height:1.5px;background:var(--ink);
  transition:transform .25s var(--ease),opacity .25s var(--ease);
}
.nav.is-open .menu-btn span:first-child{transform:translateY(3.25px) rotate(45deg)}
.nav.is-open .menu-btn span:last-child{transform:translateY(-3.25px) rotate(-45deg)}

/* ============ 首屏 ============ */

.hero{
  position:relative;
  padding-top:calc(var(--nav-h) + clamp(52px,7vw,92px));
  padding-bottom:clamp(44px,6vw,84px);
  overflow:hidden;
}
.hero-bg{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(760px 460px at 84% -6%,rgba(36,55,214,.10),transparent 68%),
    radial-gradient(520px 380px at 2% 4%,rgba(223,90,43,.05),transparent 70%);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(to right,rgba(17,19,24,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(17,19,24,.045) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(720px 480px at 62% 26%,#000,transparent 78%);
  mask-image:radial-gradient(720px 480px at 62% 26%,#000,transparent 78%);
}

.hero-grid{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);
  gap:clamp(34px,4.4vw,56px);
  align-items:center;
}

h1{
  font-size:clamp(34px,4.6vw,62px);
  line-height:1.08;
  letter-spacing:-.035em;
  font-weight:700;
}
.grad{
  background:linear-gradient(96deg,var(--accent) 8%,#5B74FF 56%,#8A98FF 100%);
  -webkit-background-clip:text;background-clip:text;
  color:transparent;
  -webkit-text-fill-color:transparent;
}

.lede{
  margin-top:22px;
  max-width:31em;
  font-size:16.5px;
  line-height:1.74;
  color:var(--ink-2);
}

.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}

.hero-meta{
  display:flex;flex-wrap:wrap;align-items:center;
  margin-top:28px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.02em;color:var(--muted);
}
.hero-meta li{display:flex;align-items:center}
.hero-meta li + li::before{
  content:"";width:1px;height:11px;background:var(--line-strong);
  margin:0 13px;
}

/* ============ 产品截图 ============ */

.hero-visual{position:relative}

.shot{
  margin:0;
  border-radius:10px;
  overflow:hidden;
  border:1px solid rgba(17,19,24,.14);
  background:#fff;
  box-shadow:
    0 40px 80px -44px rgba(13,15,20,.55),
    0 2px 8px rgba(13,15,20,.10);
}
.shot img{
  display:block;
  width:100%;height:auto;
}

.chip{
  position:absolute;
  font-size:11.5px;font-weight:550;
  color:var(--ink-2);
  background:rgba(255,255,255,.95);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border:1px solid var(--line-strong);
  border-radius:100px;
  padding:6px 12px;
  box-shadow:0 12px 26px -16px rgba(17,19,24,.5);
  white-space:nowrap;
}
.chip-b{right:-8px;top:-31px}

/* ============ 数据条 ============ */

.stats{
  padding:clamp(26px,3.2vw,36px) 0;
  border-block:1px solid var(--line);
  background:rgba(255,255,255,.55);
}
.stats-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:0;
}
.stats-grid > div{
  display:flex;flex-direction:column;gap:4px;
  padding-left:22px;
  border-left:1px solid var(--line);
}
.stats-grid > div:first-child{padding-left:0;border-left:0}
.stats-grid b{
  font-size:clamp(21px,2.4vw,27px);
  font-weight:700;letter-spacing:-.03em;line-height:1.15;
}
.stats-grid span{font-size:12.5px;color:var(--muted)}

/* ============ 差异对照 ============ */

.diff{
  --c1:196px;
  --c2:232px;
  position:relative;
  border-top:1px solid var(--line-strong);
}
.diff::after{
  content:"";position:absolute;top:0;bottom:0;right:0;
  width:calc(100% - var(--c1) - var(--c2));
  background:rgba(36,55,214,.045);
  border-left:1px solid rgba(36,55,214,.13);
  pointer-events:none;
  z-index:0;
}

.diff-h,
.diff-r{
  display:grid;
  grid-template-columns:var(--c1) var(--c2) minmax(0,1fr);
  position:relative;
  z-index:1;
}

.diff-h{border-bottom:1px solid var(--line-strong)}
.diff-h span{
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);
  padding:12px 0;
}
.diff-h span:nth-child(2){padding-right:24px}
.diff-h span:nth-child(3){color:var(--accent);padding-left:22px}

.diff-r{border-bottom:1px solid var(--line)}
.diff-r p{font-size:14.6px;line-height:1.62}

.diff-r .c1{padding:17px 24px 17px 0;font-weight:600;letter-spacing:-.005em}
.diff-r .c2{padding:17px 24px 17px 0;color:var(--muted)}
.diff-r .c3{padding:17px 0 17px 22px;color:var(--ink-2)}

.diff .lbl{display:none}

/* ============ 四个重点 ============ */

.pillars{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  border-top:1px solid var(--line-strong);
  border-left:1px solid var(--line);
}
.pillar{
  padding:clamp(26px,3vw,36px);
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.pillar-n{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;
  color:var(--accent);
}
.pillar h3{
  font-size:19px;font-weight:700;letter-spacing:-.015em;
  margin-top:10px;
}
.pillar-lead{
  margin-top:6px;
  font-size:15px;font-weight:600;color:var(--ink-2);
}
.pillar-body{
  margin-top:10px;
  font-size:14.2px;line-height:1.72;color:var(--muted);
}
.pillar ul{
  margin-top:18px;
  display:flex;flex-direction:column;gap:8px;
}
.pillar li{
  position:relative;
  padding-left:16px;
  font-size:13.6px;line-height:1.6;color:var(--ink-2);
}
.pillar li::before{
  content:"";position:absolute;left:0;top:9px;
  width:6px;height:1.5px;background:var(--accent);opacity:.55;
}

/* ============ 功能清单 ============ */

.specs{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  column-gap:clamp(26px,3.4vw,44px);
  border-top:1px solid var(--line-strong);
}
.spec{
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.spec h4{
  font-size:15px;font-weight:650;letter-spacing:-.008em;
}
.spec p{
  margin-top:7px;
  font-size:13.8px;line-height:1.66;color:var(--muted);
}

/* ============ 外观 ============ */

.themes{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:18px;
}
.theme-card{
  margin:0;
  border-radius:12px;
  overflow:hidden;
  border:1px solid var(--line-strong);
  box-shadow:0 20px 48px -36px rgba(17,19,24,.6);
}
.theme-card figcaption{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;
  padding:10px 14px;
  font-size:12.5px;
  font-weight:600;
}
.theme-card figcaption span{
  font-family:var(--font-mono);
  font-size:9.5px;font-weight:400;letter-spacing:.1em;text-transform:uppercase;
}
.theme-card img{display:block;width:100%;height:auto}

.theme-card.is-light{background:#F2F4F7}
.theme-card.is-light figcaption{background:#F2F4F7;color:#33383F;border-bottom:1px solid rgba(17,19,24,.09)}
.theme-card.is-light figcaption span{color:#8E95A3}

.theme-card.is-dark{background:#1B1F26;border-color:#1B1F26}
.theme-card.is-dark figcaption{background:#1B1F26;color:#E6E9F2;border-bottom:1px solid rgba(255,255,255,.09)}
.theme-card.is-dark figcaption span{color:#6E7688}

/* ============ 边界 ============ */

.limits-grid{
  display:grid;
  grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);
  gap:clamp(36px,5vw,72px);
  align-items:start;
}

.no-list{border-top:1px solid var(--line-strong)}
.no-list li{
  position:relative;
  padding:17px 0 17px 28px;
  border-bottom:1px solid var(--line);
}
.no-list li::before{
  content:"";position:absolute;left:2px;top:24px;
  width:11px;height:1.5px;background:var(--ink);opacity:.42;
}
.no-list b{
  display:block;
  font-size:15px;font-weight:650;letter-spacing:-.008em;
}
.no-list span{
  display:block;
  margin-top:4px;
  font-size:13.8px;line-height:1.62;color:var(--muted);
}

.cost-note{
  margin-top:26px;
  padding:18px 20px;
  background:rgba(17,19,24,.035);
  border-left:2px solid var(--ink);
  font-size:13.8px;line-height:1.74;color:var(--ink-2);
  border-radius:0 8px 8px 0;
}
.cost-note b{font-weight:700}

/* ============ 授权 ============ */

.lic{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:18px;
}
.lic-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:26px 24px 28px;
  transition:border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.lic-card:hover{border-color:var(--line-strong);box-shadow:var(--shadow-sm)}
.lic-k{
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);
}
.lic-card h3{
  font-size:17px;font-weight:650;letter-spacing:-.012em;
  margin-top:12px;
}
.lic-card p{
  margin-top:9px;
  font-size:14px;line-height:1.7;color:var(--muted);
}

/* ============ 硬件预告 ============ */

#hardware{padding-bottom:clamp(28px,3.6vw,48px)}

.hw{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:clamp(24px,3vw,40px);
  align-items:center;
  padding:clamp(26px,3.4vw,36px);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  background:linear-gradient(180deg,#fff 0%,#FCFBF8 100%);
}
.hw-badge{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.12em;
  color:#fff;background:var(--ink);
  padding:3px 8px;border-radius:4px;
}
.hw h3{
  font-size:19px;font-weight:700;letter-spacing:-.015em;
  margin-top:14px;
}
.hw p{
  margin-top:10px;
  max-width:62ch;
  font-size:14.4px;line-height:1.74;color:var(--muted);
}
.hw p b{color:var(--ink-2);font-weight:650}
.hw-chips{
  display:flex;flex-direction:column;gap:8px;
  align-items:flex-end;
}
.hw-chips span{
  font-size:12.5px;color:var(--ink-2);
  border:1px solid var(--line-strong);
  border-radius:100px;
  padding:5px 12px;
  white-space:nowrap;
}

/* ============ 下载 ============ */

#download{padding-top:clamp(20px,2.6vw,36px)}

.cta-panel{
  position:relative;
  border-radius:var(--radius-lg);
  background:#101218;
  overflow:hidden;
  padding:clamp(40px,6vw,64px) clamp(26px,5vw,56px);
}
.cta-glow{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(620px 320px at 82% -18%,rgba(76,107,255,.5),transparent 66%),
    radial-gradient(420px 260px at 4% 122%,rgba(36,55,214,.32),transparent 70%);
}
.cta-panel::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(620px 300px at 68% 18%,#000,transparent 76%);
  mask-image:radial-gradient(620px 300px at 68% 18%,#000,transparent 76%);
}
.cta-body{position:relative;z-index:1;max-width:640px;margin-inline:auto;text-align:center}
.cta-body h2{color:#fff;font-size:clamp(26px,3.4vw,38px)}
.cta-body p{
  margin-top:18px;
  color:rgba(255,255,255,.66);
  font-size:15.5px;line-height:1.72;
}
.cta-body .cta-row{margin-top:30px;justify-content:center}
.cta-note{
  margin-top:22px !important;
  font-family:var(--font-mono);
  font-size:11px !important;
  letter-spacing:.03em;
  color:rgba(255,255,255,.42) !important;
}

/* ============ 页脚 ============ */

.foot{
  border-top:1px solid var(--line);
  padding:clamp(42px,5.6vw,64px) 0 28px;
  background:var(--bg);
}
.foot-top{
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,2fr);
  gap:clamp(30px,5vw,64px);
  padding-bottom:38px;
}
.foot-brand p{
  margin-top:16px;
  font-size:13.5px;line-height:1.72;color:var(--muted);
  max-width:32ch;
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.foot-cols h4{
  font-size:11.5px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  color:var(--ink);margin-bottom:14px;
}
.foot-cols a{
  display:block;
  font-size:13.6px;color:var(--muted);text-decoration:none;
  padding:4px 0;
  transition:color .18s var(--ease);
}
.foot-cols a:hover{color:var(--ink)}

.foot-bottom{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;
  padding-top:22px;
  border-top:1px solid var(--line);
  font-size:12.5px;color:var(--muted);
}
.foot-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:#969CA8}

/* ============ 滚动揭示 ============ */

.d1{--d:.02s}
.d2{--d:.06s}
.d3{--d:.10s}
.d4{--d:.14s}
.d5{--d:.18s}

html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:
    opacity .7s var(--ease) var(--d,0s),
    transform .7s var(--ease) var(--d,0s);
  will-change:opacity,transform;
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ============ 响应式 ============ */

@media (max-width:1100px){
  .diff{--c1:168px;--c2:200px}
  .diff-r p{font-size:14px}
}

@media (max-width:1040px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .hero-copy{max-width:640px}
  .hero-visual{max-width:640px}
  .limits-grid{grid-template-columns:1fr;gap:8px}
  .limits-grid .sec-sub{margin-bottom:26px}
  .specs{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-top{grid-template-columns:1fr;gap:34px}
}

@media (max-width:900px){
  .diff{--c1:auto;--c2:auto}
  .diff::after{display:none}
  .diff-h{display:none}
  .diff-r{
    display:block;
    padding:18px 0;
  }
  .diff-r p{font-size:14.2px}
  .diff-r .c1{padding:0;font-size:15.5px;font-weight:650}
  .diff-r .c2{padding:7px 0 0;color:var(--muted);font-size:13.4px}
  .diff-r .c3{
    padding:10px 0 0 14px;
    margin-top:10px;
    border-left:2px solid rgba(36,55,214,.3);
    color:var(--ink-2);
    font-size:14px;
  }
  .diff .lbl{
    display:block;
    font-family:var(--font-mono);
    font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;
    color:#A3A9B4;
    margin-bottom:3px;
  }
  .diff-r .c3 .lbl{color:var(--accent)}
  .pillars{grid-template-columns:1fr}
  .lic{grid-template-columns:1fr;max-width:560px}
  .hw{grid-template-columns:1fr;gap:20px}
  .hw-chips{flex-direction:row;flex-wrap:wrap;align-items:flex-start}
}

@media (max-width:860px){
  .nav-links{
    position:absolute;
    top:var(--nav-h);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(247,247,244,.98);
    -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
    border-bottom:1px solid var(--line);
    padding:6px 20px 14px;
    display:none;
    box-shadow:0 20px 40px -30px rgba(17,19,24,.5);
  }
  .nav.is-open .nav-links{display:flex}
  .nav-links a{
    padding:13px 4px;
    font-size:15.5px;
    border-bottom:1px solid var(--line);
  }
  .nav-links a:last-child{border-bottom:0}
  .nav-links a::after{display:none}
  .nav-links a[aria-current="true"]{color:var(--accent)}
  .menu-btn{display:flex}
  .stats-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 0}
  .stats-grid > div:nth-child(3){padding-left:0;border-left:0}
}

@media (max-width:720px){
  .chip-b{right:-4px;top:-26px}
  .themes{grid-template-columns:1fr;gap:14px}
  .specs{grid-template-columns:1fr}
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 20px}
  .brand-tag{display:none}
}

@media (max-width:560px){
  .hero-meta{flex-direction:column;align-items:flex-start;gap:5px;font-size:11px}
  .hero-meta li + li::before{display:none}
  .cta-row .btn{flex:1 1 100%}
  .pillar{padding:24px 20px 26px}
  .stats-grid b{font-size:20px}
}

/* ============ 减少动效 ============ */

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
}