/* ==========================================================================
   Highway-Guard · 高速ETC逃费稽核大模型
   深色科技风 · 单页滚动 · 移动端 / 微信内置浏览器适配
   ========================================================================== */

:root{
  --bg:#060b16;
  --bg-2:#080e1c;
  --bg-3:#0b1424;
  --panel:rgba(255,255,255,.035);
  --panel-2:rgba(255,255,255,.055);
  --line:rgba(122,168,232,.14);
  --line-2:rgba(122,168,232,.26);
  --txt:#e9f1fc;
  --txt-2:#a9bedb;
  --txt-3:#7389a8;
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --indigo:#6366f1;
  --green:#34d399;
  --amber:#fbbf24;
  --red:#f87171;
  --purple:#a78bfa;
  --radius:16px;
  --radius-lg:22px;
  --maxw:1200px;
  --nav-h:66px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

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

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--nav-h) + 12px);
}

body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--txt);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  -webkit-tap-highlight-color:transparent;
  overflow-x:hidden;
  letter-spacing:.01em;
}

img,svg{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;font-weight:700;letter-spacing:-.01em}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
code{font-family:var(--mono);font-size:.92em}

::selection{background:rgba(34,211,238,.28);color:#fff}

/* 背景装饰便于统一收敛，避免横向溢出 */
body::before{
  content:"";
  position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(900px 520px at 12% -6%, rgba(34,211,238,.10), transparent 62%),
    radial-gradient(900px 620px at 92% 8%, rgba(59,130,246,.12), transparent 60%),
    radial-gradient(1000px 700px at 50% 108%, rgba(99,102,241,.09), transparent 65%),
    var(--bg);
}
body::after{
  content:"";
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(122,168,232,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(122,168,232,.035) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%, #000 0%, transparent 78%);
}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ---------- 滚动进度 ---------- */
.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;background:transparent}
.scroll-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--blue),var(--indigo));box-shadow:0 0 14px rgba(34,211,238,.7);transition:width .12s linear}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);
  padding-top:env(safe-area-inset-top,0px);
  background:rgba(6,11,22,.72);
  backdrop-filter:blur(16px) saturate(160%);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid transparent;
  transition:background .3s var(--ease),border-color .3s var(--ease),height .3s var(--ease);
}
.nav.scrolled{background:rgba(6,11,22,.92);border-bottom-color:var(--line)}
.nav-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 22px;height:100%;
  display:flex;align-items:center;gap:18px;
}
.brand{display:flex;align-items:center;gap:11px;min-width:0;flex-shrink:0}
.brand-mark{width:36px;height:36px;flex-shrink:0;color:var(--cyan);display:grid;place-items:center}
.brand-mark svg{width:100%;height:100%}
.brand-mark.small{width:30px;height:30px;color:var(--cyan)}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-text b{font-size:15.5px;letter-spacing:.02em;white-space:nowrap}
.brand-text small{font-size:11px;color:var(--txt-3);white-space:nowrap;letter-spacing:.04em}

.nav-links{display:flex;gap:4px;margin-left:auto;flex-wrap:nowrap}
.nav-links a{
  font-size:14px;color:var(--txt-2);padding:9px 11px;border-radius:9px;
  white-space:nowrap;transition:color .2s,background .2s;
}
.nav-links a:hover{color:var(--txt);background:var(--panel-2)}
.nav-links a.active{color:var(--cyan);background:rgba(34,211,238,.09)}
.nav-cta{
  flex-shrink:0;font-size:13.5px;font-weight:600;padding:9px 18px;border-radius:999px;
  color:#04121c;background:linear-gradient(120deg,var(--cyan),#5eead4);
  box-shadow:0 6px 22px rgba(34,211,238,.28);
  transition:transform .2s var(--ease),box-shadow .2s var(--ease);
  white-space:nowrap;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 10px 28px rgba(34,211,238,.4)}

.burger{display:none;width:42px;height:42px;border:0;background:transparent;cursor:pointer;padding:0;margin-left:auto;position:relative}
.burger span{display:block;width:20px;height:2px;margin:4px auto;border-radius:2px;background:var(--txt);transition:transform .28s var(--ease),opacity .2s}
.burger.open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 通用 section ---------- */
.sec{position:relative;padding:96px 0;overflow:hidden}
.sec-alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.016) 12%,rgba(255,255,255,.016) 88%,transparent)}
.sec-head{max-width:860px;margin-bottom:52px}
.kicker{
  display:inline-block;font-family:var(--mono);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:14px;
  padding:5px 12px;border:1px solid rgba(34,211,238,.28);border-radius:999px;
  background:rgba(34,211,238,.06);
}
.sec-head h2{font-size:clamp(24px,3.4vw,38px);display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.sec-head h2 .idx{
  font-style:normal;font-family:var(--mono);font-size:.62em;color:var(--txt-3);
  border-right:1px solid var(--line-2);padding-right:14px;font-weight:600;
}
.sec-head p{margin-top:16px;color:var(--txt-2);font-size:15.5px;max-width:800px}
.h3-sub{font-size:clamp(19px,2.4vw,27px);margin-top:2px}
.sub-h{font-size:18px;margin:56px 0 22px;color:var(--txt);display:flex;align-items:center;gap:10px}
.sub-h::before{content:"";width:4px;height:18px;border-radius:3px;background:linear-gradient(var(--cyan),var(--blue))}
.mt{margin-top:26px}
.mt-lg{margin-top:22px}
.mt-xl{margin-top:78px}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.07s}
.reveal[data-delay="2"]{transition-delay:.14s}
.reveal[data-delay="3"]{transition-delay:.21s}
.reveal[data-delay="4"]{transition-delay:.28s}
.reveal[data-delay="5"]{transition-delay:.35s}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{position:relative;padding:calc(var(--nav-h) + 74px) 0 88px;overflow:hidden;min-height:min(100vh,900px);display:flex;align-items:center}
.hero-bg{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.grid-lines{
  position:absolute;inset:-10%;
  background-image:linear-gradient(rgba(34,211,238,.07) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(34,211,238,.07) 1px,transparent 1px);
  background-size:88px 88px;
  transform:perspective(560px) rotateX(58deg) translateY(-6%);
  transform-origin:50% 0;
  mask-image:linear-gradient(180deg,#000,transparent 72%);
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 72%);
  animation:gridmove 22s linear infinite;
}
@keyframes gridmove{to{background-position:0 88px,88px 0}}
.radar{
  position:absolute;border-radius:50%;border:1px solid rgba(34,211,238,.16);
  left:var(--rx,-16%);top:var(--ry,26%);width:var(--rs,540px);height:var(--rs,540px);
  background:radial-gradient(circle,rgba(34,211,238,.07),transparent 66%);
}
.radar::after{content:"";position:absolute;inset:22%;border-radius:50%;border:1px solid rgba(59,130,246,.14)}
.radar.r1{--rx:-18%;--ry:18%;--rs:560px;animation:pulse 7s ease-in-out infinite}
.radar.r2{--rx:auto;right:-14%;--ry:44%;--rs:420px;animation:pulse 9s ease-in-out infinite .8s}
@keyframes pulse{0%,100%{opacity:.55;transform:scale(1)}50%{opacity:1;transform:scale(1.06)}}
.road{position:absolute;right:-6%;bottom:-4%;width:min(78%,980px);opacity:.6}
.road-line{fill:none;stroke:rgba(34,211,238,.2);stroke-width:1.6}
.road-line.d2{stroke:rgba(59,130,246,.16)}
.road-dash{fill:none;stroke:url(#none);stroke:var(--cyan);stroke-width:2;stroke-dasharray:16 20;opacity:.5;animation:dash 3.6s linear infinite}
@keyframes dash{to{stroke-dashoffset:-72}}

.hero-inner{position:relative;z-index:2}
.hero-tag{
  display:inline-flex;align-items:center;gap:9px;font-size:13px;color:var(--txt-2);
  padding:7px 15px;border-radius:999px;border:1px solid var(--line-2);
  background:rgba(255,255,255,.035);letter-spacing:.03em;
}
.hero-tag .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:blink 2.2s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.35}}

.hero-title{
  margin:26px 0 0;font-size:clamp(30px,5.6vw,62px);line-height:1.1;letter-spacing:-.02em;
  background:linear-gradient(120deg,#ffffff 12%,#a5e8f7 46%,#7fb3ff 82%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-title em{
  display:block;font-style:normal;font-family:var(--mono);font-size:.5em;
  letter-spacing:.06em;margin-top:14px;
  background:linear-gradient(90deg,var(--cyan),var(--blue));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{margin-top:24px;max-width:700px;font-size:17px;color:var(--txt-2)}
.hero-sub strong{color:var(--txt);font-weight:600}
.hero-actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;font-size:15px;font-weight:600;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),background .22s,color .22s;
  min-height:47px;cursor:pointer;border:1px solid transparent;
}
.btn-primary{color:#04121c;background:linear-gradient(120deg,var(--cyan),#60a5fa);box-shadow:0 10px 32px rgba(34,211,238,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px rgba(34,211,238,.42)}
.btn-ghost{color:var(--txt);border-color:var(--line-2);background:rgba(255,255,255,.04)}
.btn-ghost:hover{background:rgba(255,255,255,.09);transform:translateY(-2px)}

.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:58px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;
}
.hs{padding:22px 20px;background:rgba(9,15,28,.72);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.hs b{display:block;font-size:clamp(22px,2.9vw,32px);font-weight:800;letter-spacing:-.02em;
  background:linear-gradient(120deg,#fff,#7dd3fc);-webkit-background-clip:text;background-clip:text;color:transparent}
.hs span{display:block;margin-top:6px;font-size:12.5px;color:var(--txt-3);line-height:1.5}
.hero-meta{display:flex;align-items:center;gap:14px;margin-top:34px;font-size:13px;color:var(--txt-3);flex-wrap:wrap}
.hero-meta i{width:1px;height:12px;background:var(--line-2)}
.scroll-hint{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:24px;height:38px;border:1.5px solid var(--line-2);border-radius:14px;display:grid;place-items:start center;padding-top:7px}
.scroll-hint span{width:4px;height:8px;border-radius:2px;background:var(--cyan);animation:scrolldot 1.9s ease-in-out infinite}
@keyframes scrolldot{0%{transform:translateY(0);opacity:1}70%{transform:translateY(13px);opacity:0}100%{opacity:0}}

/* ==========================================================================
   TOC
   ========================================================================== */
.sec-toc{padding-top:78px}
.toc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.toc-card{
  position:relative;padding:26px 24px 28px;border-radius:var(--radius);
  border:1px solid var(--line);background:linear-gradient(160deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  transition:transform .28s var(--ease),border-color .28s,background .28s;
  overflow:hidden;
}
.toc-card::after{
  content:"";position:absolute;right:-30px;top:-30px;width:120px;height:120px;border-radius:50%;
  background:radial-gradient(circle,rgba(34,211,238,.16),transparent 70%);
  opacity:0;transition:opacity .35s;
}
.toc-card:hover{transform:translateY(-4px);border-color:var(--line-2);background:linear-gradient(160deg,rgba(34,211,238,.09),rgba(255,255,255,.02))}
.toc-card:hover::after{opacity:1}
.toc-card i{font-style:normal;font-family:var(--mono);font-size:13px;color:var(--cyan);letter-spacing:.12em}
.toc-card b{display:block;margin-top:11px;font-size:17.5px}
.toc-card span{display:block;margin-top:8px;font-size:13.5px;color:var(--txt-3);line-height:1.65}

/* ==========================================================================
   01 痛点
   ========================================================================== */
.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.pain-card{
  padding:26px 22px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  position:relative;overflow:hidden;transition:transform .28s var(--ease),border-color .28s;
}
.pain-card:hover{transform:translateY(-4px);border-color:var(--line-2)}
.pain-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--tone,var(--cyan));opacity:.7}
.pc-icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;margin-bottom:16px;border:1px solid currentColor}
.pc-icon svg{width:23px;height:23px}
.tone-red{color:var(--red);background:rgba(248,113,113,.09)}
.tone-amber{color:var(--amber);background:rgba(251,191,36,.09)}
.tone-blue{color:var(--blue);background:rgba(59,130,246,.09)}
.tone-purple{color:var(--purple);background:rgba(167,139,250,.09)}
.pain-card:nth-child(1){--tone:var(--red)}
.pain-card:nth-child(2){--tone:var(--amber)}
.pain-card:nth-child(3){--tone:var(--blue)}
.pain-card:nth-child(4){--tone:var(--purple)}
.pain-card h3{font-size:17.5px}
.pc-sub{margin-top:6px;font-size:12.5px;color:var(--txt-3);letter-spacing:.04em}
.pain-card ul{margin-top:16px;display:grid;gap:9px}
.pain-card li{position:relative;padding-left:16px;font-size:13.5px;color:var(--txt-2)}
.pain-card li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:var(--tone,var(--cyan));opacity:.85}

.callout{
  margin-top:34px;padding:24px 26px;border-radius:var(--radius);
  border:1px solid var(--line-2);background:linear-gradient(100deg,rgba(34,211,238,.09),rgba(59,130,246,.05));
  display:flex;gap:20px;align-items:flex-start;flex-wrap:wrap;
}
.co-label{flex-shrink:0;font-size:12.5px;font-weight:700;letter-spacing:.08em;color:var(--cyan);border:1px solid rgba(34,211,238,.3);padding:5px 12px;border-radius:999px;background:rgba(34,211,238,.08)}
.callout p{flex:1;min-width:260px;font-size:15px;color:var(--txt-2)}
.callout strong{color:var(--txt)}

/* ==========================================================================
   02 架构
   ========================================================================== */
.arch{display:flex;flex-direction:column}
.arch-layer{
  display:grid;grid-template-columns:280px 1fr;gap:26px;align-items:center;
  padding:24px 26px;border-radius:var(--radius);
  border:1px solid var(--line);
  background:linear-gradient(100deg,rgba(255,255,255,.05),rgba(255,255,255,.014));
  transition:border-color .3s,transform .3s var(--ease),background .3s;
}
.arch-layer:hover{border-color:var(--line-2);transform:translateX(4px)}
.al-side h3{font-size:17.5px}
.al-side h3 code{color:var(--cyan);font-size:.9em}
.al-side p{margin-top:7px;font-size:13.5px;color:var(--txt-3)}
.al-no{
  display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  color:var(--cyan);border:1px solid rgba(34,211,238,.3);border-radius:6px;
  padding:2px 8px;margin-bottom:10px;background:rgba(34,211,238,.07);
}
.al-chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{
  font-size:13.5px;padding:8px 16px;border-radius:999px;
  border:1px solid var(--line-2);background:rgba(255,255,255,.045);color:var(--txt-2);
  transition:color .2s,border-color .2s,background .2s;
}
.chip-hi{color:#bff3ff;border-color:rgba(34,211,238,.4);background:rgba(34,211,238,.12)}
.arch-engine{
  border-color:rgba(34,211,238,.34);
  background:linear-gradient(100deg,rgba(34,211,238,.13),rgba(59,130,246,.07));
  box-shadow:0 18px 50px -22px rgba(34,211,238,.5);
  grid-template-columns:280px 1fr;
}
.arch-engine .al-chips{align-self:center}
.al-flow{
  grid-column:1/-1;display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  margin-top:16px;padding-top:16px;border-top:1px dashed rgba(34,211,238,.28);
  font-family:var(--mono);font-size:13px;color:#a5e8f7;letter-spacing:.04em;
}
.al-flow i{color:var(--cyan);font-style:normal}
.arch-arrow{height:26px;width:2px;margin:0 auto;background:linear-gradient(var(--line-2),rgba(34,211,238,.5));position:relative}
.arch-arrow::after{content:"";position:absolute;bottom:-1px;left:50%;transform:translateX(-50%);border:5px solid transparent;border-top-color:rgba(34,211,238,.6)}

/* ==========================================================================
   03-1 数据底座
   ========================================================================== */
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.dcard{
  padding:24px 22px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.05),rgba(255,255,255,.012));
  display:flex;flex-direction:column;transition:transform .28s var(--ease),border-color .28s;
}
.dcard:hover{transform:translateY(-4px);border-color:var(--line-2)}
.dc-top{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.dc-top h3{font-size:17px}
.tag{font-size:11.5px;color:var(--cyan);border:1px solid rgba(34,211,238,.26);background:rgba(34,211,238,.08);padding:3px 9px;border-radius:6px;white-space:nowrap}
.dcard ul{margin-top:16px;display:grid;gap:9px;flex:1}
.dcard li{position:relative;padding-left:15px;font-size:13.5px;color:var(--txt-2)}
.dcard li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:var(--cyan);opacity:.8}
.dcard code{color:#a5e8f7;background:rgba(34,211,238,.1);padding:1px 5px;border-radius:4px}
.dc-foot{margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--txt-3);letter-spacing:.05em;word-break:break-all}

.gov-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:20px}
.gov{padding:20px 22px;border-radius:var(--radius);border:1px dashed var(--line-2);background:rgba(255,255,255,.022)}
.gov b{display:block;font-size:15px;color:#a5e8f7}
.gov span{display:block;margin-top:8px;font-size:13.5px;color:var(--txt-3)}

/* ==========================================================================
   03-2 费率
   ========================================================================== */
.two-col{display:grid;grid-template-columns:1fr 1.15fr;gap:20px;align-items:start}
.panel{
  padding:26px 24px;border-radius:var(--radius-lg);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
}
.ph{font-size:16.5px;margin-bottom:18px;display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}
.ph small{font-size:12.5px;color:var(--txt-3);font-weight:400}
.vclass{display:grid;gap:10px}
.vc{
  display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;
  padding:14px 16px;border-radius:11px;border:1px solid var(--line);background:rgba(255,255,255,.03);
}
.vc-k{font-size:14px;color:var(--txt-2);font-weight:600;flex-shrink:0}
.vc-v{font-family:var(--mono);font-size:13.5px;color:#a5e8f7;letter-spacing:.06em}
.zrow{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.zitem{padding:16px;border-radius:11px;border:1px solid;text-align:center}
.zitem b{display:block;font-size:14.5px}
.zitem span{display:block;margin-top:4px;font-size:12.5px;opacity:.8}
.z-abn{border-color:rgba(248,113,113,.34);background:rgba(248,113,113,.08);color:#fca5a5}
.z-ok{border-color:rgba(52,211,153,.32);background:rgba(52,211,153,.07);color:#6ee7b7}

.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.tbl{width:100%;border-collapse:collapse;font-size:13.5px;min-width:460px}
.tbl th{
  text-align:left;padding:11px 13px;font-size:12px;letter-spacing:.06em;color:var(--txt-3);
  font-weight:600;border-bottom:1px solid var(--line-2);white-space:nowrap;
}
.tbl td{padding:13px;border-bottom:1px solid var(--line);color:var(--txt-2);vertical-align:top}
.tbl tr:last-child td{border-bottom:0}
.tbl tbody tr{transition:background .2s}
.tbl tbody tr:hover{background:rgba(255,255,255,.025)}
.pill{display:inline-block;font-size:12px;padding:3px 10px;border-radius:999px;white-space:nowrap;border:1px solid}
.pill-red{color:#fca5a5;border-color:rgba(248,113,113,.34);background:rgba(248,113,113,.09)}
.pill-green{color:#6ee7b7;border-color:rgba(52,211,153,.32);background:rgba(52,211,153,.08)}
.pill-amber{color:#fcd34d;border-color:rgba(251,191,36,.32);background:rgba(251,191,36,.08)}
.pill-blue{color:#93c5fd;border-color:rgba(59,130,246,.34);background:rgba(59,130,246,.09)}

.chart{
  position:relative;height:250px;display:flex;align-items:flex-end;gap:min(4%,26px);
  padding:34px 8px 0;border-bottom:1px solid var(--line-2);
}
.bar{flex:1;position:relative;display:flex;flex-direction:column;justify-content:flex-end;height:100%;min-width:0}
.bar i{
  display:block;width:100%;height:0;border-radius:8px 8px 0 0;
  background:linear-gradient(180deg,var(--cyan),rgba(59,130,246,.55));
  transition:height 1s var(--ease);position:relative;
}
.chart.go .bar i{height:var(--h)}
.bar i::after{content:"";position:absolute;inset:0;border-radius:8px 8px 0 0;background:linear-gradient(180deg,rgba(255,255,255,.35),transparent 55%);opacity:.5}
.bar .bv{position:absolute;top:-24px;left:0;right:0;text-align:center;font-family:var(--mono);font-size:12.5px;color:var(--txt-2);opacity:0;transition:opacity .5s .5s}
.chart.go .bar .bv{opacity:1}
.bar em{
  position:absolute;bottom:-34px;left:-6px;right:-6px;text-align:center;font-style:normal;
  font-size:12px;color:var(--txt-3);white-space:nowrap;transform:rotate(0);
}
.grid-y{position:absolute;inset:34px 0 0;display:flex;flex-direction:column;justify-content:space-between;pointer-events:none;z-index:-1}
.grid-y span{font-size:11px;color:rgba(140,162,192,.55);border-top:1px dashed rgba(122,168,232,.1);padding-top:2px}
.note{margin-top:48px;font-size:12.5px;color:var(--txt-3)}
.note code{color:#a5e8f7}

/* ==========================================================================
   03-3 轨迹
   ========================================================================== */
.track-wrap{display:grid;grid-template-columns:1fr 1.25fr;gap:20px;align-items:stretch}
.donut-wrap{display:flex;align-items:center;gap:26px;flex-wrap:wrap}
.donut{width:172px;height:172px;flex-shrink:0;transform:rotate(-90deg)}
.donut circle{transition:stroke-dasharray 1.2s var(--ease)}
.donut-legend{display:grid;gap:14px}
.lg{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--txt-2)}
.lg i{width:11px;height:11px;border-radius:3px;flex-shrink:0;display:block}
.lg b{font-family:var(--mono);font-size:17px;color:var(--txt);min-width:46px}
.lg span{font-size:13px;color:var(--txt-3)}

.route{width:100%;height:auto}
.rt-line{fill:none;stroke:rgba(122,168,232,.24);stroke-width:2}
.rt-flow{fill:none;stroke:url(#rg);stroke-width:2.4;stroke-dasharray:10 14;animation:dash 3s linear infinite}
.rt-node circle{fill:#0b1424;stroke-width:2}
.rt-node.real circle{stroke:var(--cyan)}
.rt-node.guess circle{stroke:var(--blue);stroke-dasharray:3 3;fill:rgba(59,130,246,.16)}
.rt-node text{fill:var(--txt-3);font-size:11px;text-anchor:middle;font-family:var(--font)}
.rt-legend{display:flex;gap:20px;margin-top:16px;flex-wrap:wrap;font-size:12.5px;color:var(--txt-3)}
.rt-legend span{display:inline-flex;align-items:center;gap:8px}
.d-solid{width:12px;height:3px;background:var(--cyan);border-radius:2px;display:inline-block}
.d-hollow{width:12px;height:3px;background:repeating-linear-gradient(90deg,var(--blue) 0 3px,transparent 3px 6px);display:inline-block}

.bigstat{
  margin-top:22px;padding:30px 32px;border-radius:var(--radius-lg);
  border:1px solid rgba(34,211,238,.28);
  background:linear-gradient(100deg,rgba(34,211,238,.12),rgba(99,102,241,.06));
  display:flex;align-items:center;gap:30px;flex-wrap:wrap;
}
.bigstat > b{
  font-size:clamp(34px,5.4vw,58px);font-weight:800;letter-spacing:-.03em;line-height:1;
  background:linear-gradient(120deg,#ffffff,#67e8f9 60%,#60a5fa);
  -webkit-background-clip:text;background-clip:text;color:transparent;flex-shrink:0;
}
.bigstat strong{display:block;font-size:16px;color:var(--txt)}
.bigstat p{margin-top:8px;font-size:13.5px;color:var(--txt-2)}
.bigstat em{font-style:normal;color:#fca5a5;font-weight:600}

/* ==========================================================================
   03-4 判定
   ========================================================================== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative}
.step{
  position:relative;padding:26px 22px;border-radius:var(--radius);
  border:1px solid var(--line);background:linear-gradient(170deg,rgba(255,255,255,.05),rgba(255,255,255,.012));
  transition:transform .28s var(--ease),border-color .28s;
}
.step:hover{transform:translateY(-4px);border-color:var(--line-2)}
.step::after{
  content:"";position:absolute;right:-13px;top:50%;width:11px;height:11px;
  border-top:1.5px solid rgba(34,211,238,.45);border-right:1.5px solid rgba(34,211,238,.45);
  transform:translateY(-50%) rotate(45deg);z-index:3;
}
.step:last-child::after{display:none}
.st-no{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;color:var(--cyan)}
.step h3{margin-top:12px;font-size:17px}
.step p{margin-top:9px;font-size:13.5px;color:var(--txt-3)}
.step code{color:#a5e8f7;font-size:12px;background:rgba(34,211,238,.1);padding:1px 5px;border-radius:4px}

.formula{
  margin-top:36px;padding:30px;border-radius:var(--radius-lg);
  border:1px solid var(--line);background:rgba(255,255,255,.022);
  display:grid;gap:16px;
}
.f-label{font-size:12px;letter-spacing:.1em;color:var(--cyan);font-family:var(--mono);text-transform:uppercase}
.f-body{display:grid;gap:10px}
.f-body code{
  display:block;padding:13px 16px;border-radius:10px;background:rgba(6,11,22,.72);
  border:1px solid var(--line);color:#cbd5e1;font-size:13.5px;overflow-x:auto;white-space:nowrap;
}
.f-body code.f-hi{color:#a5e8f7;border-color:rgba(34,211,238,.34);background:rgba(34,211,238,.08)}
.f-parts{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.fp{font-size:13.5px;padding:9px 16px;border-radius:9px;border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--txt-2)}
.fp-res{border-color:rgba(34,211,238,.4);background:rgba(34,211,238,.1);color:#bff3ff;font-weight:600}
.f-parts i{color:var(--cyan);font-style:normal;font-size:16px}

/* ==========================================================================
   04 成效
   ========================================================================== */
.kpi-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.kpi{
  padding:30px 24px;border-radius:var(--radius-lg);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.055),rgba(255,255,255,.012));
  position:relative;overflow:hidden;transition:transform .28s var(--ease),border-color .28s;
}
.kpi:hover{transform:translateY(-4px);border-color:var(--line-2)}
.kpi::after{content:"";position:absolute;right:-40px;bottom:-40px;width:130px;height:130px;border-radius:50%;background:radial-gradient(circle,rgba(34,211,238,.14),transparent 70%)}
.kpi b{
  display:block;font-size:clamp(28px,4.2vw,46px);font-weight:800;letter-spacing:-.03em;line-height:1.05;
  background:linear-gradient(120deg,#ffffff,#7dd3fc);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.kpi b s{text-decoration:none;font-size:.5em;color:var(--cyan);-webkit-text-fill-color:var(--cyan);margin-left:4px;font-weight:700}
.k-u{display:block;margin-top:8px;font-family:var(--mono);font-size:12.5px;color:var(--cyan);letter-spacing:.08em;min-height:19px}
.kpi em{display:block;font-style:normal;margin-top:10px;padding-top:12px;border-top:1px solid var(--line);font-size:13.5px;color:var(--txt-3)}
.kpi-sm b{font-size:clamp(24px,3.4vw,36px)}

.annual{
  margin-top:22px;display:grid;grid-template-columns:1fr 1.35fr;gap:26px;align-items:center;
  padding:34px;border-radius:var(--radius-lg);border:1px solid rgba(34,211,238,.26);
  background:linear-gradient(100deg,rgba(34,211,238,.1),rgba(59,130,246,.05));
}
.an-kicker{display:inline-block;font-size:12px;letter-spacing:.1em;color:var(--cyan);font-family:var(--mono);margin-bottom:12px}
.an-left b{display:block;font-size:clamp(38px,6vw,64px);font-weight:800;letter-spacing:-.04em;line-height:1;
  background:linear-gradient(120deg,#fff,#67e8f9);-webkit-background-clip:text;background-clip:text;color:transparent}
.an-left b small{font-size:.34em;font-weight:700;margin-left:8px;letter-spacing:0}
.an-left p{margin-top:12px;font-size:13.5px;color:var(--txt-3)}
.an-right{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.an-item{padding:18px 16px;border-radius:13px;border:1px solid var(--line);background:rgba(6,11,22,.5)}
.an-item b{display:block;font-size:clamp(20px,2.6vw,28px);font-weight:800;color:#a5e8f7;letter-spacing:-.02em}
.an-item b span{font-size:.56em;font-weight:600;margin-left:2px;color:var(--txt-2)}
.an-item span{display:block;margin-top:8px;font-size:12.5px;color:var(--txt-3);line-height:1.5}

.risk{
  margin-top:22px;display:flex;gap:16px;align-items:flex-start;padding:20px 24px;
  border-radius:var(--radius);border:1px dashed rgba(251,191,36,.32);background:rgba(251,191,36,.05);
}
.risk svg{width:22px;height:22px;flex-shrink:0;color:var(--amber);margin-top:3px}
.risk p{font-size:13.5px;color:#e8d9b0}
.risk strong{color:var(--amber)}
.risk b{color:#fff}

/* ==========================================================================
   05 引擎
   ========================================================================== */
.bg-glow{
  position:absolute;left:50%;top:8%;transform:translateX(-50%);
  width:min(920px,110vw);height:520px;pointer-events:none;
  background:radial-gradient(ellipse at center,rgba(34,211,238,.13),transparent 68%);
}
.bg-glow.g2{top:auto;bottom:-6%}
.engine-top{display:grid;grid-template-columns:1fr 1.3fr;gap:20px;align-items:stretch;position:relative}
.mc-kicker{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.2em;color:var(--cyan);margin-bottom:16px}
.model-card{
  padding:30px 26px;border-radius:var(--radius-lg);border:1px solid rgba(34,211,238,.32);
  background:linear-gradient(165deg,rgba(34,211,238,.13),rgba(59,130,246,.05));
  display:flex;flex-direction:column;box-shadow:0 24px 60px -30px rgba(34,211,238,.6);
}
.model-card h3{font-family:var(--mono);font-size:clamp(22px,2.8vw,30px);letter-spacing:-.01em;color:#fff}
.model-card ul{margin-top:22px;display:grid;gap:13px;flex:1}
.model-card li{display:flex;align-items:flex-start;gap:11px;font-size:14.5px;color:var(--txt-2)}
.model-card li i{width:16px;height:16px;border-radius:50%;flex-shrink:0;margin-top:5px;background:rgba(34,211,238,.16);border:1px solid rgba(34,211,238,.45);position:relative}
.model-card li i::after{content:"";position:absolute;left:4.6px;top:2.4px;width:4px;height:7px;border-right:1.6px solid var(--cyan);border-bottom:1.6px solid var(--cyan);transform:rotate(42deg)}
.mc-badge{margin-top:22px;padding-top:16px;border-top:1px solid rgba(34,211,238,.22);font-size:12px;font-family:var(--mono);color:#a5e8f7;letter-spacing:.04em}
.stack{
  padding:30px 26px;border-radius:var(--radius-lg);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.05),rgba(255,255,255,.012));
  display:grid;gap:14px;align-content:start;
}
.stack-item{padding:16px 18px;border-radius:12px;border:1px solid var(--line);background:rgba(6,11,22,.45);transition:border-color .25s,transform .25s var(--ease)}
.stack-item:hover{border-color:var(--line-2);transform:translateX(4px)}
.stack-item b{font-size:15.5px;color:#a5e8f7;font-family:var(--mono)}
.stack-item p{margin-top:7px;font-size:13.5px;color:var(--txt-3)}

.cap-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cap{
  position:relative;padding:24px 22px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  transition:transform .28s var(--ease),border-color .28s;
}
.cap:hover{transform:translateY(-4px);border-color:var(--line-2)}
.cl-no{
  display:grid;place-items:center;width:28px;height:28px;border-radius:9px;
  font-family:var(--mono);font-size:13px;color:#04121c;font-weight:700;
  background:linear-gradient(120deg,var(--cyan),#60a5fa);margin-bottom:14px;
}
.cap h4{font-size:16px}
.cap p{margin-top:9px;font-size:13.5px;color:var(--txt-3)}

.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px}
.why{padding:26px 24px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(170deg,rgba(255,255,255,.045),rgba(255,255,255,.012));transition:transform .28s var(--ease),border-color .28s}
.why:hover{transform:translateY(-4px);border-color:var(--line-2)}
.w-icon{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;color:var(--cyan);background:rgba(34,211,238,.09);border:1px solid rgba(34,211,238,.28);margin-bottom:16px}
.w-icon svg{width:22px;height:22px}
.why h4{font-size:16.5px}
.why p{margin-top:9px;font-size:13.5px;color:var(--txt-3)}

.quote{
  margin:36px 0 0;padding:28px 30px 28px 34px;border-radius:var(--radius-lg);
  border:1px solid var(--line);border-left:3px solid var(--cyan);
  background:linear-gradient(100deg,rgba(34,211,238,.075),rgba(255,255,255,.015));
  font-size:16px;color:var(--txt-2);line-height:1.8;
}
.quote em{font-style:normal;color:#a5e8f7;font-weight:600}

/* ==========================================================================
   06 路线图
   ========================================================================== */
.tl{position:relative;padding-left:0}
.tl-items{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative}
.tl-axis{position:absolute;left:0;right:0;top:15px;height:2px;background:linear-gradient(90deg,rgba(34,211,238,.55),rgba(99,102,241,.3));border-radius:2px}
.tl-item{position:relative;padding-top:46px}
.tl-item::before{
  content:"";position:absolute;left:6px;top:9px;width:14px;height:14px;border-radius:50%;
  background:var(--bg);border:2px solid var(--cyan);box-shadow:0 0 0 4px rgba(34,211,238,.12);
  z-index:2;
}
.tl-item:last-child::before{border-color:var(--indigo);box-shadow:0 0 0 4px rgba(99,102,241,.14)}
.tl-q{position:absolute;left:0;top:-18px;font-family:var(--mono);font-size:12.5px;color:var(--cyan);letter-spacing:.08em}
.tl-card{
  padding:24px 22px;border-radius:var(--radius);border:1px solid var(--line);
  background:linear-gradient(170deg,rgba(255,255,255,.05),rgba(255,255,255,.012));
  height:100%;transition:transform .28s var(--ease),border-color .28s;
}
.tl-card:hover{transform:translateY(-4px);border-color:var(--line-2)}
.tl-no{font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;color:var(--txt-3)}
.tl-card h3{margin-top:10px;font-size:16.5px}
.tl-card p{margin-top:9px;font-size:13.5px;color:var(--txt-3)}
.tl-metric{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:13.5px;color:var(--txt-2)}
.tl-metric b{color:#a5e8f7;font-family:var(--mono);font-size:15px}

/* ==========================================================================
   CTA
   ========================================================================== */
.cta{padding:104px 0 112px}
.cta-inner{position:relative;text-align:center;max-width:880px;margin:0 auto}
.cta-inner h2{font-size:clamp(26px,4vw,44px);letter-spacing:-.02em;margin-top:6px}
.cta-inner h2 em{font-style:normal;background:linear-gradient(120deg,var(--cyan),#60a5fa);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta-sub{margin-top:18px;font-size:15px;color:var(--txt-3);letter-spacing:.06em}
.cta-pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
.cta-pillars > div{padding:24px 18px;border-radius:var(--radius);border:1px solid var(--line);background:linear-gradient(170deg,rgba(255,255,255,.05),rgba(255,255,255,.012))}
.cta-pillars b{display:block;font-size:17px;color:#a5e8f7}
.cta-pillars span{display:block;margin-top:8px;font-size:13px;color:var(--txt-3)}
.cta-note{margin-top:36px;font-size:14px;color:var(--txt-2);line-height:1.9}
.cta-org{
  margin-top:30px;display:inline-block;padding:12px 30px;border-radius:999px;
  border:1px solid rgba(34,211,238,.3);background:rgba(34,211,238,.08);
  font-size:15px;font-weight:600;letter-spacing:.04em;color:#bff3ff;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.foot{border-top:1px solid var(--line);background:rgba(4,8,16,.6);padding:52px 0 calc(34px + env(safe-area-inset-bottom,0px))}
.foot-inner{display:grid;grid-template-columns:1.1fr 1.4fr 1fr;gap:32px;align-items:start}
.foot-brand{display:flex;align-items:center;gap:13px}
.foot-brand b{font-size:15.5px}
.foot-brand p{margin-top:5px;font-size:12.5px;color:var(--txt-3)}
.foot-links{display:flex;flex-wrap:wrap;gap:6px}
.foot-links a{font-size:13.5px;color:var(--txt-3);padding:9px 13px;border-radius:9px;transition:color .2s,background .2s}
.foot-links a:hover{color:var(--txt);background:var(--panel-2)}
.foot-meta{text-align:right}
.foot-meta p{font-size:12.5px;color:var(--txt-3)}
.foot-warn{margin-top:9px;opacity:.72;line-height:1.7}

/* ---------- 回到顶部 ---------- */
.to-top{
  position:fixed;right:20px;bottom:calc(24px + env(safe-area-inset-bottom,0px));z-index:90;
  width:46px;height:46px;border-radius:14px;border:1px solid var(--line-2);
  background:rgba(9,15,28,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  color:var(--cyan);display:grid;place-items:center;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity .3s,visibility .3s,transform .3s var(--ease),background .2s;
}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:rgba(34,211,238,.14)}
.to-top svg{width:20px;height:20px}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1120px){
  .nav-links{gap:0}
  .nav-links a{padding:9px 8px;font-size:13px}
  .cap-list{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:980px){
  :root{--nav-h:62px}
  .sec{padding:80px 0}
  .toc-grid,.pain-grid,.data-grid,.steps,.tl-items,.cap-list,.why-grid,.kpi-grid,.gov-row{grid-template-columns:repeat(2,1fr)}
  .two-col,.track-wrap,.engine-top,.annual,.foot-inner{grid-template-columns:1fr}
  .foot-meta{text-align:left}
  .arch-layer,.arch-engine{grid-template-columns:1fr;gap:16px}
  .arch-engine .al-flow{grid-column:auto}
  .arch-arrow{height:20px}
  .cta-pillars{grid-template-columns:repeat(3,1fr);gap:14px}
  .step::after{display:none}
  .quote{padding:24px}
}

/* 导航折叠（须早于移动端布局生效，避免 CTA 撑出视口） */
@media (max-width:880px){
  .nav-links{
    position:fixed;top:calc(var(--nav-h) + env(safe-area-inset-top,0px));left:0;right:0;
    flex-direction:column;gap:2px;margin:0;padding:14px 20px calc(20px + env(safe-area-inset-bottom,0px));
    background:rgba(6,11,22,.98);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    max-height:calc(var(--vh,1vh) * 100 - var(--nav-h) - 20px);
    overflow-y:auto;-webkit-overflow-scrolling:touch;
    transform:translateY(-12px);opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s;
  }
  .nav-links.open{transform:none;opacity:1;visibility:visible;pointer-events:auto}
  .nav-links a{font-size:15.5px;padding:13px 12px;border-radius:10px;min-height:46px;display:flex;align-items:center}
  .burger{display:block}
  .nav-cta{display:none}
}

@media (max-width:720px){
  .container{padding:0 18px}
  .sec{padding:68px 0}
  .sec-head{margin-bottom:38px}
  .sec-head p{font-size:14.5px}
  .hero{padding:calc(var(--nav-h) + 46px) 0 70px;min-height:auto}
  .hero-sub{font-size:15.5px}
  .hero-actions .btn{flex:1;min-width:140px}
  .hero-stats{grid-template-columns:1fr 1fr;margin-top:42px}
  .hs{padding:18px 16px}
  .scroll-hint{display:none}
  .road{width:120%;right:-24%;opacity:.32}
  .radar{opacity:.55}

  .toc-grid,.pain-grid,.data-grid,.steps,.tl-items,.cap-list,.why-grid,.kpi-grid,.gov-row,.zrow{grid-template-columns:1fr}
  .cta-pillars{grid-template-columns:1fr}
  .an-right{grid-template-columns:1fr}
  .annual{padding:26px 22px;gap:20px}
  .bigstat{padding:24px 22px;gap:18px}
  .formula{padding:22px 18px}
  .panel{padding:22px 18px}
  .callout{padding:20px;gap:14px}
  .co-label{flex:none}
  .model-card,.stack{padding:24px 20px}
  .chart{height:200px;gap:6px;padding-top:30px}
  .bar em{font-size:11.5px;bottom:-34px;white-space:normal;line-height:1.25}
  .chart{padding-bottom:30px;margin-bottom:24px}
  .donut{width:148px;height:148px}
  .donut-wrap{gap:18px}
  .tl-axis{display:none}
  .tl-item{padding-top:34px;padding-left:22px}
  .tl-item::before{left:0;top:8px}
  .esteps .step::after{display:none}
  .quote{font-size:15px;padding:22px 20px}
  .risk{padding:18px}
  .foot{padding:40px 0 calc(28px + env(safe-area-inset-bottom,0px))}
  .foot-links a{padding:11px 13px}
  .ritem{padding-top:34px}
}

@media (max-width:420px){
  .container{padding:0 15px}
  .brand-text small{display:none}
  .hero-title{font-size:27px}
  .hero-stats{grid-template-columns:1fr}
  .f-body code{font-size:12px}
  .f-parts{gap:9px}
  .fp{font-size:12.5px;padding:8px 12px}
  .to-top{right:14px;width:42px;height:42px}
}

/* 触控设备：取消 hover 位移带来的抖动 */
@media (hover:none){
  .toc-card:hover,.pain-card:hover,.dcard:hover,.step:hover,.kpi:hover,.cap:hover,.why:hover,.tl-card:hover,.arch-layer:hover,.stack-item:hover{transform:none}
}

/* 低动效偏好 */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
}