/* ==========================================================================
   鼎极智能 · 官网主样式（一）
   设计系统 / 基础排版 / 悬浮导航 / 首屏 / 按钮 / 法规滚动条
   参考版式：Tevora —— 白色药丸导航、深海军蓝 + 墨绿 + 柠檬绿、斜切几何块
   ========================================================================== */

:root{
  /* 品牌色 */
  --navy-900:#071223;
  --navy-800:#0B1A31;
  --navy-700:#102440;
  --navy-600:#193456;
  --teal-900:#072A25;
  --teal-800:#0A342D;
  --teal-700:#0E463C;
  --lime:#D8F26B;
  --lime-600:#C6E354;
  --lime-dim:rgba(216,242,107,.16);

  /* 中性色 */
  --paper:#F6F7F3;
  --paper-2:#EDEFE9;
  --white:#FFFFFF;
  --ink:#0D1826;
  --body:#4E5C6E;
  --muted:#8693A2;
  --line:rgba(13,24,38,.10);
  --line-2:rgba(13,24,38,.06);
  --line-dark:rgba(255,255,255,.14);

  /* 字体 */
  --sans:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC",-apple-system,"Segoe UI",Roboto,sans-serif;
  --display:"Microsoft YaHei Light","PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC",-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono","SF Mono",Consolas,"Liberation Mono",monospace;

  /* 圆角 / 阴影 / 节奏 */
  --r-xs:2px;
  --r-sm:4px;
  --r-md:8px;
  --r-lg:16px;
  --r-pill:999px;
  --sh-1:0 2px 8px rgba(7,18,35,.05);
  --sh-2:0 12px 32px rgba(7,18,35,.09);
  --sh-3:0 24px 64px rgba(7,18,35,.16);
  --wrap:1280px;
  --gutter:clamp(20px,4vw,48px);
  --sec:clamp(76px,8.5vw,132px);
  --nav-h:76px;
}

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

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--body);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
svg{display:block}
::selection{background:var(--lime);color:var(--navy-900)}

:focus-visible{outline:2px solid var(--lime-600);outline-offset:3px}

/* ---------- 布局工具 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:var(--sec);position:relative}
.section--paper{background:var(--paper)}
.section--dark{background:var(--navy-800);color:rgba(255,255,255,.74)}
.section--teal{background:var(--teal-800);color:rgba(255,255,255,.72)}
.hr{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 排版 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:11px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--muted);line-height:1;
}
.eyebrow::before{
  content:"";width:22px;height:2px;background:var(--lime-600);flex:none;
}
.section--dark .eyebrow,.section--teal .eyebrow{color:rgba(255,255,255,.55)}
.eyebrow--lime{color:var(--lime)}
.section--dark .eyebrow--lime,.section--teal .eyebrow--lime{color:var(--lime)}

.h2{
  font-family:var(--display);
  font-weight:300;
  font-size:clamp(28px,3.1vw,44px);
  line-height:1.34;
  letter-spacing:.005em;
  color:var(--ink);
  margin-top:20px;
}
.h2 b,.h2 strong{font-weight:700}
.section--dark .h2,.section--teal .h2{color:#fff}

.lead{
  margin-top:22px;
  font-size:clamp(15px,1.15vw,17px);
  line-height:1.95;
  color:var(--body);
  max-width:62ch;
}
.section--dark .lead,.section--teal .lead{color:rgba(255,255,255,.66)}

.sec-head{max-width:820px}
.sec-head--wide{max-width:960px}
.sec-head--split{
  max-width:none;
  display:grid;grid-template-columns:minmax(0,1.16fr) minmax(0,.84fr);
  gap:clamp(24px,5vw,80px);align-items:end;padding-bottom:clamp(36px,4vw,60px);
}

/* ---------- 按钮 ---------- */
.btn{
  --h:50px;
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:var(--h);padding:0 26px;
  border-radius:var(--r-sm);
  font-size:14.5px;font-weight:700;letter-spacing:.02em;
  border:1px solid transparent;
  transition:transform .18s ease,background .22s ease,color .22s ease,border-color .22s ease,box-shadow .22s ease;
  white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn--lime{background:var(--lime);color:var(--navy-900);box-shadow:0 8px 24px rgba(216,242,107,.22)}
.btn--lime:hover{background:#E3F78A;box-shadow:0 12px 30px rgba(216,242,107,.3)}
.btn--ghost{border-color:rgba(255,255,255,.26);color:#fff}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime)}
.btn--dark{background:var(--navy-800);color:#fff}
.btn--dark:hover{background:var(--navy-700)}
.btn--nav{height:42px;padding:0 20px;background:var(--navy-800);color:#fff;font-size:13.5px;border-radius:var(--r-sm)}
.btn--nav:hover{background:var(--navy-700)}
.btn--sm{--h:42px;padding:0 18px;font-size:13px}

.lead--flush{margin-top:0}

.hero-motto{
  margin-top:20px;font-family:var(--mono);font-size:10px;font-weight:500;
  letter-spacing:.30em;text-transform:uppercase;color:rgba(255,255,255,.32);
}

section[id]{scroll-margin-top:96px}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13.5px;font-weight:700;color:var(--ink);
  border-bottom:1px solid var(--line);
  padding-bottom:3px;
  transition:gap .2s ease,border-color .2s ease,color .2s ease;
}
.link-arrow:hover{gap:13px;border-color:var(--ink)}
.link-arrow svg{width:13px;height:13px;flex:none}
.section--dark .link-arrow,.section--teal .link-arrow{color:#fff;border-color:var(--line-dark)}
.section--dark .link-arrow:hover,.section--teal .link-arrow:hover{border-color:var(--lime);color:var(--lime)}

/* ==========================================================================
   悬浮导航
   ========================================================================== */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:90;
  padding-top:18px;
  transition:padding-top .28s ease;
}
.nav-shell{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding-inline:var(--gutter);
}
.nav-bar{
  display:flex;align-items:center;gap:clamp(16px,3vw,44px);
  height:var(--nav-h);
  padding:0 12px 0 22px;
  background:rgba(255,255,255,.97);
  border:1px solid rgba(255,255,255,.6);
  border-radius:var(--r-md);
  box-shadow:0 10px 34px rgba(7,18,35,.10),0 1px 0 rgba(255,255,255,.9) inset;
  backdrop-filter:saturate(160%) blur(10px);
  transition:height .28s ease,box-shadow .28s ease;
}
.site-header.is-stuck{padding-top:10px}
.site-header.is-stuck .nav-bar{height:64px;box-shadow:0 14px 40px rgba(7,18,35,.16)}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;flex:none;color:var(--navy-800)}
.brand-mark{width:34px;height:34px;flex:none;transition:transform .3s ease}
.brand:hover .brand-mark{transform:rotate(-4deg) scale(1.04)}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-cn{font-size:17px;font-weight:700;letter-spacing:.10em;color:var(--ink)}
.brand-en{font-size:8px;font-weight:600;letter-spacing:.30em;color:var(--muted);margin-top:5px;text-transform:uppercase}

/* 菜单 */
.nav-menu{display:flex;align-items:center;gap:clamp(14px,2.1vw,30px);margin-left:auto}
.nav-menu a{
  position:relative;
  font-size:14.5px;font-weight:600;color:#2A3646;
  padding:6px 0;white-space:nowrap;
  transition:color .2s ease;
}
.nav-menu a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--lime-600);transform:scaleX(0);transform-origin:left;
  transition:transform .25s ease;
}
.nav-menu a:hover{color:var(--ink)}
.nav-menu a:hover::after,.nav-menu a.is-active::after{transform:scaleX(1)}
.nav-menu a.is-active{color:var(--ink)}

.nav-actions{display:flex;align-items:center;gap:10px;flex:none}
.nav-toggle{
  display:none;width:44px;height:44px;border-radius:var(--r-sm);
  border:1px solid var(--line);align-items:center;justify-content:center;
}
.nav-toggle span{display:block;width:18px;height:1.5px;background:var(--ink);position:relative}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:1.5px;background:var(--ink);
  transition:transform .25s ease;
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* 移动端抽屉 */
.mobile-panel{
  position:fixed;inset:0;z-index:85;
  background:var(--navy-900);
  padding:110px var(--gutter) 40px;
  display:flex;flex-direction:column;
  transform:translateY(-100%);
  opacity:0;visibility:hidden;
  transition:transform .42s cubic-bezier(.22,.61,.36,1),opacity .3s ease,visibility .42s;
}
.mobile-panel.is-open{transform:translateY(0);opacity:1;visibility:visible}
.mobile-panel a{
  display:flex;align-items:baseline;gap:14px;
  padding:20px 0;border-bottom:1px solid rgba(255,255,255,.10);
  font-family:var(--display);font-weight:300;font-size:26px;color:#fff;
}
.mobile-panel a i{font-family:var(--mono);font-style:normal;font-size:11px;color:var(--lime);letter-spacing:.1em}
.mobile-panel .mp-foot{margin-top:auto;padding-top:32px;color:rgba(255,255,255,.5);font-size:13px;line-height:2}
.mobile-panel .mp-foot b{color:#fff;font-weight:600}

/* ==========================================================================
   首屏
   ========================================================================== */
.hero{
  position:relative;
  background:var(--navy-900);
  color:#fff;
  padding-top:calc(var(--nav-h) + 64px);
  padding-bottom:clamp(44px,4.6vw,58px);
  overflow:hidden;
  isolation:isolate;
}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-2;
  background:
    radial-gradient(900px 620px at 82% 26%,rgba(14,70,60,.55),transparent 66%),
    radial-gradient(760px 520px at 8% 6%,rgba(25,52,86,.85),transparent 62%),
    linear-gradient(180deg,#08152A 0%,#071223 100%);
}
.hero::after{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:88px 88px;
  mask-image:radial-gradient(circle at 50% 30%,#000 10%,transparent 78%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000 10%,transparent 78%);
}

.hero-grid{
  position:relative;z-index:2;
  display:grid;grid-template-columns:minmax(0,1.06fr) minmax(0,.94fr);
  gap:clamp(32px,5vw,72px);align-items:center;
  padding-block:0;
}

.hero-eyebrow{
  display:inline-flex;align-items:center;gap:12px;
  padding:7px 14px 7px 10px;
  border:1px solid rgba(255,255,255,.16);
  border-radius:var(--r-pill);
  font-size:12.5px;letter-spacing:.05em;color:rgba(255,255,255,.82);
  background:rgba(255,255,255,.04);
}
.hero-eyebrow em{
  font-style:normal;font-size:10px;font-weight:700;letter-spacing:.16em;
  color:var(--navy-900);background:var(--lime);
  padding:3px 8px;border-radius:var(--r-pill);
}

.hero h1{
  font-family:var(--display);
  font-weight:300;
  font-size:clamp(38px,5.4vw,74px);
  line-height:1.22;
  letter-spacing:.01em;
  margin-top:clamp(18px,2.4vw,28px);
  color:#fff;
}
.hero h1 b{
  font-weight:700;
  display:inline-block;
  position:relative;
  color:var(--lime);
}
.hero h1 .l3{display:block;color:#fff}

.hero-sub{
  margin-top:24px;
  font-size:clamp(15px,1.2vw,17px);
  line-height:1.9;
  color:rgba(255,255,255,.74);
  max-width:34em;
}
.hero-sub .dot{margin:0 10px;color:rgba(255,255,255,.3)}

.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:clamp(28px,3.4vw,40px)}

.hero-meta{
  display:flex;flex-wrap:wrap;gap:clamp(20px,3.2vw,44px);
  margin-top:clamp(28px,3.2vw,42px);
  padding-top:22px;
  border-top:1px solid rgba(255,255,255,.12);
}
.hero-meta div{min-width:112px}
.hero-meta b{
  display:block;font-family:var(--display);font-weight:300;
  font-size:clamp(24px,2.2vw,30px);line-height:1.1;color:#fff;
  letter-spacing:.01em;
}
.hero-meta b i{font-style:normal;font-size:.56em;color:var(--lime);margin-left:2px;font-weight:600;vertical-align:.18em}
.hero-meta span{display:block;font-size:12px;color:rgba(255,255,255,.5);margin-top:9px;letter-spacing:.04em}

/* 首屏右侧：证据链视觉 */
.hero-visual{
  position:relative;
  min-height:clamp(380px,46vw,540px);
  display:flex;align-items:center;justify-content:flex-end;
}
.hv-plane{
  position:absolute;top:0;bottom:0;right:-7%;width:54%;z-index:0;
  background:
    radial-gradient(78% 62% at 74% 26%,rgba(216,242,107,.13),transparent 62%),
    linear-gradient(152deg,rgba(15,72,61,.92) 0%,rgba(9,32,56,.78) 46%,rgba(7,18,35,.16) 100%);
  clip-path:polygon(30% 0,100% 0,100% 100%,0 100%);
}
.hv-edge{
  position:absolute;top:0;bottom:0;right:-7%;width:54%;z-index:0;
  clip-path:polygon(30% 0,calc(30% + 2px) 0,calc(2px) 100%,0 100%);
  background:linear-gradient(180deg,rgba(216,242,107,.85),rgba(216,242,107,.5) 46%,rgba(216,242,107,.03) 100%);
}
.hv-rings{
  position:absolute;right:-14%;top:50%;translate:0 -50%;
  width:min(78%,460px);aspect-ratio:1;pointer-events:none;opacity:.5;
}
.hv-rings span{
  position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(216,242,107,.16);
}
.hv-rings span:nth-child(2){inset:16%}
.hv-rings span:nth-child(3){inset:32%;border-color:rgba(216,242,107,.26)}

.chain{
  position:relative;z-index:2;
  width:100%;max-width:430px;
  margin-right:clamp(0px,2vw,18px);
  background:rgba(9,26,46,.62);
  border:1px solid rgba(255,255,255,.12);
  border-radius:var(--r-md);
  padding:clamp(20px,2vw,26px);
  box-shadow:var(--sh-3);
  backdrop-filter:blur(14px) saturate(130%);
}
.chain-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:16px;margin-bottom:6px;border-bottom:1px solid rgba(255,255,255,.1);
}
.chain-head b{font-size:13.5px;font-weight:700;color:#fff;letter-spacing:.04em}
.chain-head span{
  font-size:9.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;
  color:var(--lime);border:1px solid rgba(216,242,107,.36);border-radius:var(--r-pill);
  padding:3px 9px;white-space:nowrap;
}
.chain-steps{position:relative;padding-top:6px}
.chain-steps::before{
  content:"";position:absolute;left:17px;top:22px;bottom:26px;width:1px;
  background:linear-gradient(180deg,rgba(216,242,107,.6),rgba(255,255,255,.08));
}
.chain-steps li{
  position:relative;display:flex;gap:16px;
  padding:12px 0;
}
.chain-num{
  flex:none;width:35px;height:35px;border-radius:50%;
  display:grid;place-items:center;
  font-family:var(--mono);font-size:11px;letter-spacing:.02em;
  color:var(--lime);background:rgba(216,242,107,.09);
  border:1px solid rgba(216,242,107,.3);
  position:relative;z-index:1;
}
.chain-body b{display:block;font-size:13.5px;color:#fff;font-weight:700;letter-spacing:.03em}
.chain-body i{
  display:block;font-style:normal;font-size:11.5px;line-height:1.6;
  color:rgba(255,255,255,.5);margin-top:4px;
}
.chain-foot{
  margin-top:8px;padding-top:14px;border-top:1px solid rgba(255,255,255,.08);
  font-size:10.5px;color:rgba(255,255,255,.4);letter-spacing:.06em;
  display:flex;justify-content:space-between;gap:10px;
}

/* ==========================================================================
   法规滚动条
   ========================================================================== */
.stdbar{
  background:#050F1E;
  border-top:1px solid rgba(255,255,255,.07);
  border-bottom:1px solid rgba(255,255,255,.07);
  padding-block:18px;
  overflow:hidden;
  position:relative;
}
.stdbar::before,.stdbar::after{
  content:"";position:absolute;top:0;bottom:0;width:90px;z-index:2;pointer-events:none;
}
.stdbar::before{left:0;background:linear-gradient(90deg,#050F1E,transparent)}
.stdbar::after{right:0;background:linear-gradient(270deg,#050F1E,transparent)}
.stdbar-inner{display:flex;align-items:center;gap:clamp(16px,2vw,30px)}
.stdbar-label{
  flex:none;font-size:10.5px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:rgba(255,255,255,.36);white-space:nowrap;
}
.std-track{overflow:hidden;flex:1;mask-image:linear-gradient(90deg,transparent,#000 3%,#000 97%,transparent)}
.std-row{display:flex;gap:clamp(22px,2.6vw,42px);width:max-content;animation:stdScroll 46s linear infinite}
.stdbar:hover .std-row{animation-play-state:paused}
.std-row span{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:rgba(255,255,255,.62);white-space:nowrap;
}
.std-row span::before{
  content:"";width:5px;height:5px;background:var(--lime);flex:none;
  rotate:45deg;opacity:.8;
}
@keyframes stdScroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
@media (prefers-reduced-motion:reduce){.std-row{animation:none}}

/* ---------- 滚动显现 ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* 返回顶部 */
.to-top{
  position:fixed;right:22px;bottom:22px;z-index:80;
  width:46px;height:46px;border-radius:50%;
  background:var(--navy-800);color:#fff;
  display:grid;place-items:center;
  box-shadow:var(--sh-2);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s,background .2s;
}
.to-top.is-on{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--teal-700)}
.to-top svg{width:15px;height:15px}