@charset "UTF-8";
/* ===========================================================
   技天予 · 官网样式
   设计原则：大留白、少元素、一个屏幕一个主张
   =========================================================== */

:root{
  --ink:#0B0B0F;
  --ink-2:#4A4A4F;
  --muted:#86868B;
  --line:rgba(0,0,0,.09);
  --soft:#F5F5F7;
  --brand:#0C447C;
  --radius:18px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:#fff;color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC",
    "Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,p{margin:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}

.container{width:min(1080px,100% - 48px);margin-inline:auto}
section[id]{scroll-margin-top:72px}

/* ---------------- 导航 ---------------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:50;height:60px;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:border-color .3s var(--ease),background .3s var(--ease);
}
.nav.scrolled{
  border-bottom-color:var(--line);background:rgba(255,255,255,.86);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  backdrop-filter:saturate(180%) blur(18px);
}
.nav-inner{
  width:min(1080px,100% - 48px);margin-inline:auto;height:100%;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{position:relative;display:block}
.brand img{height:26px;width:auto;transition:opacity .3s var(--ease)}
.brand .logo-light{position:absolute;left:0;top:0;opacity:0}
.nav:not(.scrolled) .logo-dark{opacity:0}
.nav:not(.scrolled) .logo-light{opacity:1}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-links a{
  font-size:14px;color:rgba(255,255,255,.76);letter-spacing:.01em;
  transition:color .2s var(--ease);
}
.nav-links a:hover{color:#fff}
.nav.scrolled .nav-links a{color:var(--ink-2)}
.nav.scrolled .nav-links a:hover{color:var(--ink)}
.nav-links .nav-cta{
  height:34px;padding:0 18px;border-radius:100px;
  display:inline-flex;align-items:center;
  background:#fff;color:var(--ink);font-size:13.5px;
  transition:opacity .2s var(--ease),background .25s var(--ease),color .25s var(--ease);
}
.nav-links .nav-cta:hover{color:var(--ink);opacity:.82}
.nav.scrolled .nav-links .nav-cta{background:var(--ink);color:#fff}
.nav.scrolled .nav-links .nav-cta:hover{color:#fff}
.nav-toggle{display:none;width:44px;height:44px;position:relative;margin-right:-10px}
.nav-toggle span{
  position:absolute;left:11px;right:11px;height:1.5px;background:#fff;
  transition:transform .3s var(--ease),opacity .2s var(--ease),background .3s var(--ease);
}
.nav.scrolled .nav-toggle span{background:var(--ink)}
.nav-toggle span:nth-child(1){top:17px}
.nav-toggle span:nth-child(2){top:22px}
.nav-toggle span:nth-child(3){top:27px}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------------- 首屏 ---------------- */
.hero{
  position:relative;min-height:100vh;min-height:100svh;
  display:flex;flex-direction:column;
  padding:60px 0 0;overflow:hidden;
  background:#07131f;color:#fff;
}
.hero-bg{
  position:absolute;inset:0;
  background:url("../img/hero-city.jpg") center 45%/cover no-repeat;
  transform:scale(1.03);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(120% 90% at 50% 0%,rgba(4,12,22,.42) 0%,rgba(4,12,22,.78) 62%,rgba(4,12,22,.94) 100%),
    linear-gradient(180deg,rgba(4,12,22,.55) 0%,rgba(4,12,22,0) 30%);
}
.hero-inner{
  position:relative;z-index:1;text-align:center;
  flex:1;display:flex;flex-direction:column;justify-content:center;
  padding-bottom:40px;
}
.eyebrow{
  font-size:13.5px;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(255,255,255,.62);
}
.brandline{
  font-family:"Songti SC","STSong",Georgia,serif;
  font-size:clamp(24px,2.8vw,36px);font-weight:600;
  letter-spacing:.36em;text-indent:.36em;
  color:rgba(255,255,255,.94);
}
.slogan{
  margin-top:30px;
  font-size:clamp(18px,2vw,26px);font-weight:500;
  letter-spacing:.3em;text-indent:.3em;
  color:rgba(255,255,255,.82);
}
.hero h1{
  margin:38px 0 0;
  font-size:clamp(32px,5vw,64px);line-height:1.16;font-weight:700;letter-spacing:-.025em;
}
.hero-actions{
  display:flex;justify-content:center;flex-wrap:wrap;gap:14px;margin-top:44px;
}
.btn{
  height:48px;padding:0 30px;border-radius:100px;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:500;
  transition:transform .25s var(--ease),background .25s var(--ease),opacity .25s var(--ease);
}
.btn-solid{background:#fff;color:var(--ink)}
.btn-solid:hover{transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.36);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1)}
.hero-foot{
  position:relative;z-index:1;
  width:min(1080px,100% - 48px);margin-inline:auto;
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  padding:26px 0 40px;
  border-top:1px solid rgba(255,255,255,.14);
  font-size:14px;letter-spacing:.05em;color:rgba(255,255,255,.6);
}

/* ---------------- 四模块 ---------------- */
.section{padding:120px 0}
.section-soft{background:var(--soft)}

.tabs{
  display:flex;gap:38px;border-bottom:1px solid var(--line);
}
.tab{
  position:relative;display:flex;align-items:baseline;gap:10px;
  padding:0 0 18px;margin-bottom:-1px;
  color:var(--muted);border-bottom:2px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.tab-num{font-size:11px;letter-spacing:.1em;opacity:.75;font-variant-numeric:tabular-nums}
.tab-name{font-size:16px;font-weight:500;letter-spacing:.02em}
.tab:hover{color:var(--ink-2)}
.tab.is-active{color:var(--ink);border-bottom-color:var(--ink)}
.tab.is-active .tab-name{font-weight:600}

.panels{padding-top:64px;min-height:440px}
.panel{display:none}
.panel.is-active{display:block;animation:rise .55s var(--ease) both}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

.panel h2{
  font-size:clamp(30px,3.9vw,48px);line-height:1.16;font-weight:700;letter-spacing:-.025em;
}
.panel .lead{
  margin-top:24px;max-width:31em;
  font-size:clamp(16.5px,1.5vw,19px);line-height:1.85;color:var(--ink-2);
}
.kws{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:56px;
}
.kw{
  background:#fff;border-radius:var(--radius);padding:36px 30px 38px;
  box-shadow:0 1px 2px rgba(0,0,0,.04);
  transition:transform .32s var(--ease),box-shadow .32s var(--ease);
}
.kw:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(0,0,0,.07)}
.kw h3{font-size:21px;font-weight:600;letter-spacing:0}
.kw p{margin-top:14px;font-size:16px;line-height:1.78;color:var(--muted)}

.adv{
  display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:56px;
}
.adv-item{
  background:#fff;border-radius:var(--radius);padding:36px 34px 40px;
  box-shadow:0 1px 2px rgba(0,0,0,.04);
  transition:transform .32s var(--ease),box-shadow .32s var(--ease);
}
.adv-item:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(0,0,0,.07)}
.adv-num{font-size:13.5px;letter-spacing:.18em;font-weight:500;color:var(--muted);font-variant-numeric:tabular-nums}
.adv-item h3{margin-top:18px;font-size:23px;font-weight:600;letter-spacing:-.01em}
.adv-item p{margin-top:12px;font-size:16px;line-height:1.75;color:var(--muted)}
.punch{
  margin-top:48px;font-size:clamp(20px,2.2vw,28px);font-weight:600;
  letter-spacing:-.015em;color:var(--ink);
}

.compare{display:flex;gap:14px;flex-wrap:wrap;margin-top:48px}
.cmp{
  display:inline-flex;align-items:center;gap:10px;
  height:56px;padding:0 28px;border-radius:100px;
  font-size:18px;font-weight:600;letter-spacing:.02em;
}
.cmp-old{background:#fff;border:1px solid var(--line);color:#9B9BA1}
.cmp-new{background:var(--ink);color:#fff}
.cmp-x,.cmp-y{font-size:15px;opacity:.85}

/* ---------------- 黑场标语 ---------------- */
.band{background:#0A0A0A;padding:150px 0;text-align:center}
.band h2{
  font-size:clamp(26px,4.2vw,56px);line-height:1.2;font-weight:700;
  letter-spacing:-.03em;color:#fff;
}

/* ---------------- 联系 ---------------- */
.contact{text-align:center;padding:150px 0}
.contact .eyebrow{color:var(--muted)}
.contact h2{
  margin:24px auto 40px;max-width:22em;
  font-size:clamp(26px,3.6vw,44px);line-height:1.2;font-weight:700;letter-spacing:-.025em;
}
.phone{
  display:inline-block;font-size:clamp(32px,4.6vw,56px);font-weight:700;
  letter-spacing:-.02em;font-variant-numeric:tabular-nums;
  transition:color .25s var(--ease);
}
.phone:hover{color:var(--brand)}
.note{margin-top:18px;font-size:14px;color:var(--muted);letter-spacing:.03em}

/* ---------------- 页脚 ---------------- */
.footer{background:var(--soft);padding:60px 0 52px}
.footer-inner{display:flex;flex-direction:column;align-items:center;text-align:center;gap:16px}
.footer-logo{height:22px;width:auto;opacity:.85}
.footer-entities{font-size:13px;color:var(--muted);letter-spacing:.01em}
.footer-meta{font-size:12px;color:#A1A1A6}

/* ---------------- 入场（无 JS 时直接可见） ---------------- */
.reveal{opacity:1}
html.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
html.js .reveal.in{opacity:1;transform:none}

/* ---------------- 响应式 ---------------- */
@media (max-width:900px){
  .nav-toggle{display:block}
  .nav-links{
    position:fixed;top:60px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(255,255,255,.98);
    border-bottom:1px solid var(--line);
    padding:8px 24px 22px;
    opacity:0;transform:translateY(-8px);pointer-events:none;
    transition:opacity .28s var(--ease),transform .28s var(--ease);
  }
  .nav-links.open{opacity:1;transform:none;pointer-events:auto}
  .nav-links a{padding:15px 0;font-size:16px;border-bottom:1px solid var(--line);color:var(--ink-2)}
  .nav-links .nav-cta{margin-top:16px;justify-content:center;border-bottom:0;height:44px;background:var(--ink);color:#fff}

  .section{padding:88px 0}
  .hero-foot{justify-content:flex-start;gap:14px 28px}

  .tabs{display:grid;grid-template-columns:1fr 1fr;gap:0 20px;border-bottom:0}
  .tab{flex:none;padding:16px 0;margin:0;border-bottom:1px solid var(--line)}
  .tab.is-active{border-bottom-width:1px}
  .tab-name{font-size:15.5px}
  .tab.is-active .tab-name{font-weight:600}

  .panels{padding-top:44px;min-height:0}
  .kws{grid-template-columns:1fr;gap:14px;margin-top:36px}
  .adv{grid-template-columns:1fr;gap:14px;margin-top:36px}
  .band{padding:110px 0}
  .contact{padding:110px 0}
}

@media (max-width:600px){
  .container,.nav-inner,.hero-foot{width:calc(100% - 40px)}
  .hero{min-height:88vh;min-height:88svh}
  .hero h1{font-size:29px;line-height:1.24;letter-spacing:-.01em}
  .slogan{margin-top:22px;font-size:17px;letter-spacing:.22em;text-indent:.22em}
  .hero-actions .btn{flex:1 1 100%}
  .hero-foot{gap:10px 22px;font-size:13px}
  .panel h2{font-size:28px}
  .kw{padding:30px 26px 32px}
  .kw h3{font-size:20px}
  .kw p{font-size:15.5px}
  .cmp{height:52px;padding:0 22px;font-size:16.5px}
  .adv-item{padding:30px 26px 34px}
  .adv-item h3{font-size:21px}
  .adv-item p{font-size:15.5px}
  .footer-entities{line-height:1.9}
}

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