/* ============================================================
   幻实科技 · 企业 AI 赋能与落地
   设计语言：科技简约 — 大留白 + 克制 + 靛蓝→青绿渐变
   纯手写，无框架依赖。移动优先，渐进增强。
   ============================================================ */

:root{
  /* 色板 */
  --bg:#ffffff;
  --blue-50:#F4F6FF; --blue-100:#E6E9FF; --blue-200:#C9CEFB;
  --ink:#0F172A; --ink-2:#5A6478; --ink-3:#6B7690; --ink-4:#97A1B5;
  --line:#E9EEF7; --line-2:#F2F5FB;
  --blue:#4338CA; --blue-2:#6366F1; --blue-deep:#3730A3; --on-blue:#fff;
  --teal:#2DD4BF; --teal-lt:#DCF7F2; --teal-deep:#0D9488;
  --grad:linear-gradient(120deg,#4338CA 0%,#6366F1 45%,#2DD4BF 100%);
  --grad-soft:linear-gradient(120deg,#EEF0FF 0%,#F4F6FF 50%,#E7FBF6 100%);

  /* 尺度 */
  --radius:22px; --radius-sm:14px; --radius-lg:30px;
  --shadow:0 1px 2px rgba(14,20,48,.04),0 18px 44px rgba(67,56,202,.10);
  --shadow-soft:0 1px 2px rgba(14,20,48,.04),0 10px 30px rgba(14,20,48,.06);
  --shadow-lg:0 30px 60px -24px rgba(14,20,48,.28),0 4px 12px rgba(14,20,48,.06);

  /* 字体与布局 */
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --mono:"SF Mono","SFMono-Regular",ui-monospace,Menlo,monospace;
  --ease:cubic-bezier(.19,1,.22,1);
  --gut:clamp(20px,5vw,72px);
  --max:1200px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--sans);background:var(--bg);color:var(--ink);
  line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none}
img,svg{display:block;max-width:100%}
ul{list-style:none}
::selection{background:var(--blue);color:#fff}
.footer ::selection{background:var(--teal);color:var(--ink)}

/* 键盘焦点态（WCAG 2.4.7）— :where() 零特异性，不覆盖组件自身样式 */
:where(a,button,summary,input,textarea,.btn):focus-visible{
  outline:2px solid var(--blue);outline-offset:3px;border-radius:6px;
}

/* ---------- 布局工具 ---------- */
.wrap{max-width:var(--max);margin:0 auto;padding-left:var(--gut);padding-right:var(--gut)}
.section{padding:clamp(56px,9vw,110px) 0}
.label{
  display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--blue);font-weight:600;margin-bottom:16px;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;
  color:var(--blue);background:var(--blue-50);border:1px solid var(--blue-100);
  padding:7px 15px;border-radius:999px;margin-bottom:20px;
}
.h1{font-size:clamp(30px,5.4vw,54px);line-height:1.15;font-weight:800;letter-spacing:-.02em}
.h2{font-size:clamp(25px,3.8vw,40px);line-height:1.2;font-weight:800;letter-spacing:-.02em}
.h3{font-size:clamp(19px,2.2vw,23px);line-height:1.3;font-weight:700}
.lead{font-size:clamp(15.5px,1.7vw,18.5px);color:var(--ink-2);line-height:1.75}
.muted{color:var(--ink-2)}
.center{text-align:center}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head{max-width:720px;margin:0 auto clamp(40px,6vw,64px);text-align:center}
.sec-head .lead{margin-top:16px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  font-size:15px;font-weight:700;padding:14px 26px;border-radius:999px;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),background .25s,color .25s,border-color .25s;
  white-space:nowrap;
}
.btn-primary{background:var(--blue);color:var(--on-blue);
  box-shadow:0 1px 2px rgba(30,27,75,.2),0 10px 22px rgba(67,56,202,.24)}
.btn-primary:hover{background:var(--blue-deep);transform:translateY(-2px);
  box-shadow:0 2px 6px rgba(30,27,75,.24),0 16px 34px rgba(67,56,202,.32)}
.btn-teal{background:linear-gradient(135deg,#5EEAD4,#2DD4BF 60%,#0D9488);color:#fff;
  box-shadow:0 1px 2px rgba(13,148,136,.2),0 10px 22px rgba(45,212,191,.26)}
.btn-teal:hover{transform:translateY(-2px);box-shadow:0 2px 6px rgba(13,148,136,.24),0 16px 32px rgba(45,212,191,.34)}
.btn-ghost{background:rgba(255,255,255,.72);color:var(--ink);border:1.5px solid var(--blue-200);
  backdrop-filter:blur(8px);box-shadow:var(--shadow-soft)}
.btn-ghost:hover{color:var(--blue-deep);border-color:var(--blue);transform:translateY(-2px)}
.btn-lg{font-size:16.5px;padding:17px 36px;border-radius:16px}
.btn .arw{transition:transform .35s var(--ease)}
.btn:hover .arw{transform:translateX(4px)}

/* ============ 顶栏 ============ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:80;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px var(--gut);
  transition:background .4s var(--ease),box-shadow .4s var(--ease),padding .4s var(--ease);
}
.nav.float{
  background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  box-shadow:0 1px 0 var(--line);padding-top:11px;padding-bottom:11px;
}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:18px;letter-spacing:-.01em;color:var(--ink)}
.brand img{height:30px;width:auto}
.nav .brand img{height:37px}
.brand small{font-family:var(--mono);font-weight:600;color:var(--ink-4);font-size:11px;letter-spacing:.06em}
.nav-links{display:none;align-items:center;gap:clamp(14px,1.8vw,30px)}
.nav-links a{font-size:15px;font-weight:600;color:var(--ink-2);transition:color .2s var(--ease)}
.nav-links a:hover,.nav-links a.active{color:var(--blue)}
.nav-right{display:flex;align-items:center;gap:12px}
.nav-cta{display:none}

/* 汉堡 */
.burger{display:inline-flex;flex-direction:column;gap:5px;width:44px;height:44px;
  align-items:center;justify-content:center;border-radius:12px}
.burger span{display:block;width:22px;height:2px;background:var(--ink);border-radius:2px;
  transition:transform .3s var(--ease),opacity .3s var(--ease)}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 移动端抽屉 */
.drawer{
  position:fixed;inset:0 0 0 auto;width:min(320px,84vw);z-index:79;
  background:#fff;box-shadow:var(--shadow-lg);padding:88px 26px 32px;
  transform:translateX(100%);transition:transform .4s var(--ease);
  display:flex;flex-direction:column;gap:6px;
}
.drawer.open{transform:translateX(0)}
.drawer a{font-size:18px;font-weight:600;color:var(--ink);padding:14px 8px;border-bottom:1px solid var(--line-2)}
.drawer a:hover{color:var(--blue)}
.drawer .btn{margin-top:20px}
.scrim{position:fixed;inset:0;background:rgba(15,23,42,.4);z-index:78;opacity:0;visibility:hidden;transition:opacity .35s}
.scrim.open{opacity:1;visibility:visible}

/* ============ Hero ============ */
.hero{position:relative;padding:130px 0 clamp(60px,9vw,104px);overflow:hidden;background:var(--grad-soft)}
.hero::before{content:"";position:absolute;top:-30%;right:-10%;width:640px;height:640px;
  background:radial-gradient(closest-side,rgba(99,102,241,.22),transparent);z-index:0}
.hero::after{content:"";position:absolute;bottom:-30%;left:-12%;width:560px;height:560px;
  background:radial-gradient(closest-side,rgba(45,212,191,.2),transparent);z-index:0}
.hero .wrap{position:relative;z-index:1}
.hero .h1{max-width:16em}
.hero .lead{max-width:34em;margin-top:22px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero-cta .btn{flex:0 1 auto}
.hero-stats{display:flex;flex-wrap:wrap;gap:clamp(24px,5vw,56px);margin-top:52px}
.hero-stats .num{font-size:clamp(26px,4vw,40px);font-weight:800;letter-spacing:-.02em;line-height:1}
.hero-stats .num span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats .cap{font-size:13.5px;color:var(--ink-2);margin-top:8px}

/* ============ 卡片网格 ============ */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:1fr}
.grid-3{grid-template-columns:1fr}
.grid-4{grid-template-columns:1fr 1fr}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(24px,3vw,34px);box-shadow:var(--shadow-soft);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .3s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--blue-200)}
.card .ic{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;
  background:var(--blue-50);margin-bottom:18px;
  transition:transform .3s var(--ease),background .3s var(--ease)}
.card .ic img{width:26px;height:26px;object-fit:contain}
.card:hover .ic{transform:scale(1.06)}
.card.warm:hover .ic{background:var(--teal-lt)}
.card.warm .ic{background:var(--teal-lt)}
.card .ic.ic-app{width:auto;height:auto;border-radius:0;background:transparent;padding:0}
.card .ic.ic-app img{width:56px;height:56px;border-radius:12px}
.card.warm .ic.ic-app,.card.warm:hover .ic.ic-app{background:transparent}
.eyebrow .ic-inline{width:15px;height:15px;object-fit:contain;flex-shrink:0}
.bullet{position:relative;padding-left:18px;margin-bottom:10px;color:var(--ink-2);font-size:15px;line-height:1.65}
.bullet:last-child{margin-bottom:0}
.bullet::before{content:"";position:absolute;left:0;top:.65em;width:7px;height:7px;border-radius:2px;transform:rotate(45deg)}
.bullet.bad::before{background:var(--ink-4)}
.bullet.good::before{background:var(--teal)}
.card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15px;line-height:1.65}
.card .tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:16px}
.card .metric{margin-top:14px;padding-top:14px;border-top:1px dashed var(--line);
  font-size:13.5px;color:var(--ink-2);display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.card .metric strong{font-size:15px;font-weight:800;color:var(--blue);white-space:nowrap}
.card.warm .metric strong{color:var(--teal-deep)}
.disclaimer{max-width:820px;margin:32px auto 0;text-align:center;font-size:12.5px;
  color:var(--ink-3);line-height:1.7}
.tag{font-size:12px;font-weight:600;color:var(--ink-2);background:var(--line-2);
  border:1px solid var(--line);padding:4px 11px;border-radius:999px}

/* 序号步骤 */
.steps{counter-reset:s;display:grid;gap:20px}
.step{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px 28px;box-shadow:var(--shadow-soft)}
.step::before{counter-increment:s;content:"0" counter(s);font-family:var(--mono);font-size:14px;
  font-weight:700;color:var(--blue);background:var(--blue-50);border-radius:10px;
  padding:5px 11px;display:inline-block;margin-bottom:16px}
.step h3{font-size:18.5px;font-weight:700;margin-bottom:8px}
.step p{color:var(--ink-2);font-size:14.5px}

/* ============ 信任背书 ============ */
.trust{background:var(--blue-50);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.partners-wall{
  margin-top:14px;display:flex;flex-wrap:wrap;justify-content:center;gap:14px;
}
.partners-wall .partner{
  flex:0 1 calc(25% - 11px);max-width:220px;display:grid;place-items:center;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:10px 8px;min-height:108px;box-shadow:var(--shadow-soft);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.partners-wall .partner:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.partners-wall .partner img{width:auto;height:88px;max-width:96%;object-fit:contain}
@media (max-width:720px){
  .partners-wall{gap:12px}
  .partners-wall .partner{flex-basis:calc(50% - 6px);max-width:none;min-height:92px;padding:8px 6px}
  .partners-wall .partner img{height:72px}
}
.cred{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:36px}
.cred .item{text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:24px 14px}
.cred .item .num{font-size:clamp(24px,3.4vw,34px);font-weight:800}
.cred .item .num span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.cred .item .cap{font-size:13px;color:var(--ink-2);margin-top:6px}
.certs{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.certs .item{text-align:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:26px 14px 22px;
  transition:transform .4s var(--ease),box-shadow .4s var(--ease)}
.certs .item:hover{transform:translateY(-4px);box-shadow:var(--shadow-soft)}
.certs .item img{width:60px;height:60px;margin:0 auto 14px;border-radius:16px}
.certs .item .ct{font-size:15px;font-weight:700;color:var(--ink)}
.certs .item .cn{font-size:12.5px;color:var(--ink-3);margin-top:4px}

/* ============ 案例卡 ============ */
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-soft);transition:transform .4s var(--ease),box-shadow .4s var(--ease)}
.case:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.case .top{padding:26px 26px 4px}
.case .client{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}
.case .client strong{font-size:19px;font-weight:800}
.case .badge{font-size:12px;font-weight:700;color:#0B7B70;background:var(--teal-lt);padding:4px 11px;border-radius:999px}
.case dl{padding:6px 26px 26px;display:grid;gap:12px}
.case dt{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:2px}
.case dd{font-size:14.5px;color:var(--ink-2)}
.case dd.result{color:var(--ink);font-weight:600}

/* ============ FAQ ============ */
.faq{max-width:820px;margin:0 auto;display:grid;gap:14px}
.qa{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;transition:border-color .3s,box-shadow .3s}
.qa[open]{border-color:var(--blue-200);box-shadow:var(--shadow-soft)}
.qa summary{list-style:none;cursor:pointer;padding:20px 24px;font-size:16.5px;font-weight:700;
  display:flex;align-items:center;justify-content:space-between;gap:16px}
.qa summary::-webkit-details-marker{display:none}
.qa summary .pm{flex-shrink:0;width:22px;height:22px;position:relative;transition:transform .3s var(--ease)}
.qa summary .pm::before,.qa summary .pm::after{content:"";position:absolute;background:var(--blue);border-radius:2px}
.qa summary .pm::before{top:10px;left:2px;right:2px;height:2px}
.qa summary .pm::after{left:10px;top:2px;bottom:2px;width:2px;transition:transform .3s var(--ease)}
.qa[open] summary .pm::after{transform:scaleY(0)}
.qa .a{padding:0 24px 22px;color:var(--ink-2);font-size:15px;line-height:1.75}

/* ============ CTA 区块 ============ */
.cta-band{position:relative;overflow:hidden;background:var(--grad);color:#fff;border-radius:var(--radius-lg);
  padding:clamp(40px,6vw,66px) clamp(26px,5vw,60px);text-align:center;box-shadow:var(--shadow)}
.cta-band h2{color:#fff;font-size:clamp(24px,3.6vw,38px);font-weight:800;letter-spacing:-.02em}
.cta-band p{color:rgba(255,255,255,.92);margin-top:14px;font-size:16px;max-width:34em;margin-left:auto;margin-right:auto}
.cta-band .qr{margin:28px auto 0;background:#fff;border-radius:20px;padding:14px;width:172px;box-shadow:var(--shadow-lg)}
.cta-band .qr img{border-radius:10px;width:100%}
.cta-band .qr-cap{color:rgba(255,255,255,.9);font-size:14px;margin-top:14px;font-weight:600}

/* ============ 页脚 ============ */
.footer{background:var(--ink);color:#C7CEDB;padding:clamp(48px,7vw,72px) 0 32px}
.footer .cols{display:grid;grid-template-columns:1fr;gap:40px}
.footer .brand{color:#fff;margin-bottom:18px}
.footer .brand img{height:37px}
.footer .brand small{color:#7C8698}
.footer p{font-size:14px;color:#9AA4B4;margin-bottom:10px}
.footer a{color:#9AA4B4;transition:color .2s}
.footer a:hover{color:#fff}
.footer h4{color:#fff;font-size:14px;font-weight:700;margin-bottom:16px;letter-spacing:.02em}
.footer .flinks{display:flex;flex-direction:column;gap:11px;font-size:14px}
.footer .qr-mini{width:110px;background:#fff;border-radius:12px;padding:8px}
.footer .qr-mini img{width:100%;border-radius:6px}
.footer .qr-mini + p{margin-top:10px;font-size:12.5px;color:#7C8698}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:44px;padding-top:24px;
  display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between;font-size:13px;color:#7C8698}
.footer-bottom a{color:#7C8698}

/* ---------- 滚动揭示 ---------- */
.rv{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}

/* ============ 响应式 ============ */
@media (min-width:768px){
  .grid-2{grid-template-columns:1fr 1fr}
  .grid-3{grid-template-columns:1fr 1fr}
  .grid-4{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
  .cred{grid-template-columns:repeat(4,1fr)}
  .certs{grid-template-columns:repeat(4,1fr)}
  .footer .cols{grid-template-columns:2fr 1fr 1fr}
}
@media (min-width:1024px){
  .nav-links{display:flex}
  .nav-cta{display:inline-flex}
  .burger{display:none}
  .grid-3{grid-template-columns:repeat(3,1fr)}
  .grid-4{grid-template-columns:repeat(4,1fr)}
  .steps{grid-template-columns:repeat(4,1fr)}
  .hero .h1{font-size:clamp(40px,4.4vw,58px)}
}

@media (max-width:479px){
  .hero-cta{flex-direction:column;align-items:stretch}
  .hero-cta .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important}
  .rv{opacity:1!important;transform:none!important;transition:none!important}
  .btn,.card,.case{transition:none!important}
}