/* 栀禾网络科技工作室 · www.zv0.cn
   风格：浅色企业风，蓝色主色，卡片式布局
   结构：变量 → 基础 → 头部 → 首屏 → 通用区块 → 关于 → 业务 → 流程 → 联系 → 页脚 → 动效 → 响应式 */

/* ===== 变量 ===== */
:root{
  --bg:#f6f8fc;
  --surface:#ffffff;
  --text:#0f1729;
  --muted:#5c667e;
  --line:#e4e9f4;
  --brand:#2f5bff;
  --brand-dark:#1f43d6;
  --brand-soft:#eef3ff;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 10px 30px rgba(21,38,84,.07);
  --shadow-lg:0 18px 45px rgba(21,38,84,.12);
  --container:1120px;
}

/* ===== 基础 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-dark)}
h1,h2,h3{line-height:1.3;margin:0 0 .5em;font-weight:700;letter-spacing:.2px}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 20px}
.skip-link{position:absolute;left:-9999px;top:0}
.skip-link:focus{left:12px;top:12px;background:var(--brand);color:#fff;padding:8px 14px;border-radius:8px;z-index:100}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px}

/* ===== 头部 ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:16px;min-height:68px;position:relative}
.brand{display:flex;align-items:center;gap:12px;color:var(--text)}
.brand:hover{color:var(--text)}
.brand-mark{
  width:38px;height:38px;flex:0 0 38px;border-radius:11px;
  background:linear-gradient(135deg,var(--brand),#6f8cff);
  color:#fff;font-size:19px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:16px}
.brand-text small{color:var(--muted);font-size:12px}
.nav{margin-left:auto;display:flex;align-items:center;gap:26px}
.nav a{color:#2b3448;font-size:15px}
.nav a:hover{color:var(--brand)}
.nav-cta{
  background:var(--brand);color:#fff!important;padding:9px 18px;
  border-radius:999px;font-weight:600;
  box-shadow:0 6px 16px rgba(47,91,255,.28);
}
.nav-cta:hover{background:var(--brand-dark);color:#fff!important}
.nav-toggle{
  display:none;margin-left:auto;width:42px;height:42px;
  border:1px solid var(--line);background:var(--surface);border-radius:var(--radius-sm);
  padding:10px;cursor:pointer;
}
.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:2px}
.nav-toggle span+span{margin-top:5px}

/* ===== 首屏 ===== */
.hero{background:linear-gradient(180deg,#eef3ff 0%,var(--bg) 78%);padding:72px 0 64px}
.hero-inner{display:grid;grid-template-columns:1.12fr .88fr;gap:44px;align-items:start}
.eyebrow{
  display:inline-block;margin:0 0 14px;padding:5px 13px;
  background:var(--brand-soft);color:var(--brand-dark);
  border-radius:999px;font-size:13px;font-weight:600;letter-spacing:.4px;
}
.hero h1{font-size:40px;margin-bottom:14px}
.lead{font-size:17px;color:var(--muted);max-width:34em}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 22px}
.btn{
  display:inline-block;padding:12px 24px;border-radius:999px;
  font-weight:600;font-size:15px;border:1px solid transparent;transition:.2s;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(47,91,255,.26)}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px)}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px}
.hero-tags li{
  background:#fff;border:1px solid var(--line);color:var(--muted);
  padding:6px 13px;border-radius:999px;font-size:13px;
}
.hero-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-lg);
}
.hero-card-title{font-size:18px;margin-bottom:14px}
.check-list li{position:relative;padding-left:26px;margin-bottom:10px;color:#2b3448;font-size:15px}
.check-list li::before{
  content:"";position:absolute;left:0;top:.62em;width:14px;height:8px;
  border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);
  transform:rotate(-45deg);
}
.hero-card-link{display:inline-block;margin-top:8px;font-weight:600;font-size:15px}

/* ===== 通用区块 ===== */
.section{padding:76px 0}
.section-alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:720px;margin-bottom:40px}
.section-head h2{font-size:30px}
.section-desc{color:var(--muted)}

/* ===== 关于我们 ===== */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start}
.about-text p{color:#39425a}
.about-points{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.point{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px}
.section-alt .point{background:var(--bg)}
.point h3{font-size:16px;margin-bottom:6px}
.point p{margin:0;color:var(--muted);font-size:14.5px}

/* ===== 业务范围 ===== */
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;transition:transform .2s,box-shadow .2s,border-color .2s;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d3ddf7}
.card-icon{
  width:44px;height:44px;border-radius:12px;background:var(--brand-soft);color:var(--brand);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;
}
.card-icon svg{width:23px;height:23px}
.card h3{font-size:17px;margin-bottom:8px}
.card p{margin:0;color:var(--muted);font-size:15px}

/* ===== 服务流程 ===== */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:20px}
.step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.step-no{display:block;font-size:13px;font-weight:700;letter-spacing:1px;color:var(--brand);margin-bottom:10px}
.step h3{font-size:17px;margin-bottom:8px}
.step p{margin:0;color:var(--muted);font-size:15px}

/* ===== 联系我们 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.contact-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.section-alt .contact-card{background:var(--bg)}
.contact-card h3{font-size:16px;margin-bottom:14px}
.emails li{margin-bottom:8px;font-size:15px;word-break:break-all}
.info div{display:flex;gap:10px;padding:7px 0;border-bottom:1px dashed var(--line)}
.info div:last-child{border-bottom:0}
.info dt{color:var(--muted);flex:0 0 84px;font-size:14.5px}
.info dd{margin:0;font-size:14.5px}
.contact-action p{color:var(--muted);font-size:15px}

/* ===== 页脚 ===== */
.site-footer{background:#fff;border-top:1px solid var(--line);padding:36px 0 30px}
.footer-inner{display:flex;flex-wrap:wrap;gap:18px;align-items:center;justify-content:space-between}
.footer-brand{display:flex;align-items:center;gap:12px}
.footer-brand strong{display:block;font-size:15px}
.footer-brand p{margin:2px 0 0;color:var(--muted);font-size:13px}
.footer-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-links a{color:#2b3448;font-size:14px}
.copyright{
  flex:1 0 100%;margin:18px 0 0;padding-top:18px;border-top:1px solid var(--line);
  color:var(--muted);font-size:13.5px;
}
.copyright a{color:var(--muted)}
.copyright a:hover{color:var(--brand)}
.copyright .sep{margin:0 8px;color:#c3cbdd}

/* ===== 返回顶部 ===== */
.back-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;
  box-shadow:0 10px 24px rgba(47,91,255,.3);opacity:0;pointer-events:none;transition:.25s;
}
.back-top svg{width:20px;height:20px}
.back-top.is-on{opacity:1;pointer-events:auto}
.back-top:hover{background:var(--brand-dark);color:#fff}

/* ===== 滚动动效 ===== */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.js .reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none;transition:none}
  .back-top{transition:none}
}

/* ===== 响应式 ===== */
@media (max-width:920px){
  .hero-inner,.about-grid{grid-template-columns:1fr;gap:32px}
  .hero{padding:52px 0 44px}
  .hero h1{font-size:32px}
  .section{padding:56px 0}
  .section-head h2{font-size:25px}
}
@media (max-width:760px){
  .nav-toggle{display:block}
  .nav{
    position:absolute;top:100%;left:0;right:0;margin:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--surface);border-bottom:1px solid var(--line);
    padding:8px 20px 16px;display:none;
  }
  .nav.is-open{display:flex}
  .nav a{padding:11px 0;border-bottom:1px solid var(--line);font-size:16px}
  .nav a:last-child{border-bottom:0}
  .nav-cta{text-align:center;margin-top:12px}
  .about-points{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .hero-card{padding:22px}
}
@media (max-width:420px){
  .hero h1{font-size:25px}
  .btn{width:100%;text-align:center}
  .hero-actions{gap:10px}
}