/* ============================================================
   ziweiyuan.qi-hou.com — 紫微垣研究院 · 其厚能源 官网共享样式
   ============================================================ */
:root{
  --brand:#0095D9;          /* 品牌科技蓝 */
  --brand-dark:#0072A8;
  --brand-deep:#0B3A5C;
  --ink:#1a2733;
  --ink2:#44525f;
  --muted:#6b7a88;
  --bg:#ffffff;
  --bg2:#f3f7fb;
  --bg3:#eaf3fb;
  --line:#e3ecf3;
  --hero-grad:linear-gradient(135deg,#0B3A5C 0%,#0f5a8a 55%,#0095D9 120%);
  --shadow:0 8px 30px rgba(11,58,92,.10);
  --shadow-lg:0 18px 50px rgba(11,58,92,.16);
  --radius:14px;
  --maxw:1200px;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC","WenQuanYi Micro Hei",-apple-system,"Segoe UI",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
mark.key{background:none;color:var(--brand);font-weight:600}

/* ---------- 顶部导航 ---------- */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.50);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:44px;width:auto}
.brand-name{display:flex;flex-direction:column;line-height:1.15}
.brand-name b{font-size:19px;color:var(--brand-deep);letter-spacing:.5px}
.brand-name small{font-size:11px;color:var(--muted);letter-spacing:2px}
.nav{display:flex;align-items:center;gap:6px}
.nav a{padding:10px 16px;font-size:15px;font-weight:500;color:var(--ink2);border-radius:8px;transition:.2s;position:relative}
.nav a:hover{color:var(--brand)}
.nav a.active{color:var(--brand)}
.nav a.active::after{content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;background:var(--brand);border-radius:2px}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;width:42px;height:42px;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--brand-deep);border-radius:2px;transition:.3s}

/* ---------- 页头横幅 ---------- */
.page-hero{background:var(--hero-grad);color:#fff;padding:50px 0 64px;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-120px;top:-80px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(0,149,217,.35),transparent 70%)}
.page-hero .crumbs{font-size:13px;opacity:.85;margin-bottom:14px;position:relative;z-index:1}
.page-hero .crumbs a:hover{text-decoration:underline}
.page-hero h1{font-size:40px;font-weight:800;letter-spacing:1px;position:relative;z-index:1}
.page-hero p{font-size:17px;opacity:.92;margin-top:12px;max-width:760px;position:relative;z-index:1}

/* ---------- 区块 ---------- */
.section{padding:50px 0}
.section.bg{background:var(--bg2)}
.section-head{text-align:center;max-width:760px;margin:0 auto 48px}
.section-head .eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:3px;color:var(--brand);text-transform:uppercase;margin-bottom:12px}
.section-head h2{font-size:32px;font-weight:800;color:var(--brand-deep)}
.section-head p{margin-top:14px;color:var(--ink2);font-size:16px}
.section-head .rule{width:56px;height:3px;background:var(--brand);border-radius:3px;margin:18px auto 0}

/* ---------- 首页 Hero ---------- */
.hero{background:var(--hero-grad);color:#fff;position:relative;overflow:hidden;padding:50px 0 110px}
.hero-bg{position:absolute;inset:0;opacity:.16;background:url('../img/hero-platform.jpg') center/cover no-repeat;mix-blend-mode:screen}
.hero .container{position:relative;z-index:2}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);padding:7px 16px;border-radius:30px;font-size:13px;letter-spacing:1px;margin-bottom:22px}
.hero h1{font-size:46px;line-height:1.22;font-weight:800;letter-spacing:1px}
.hero h1 em{font-style:normal;color:#6fd5ff}
.hero p.lead{font-size:17px;opacity:.92;margin:20px 0 30px;max-width:560px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:10px;font-size:15px;font-weight:600;transition:.25s;cursor:pointer;border:none}
.btn-primary{background:#fff;color:var(--brand-dark)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.4)}
.btn-ghost:hover{background:rgba(255,255,255,.22)}
.btn-blue{background:var(--brand);color:#fff}
.btn-blue:hover{background:var(--brand-dark);transform:translateY(-2px)}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:44px}
.hero-stat{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:14px;padding:20px}
.hero-stat b{display:block;font-size:30px;font-weight:800;color:#fff}
.hero-stat span{font-size:13px;opacity:.85}
.hero-visual{border-radius:18px;overflow:hidden;box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.25)}
.hero-visual img{width:100%;height:100%;object-fit:cover}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:24px}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:.3s;box-shadow:0 2px 10px rgba(11,58,92,.04)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(0,149,217,.4)}
.card .icon{width:56px;height:56px;border-radius:14px;background:var(--bg3);display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--brand)}
.card .icon svg{width:28px;height:28px}
.card h3{font-size:19px;font-weight:700;color:var(--brand-deep);margin-bottom:10px}
.card p{font-size:14.5px;color:var(--ink2)}
.card.dark{background:var(--brand-deep);border-color:transparent;color:#fff}
.card.dark h3{color:#fff}
.card.dark p{color:rgba(255,255,255,.85)}
.card.dark .icon{background:rgba(255,255,255,.14);color:#fff}

/* ---------- 产品卡片 ---------- */
.product-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;transition:.3s;display:flex;flex-direction:column}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.product-card .thumb{height:210px;overflow:hidden;background:var(--bg2);display:flex;align-items:center;justify-content:center}
.product-card .thumb img{width:100%;height:100%;object-fit:cover}
.product-card .body{padding:22px 24px 26px;display:flex;flex-direction:column;flex:1}
.product-card .tag{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:1px;margin-bottom:8px}
.product-card h3{font-size:19px;font-weight:700;color:var(--brand-deep);margin-bottom:8px}
.product-card p{font-size:14px;color:var(--ink2);flex:1}
.product-card .model{margin-top:14px;font-family:monospace;font-size:12.5px;color:var(--muted);background:var(--bg2);padding:6px 10px;border-radius:6px;display:inline-block}

/* ---------- 特性列表 ---------- */
.feature-list li{display:flex;gap:10px;align-items:flex-start;padding:7px 0;font-size:14.5px;color:var(--ink2)}
.feature-list li::before{content:"✓";color:var(--brand);font-weight:700;flex-shrink:0}

/* ---------- 步骤/流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:step}
.step{position:relative;text-align:center;padding:30px 18px;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius)}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-size:34px;font-weight:800;color:var(--bg3)}
.step h4{margin:12px 0 8px;font-size:17px;color:var(--brand-deep)}
.step p{font-size:13.5px;color:var(--ink2)}

/* ---------- 案例 ---------- */
.case-card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;transition:.3s;display:flex;flex-direction:column}
.case-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.case-card .thumb{height:200px;overflow:hidden}
.case-card .thumb img{width:100%;height:100%;object-fit:cover;transition:.5s}
.case-card:hover .thumb img{transform:scale(1.06)}
.case-card .body{padding:22px 24px}
.case-card .body h3{font-size:18px;font-weight:700;color:var(--brand-deep);margin-bottom:8px}
.case-card .body p{font-size:14px;color:var(--ink2)}
.case-card .meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.case-card .meta span{font-size:12px;background:var(--bg3);color:var(--brand-dark);padding:4px 10px;border-radius:20px;font-weight:600}

/* ---------- 联系方式 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;gap:16px;align-items:flex-start}
.contact-card .icon{width:48px;height:48px;border-radius:12px;background:var(--bg3);color:var(--brand);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.contact-card .icon svg{width:24px;height:24px}
.contact-card h4{font-size:15px;color:var(--muted);font-weight:600;margin-bottom:4px}
.contact-card p{font-size:16px;color:var(--brand-deep);font-weight:600}
.contact-card small{font-size:13px;color:var(--ink2)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--brand-deep);color:rgba(255,255,255,.82);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px}
.footer-brand img{height:52px;width:auto;margin-bottom:18px}
.footer-brand p{font-size:13.5px;line-height:1.8;opacity:.85}
.footer-col h5{color:#fff;font-size:15px;font-weight:700;margin-bottom:18px;letter-spacing:1px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{font-size:14px;opacity:.85;transition:.2s}
.footer-col ul a:hover{opacity:1;color:#6fd5ff}
.footer-contact li{display:flex;gap:10px;font-size:14px;margin-bottom:12px;align-items:flex-start}
.footer-contact svg{width:18px;height:18px;flex-shrink:0;margin-top:3px;color:#6fd5ff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding:20px 0 8px;text-align:center;font-size:13px;opacity:.7}
.beian{text-align:center;font-size:12.5px;opacity:.6;padding:0 0 22px}
.beian a{color:#6fd5ff;text-decoration:underline}
.beian a:hover{opacity:1}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .grid.cols-4{grid-template-columns:repeat(2,1fr)}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero h1{font-size:36px}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .nav{position:fixed;top:74px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;padding:14px 20px 22px;box-shadow:var(--shadow);gap:4px;transform:translateY(-130%);transition:.3s;opacity:0;pointer-events:none}
  .nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav a{padding:13px 12px;font-size:16px}
  .page-hero h1{font-size:30px}
  .section{padding:56px 0}
  .section-head h2{font-size:26px}
  .grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .hero{padding:64px 0 72px}
  .hero h1{font-size:30px}
  .hero-stats{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-brand img{filter:none}
}
@media (max-width:420px){
  .hero-stats{grid-template-columns:1fr}
  .brand img{height:38px}
  .brand-name b{font-size:16px}
}