/* =========================================================
   电子商务商城单页 —— 独立响应式 CSS
   配色：品牌橙红 #FF5B2E / 深蓝 #0E1726（电商科技风）
   ========================================================= */

:root{
  --orange:#FF5B2E;
  --orange2:#FF7A45;
  --ink:#1a2233;
  --gray:#5b6472;
  --gray-l:#8b94a3;
  --bg:#f6f7fb;
  --line:rgba(255,91,46,0.12);
  --dark:#0E1726;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,"Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;}
a{color:var(--orange);text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%;display:block}
.section-inner{max-width:1200px;margin:0 auto;padding:0 24px}

/* ===== HEADER ===== */
.header{position:sticky;top:0;z-index:1000;background:rgba(255,255,255,0.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .3s;}
.header.scrolled{box-shadow:0 4px 24px rgba(255,91,46,0.10);}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:68px;display:flex;align-items:center;justify-content:space-between;}
.nav-brand{display:inline-flex;align-items:center;gap:10px;}
.nav-logo{height:40px;}
.nav-brand-text{font-size:21px;font-weight:900;color:var(--ink);display:flex;align-items:baseline;gap:8px;}
.nav-brand-desc{font-size:12px;color:var(--orange);font-weight:700;}
.nav-menu{display:flex;gap:26px;}
.nav-menu a{font-size:15px;font-weight:500;color:var(--gray);transition:color .2s;position:relative;padding:6px 0;}
.nav-menu a:hover{color:var(--orange);}
.nav-menu a::after{content:'';position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--orange);transition:width .25s;}
.nav-menu a:hover::after{width:100%;}
.nav-cta{background:var(--orange);color:#fff;font-size:14px;font-weight:600;padding:10px 22px;border-radius:8px;transition:background .2s;}
.nav-cta:hover{background:var(--orange2);color:#fff;}
.nav-toggle{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--ink);}

/* ===== HERO ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#2a1500 0%,#431a00 60%,var(--orange) 140%);color:#fff;padding:84px 0 92px;}
.hero-bg{position:absolute;inset:0;background:
    radial-gradient(circle at 85% 20%,rgba(255,122,69,0.35) 0%,transparent 45%),
    radial-gradient(circle at 10% 90%,rgba(255,122,69,0.18) 0%,transparent 40%);pointer-events:none;}
.hero-inner{position:relative;max-width:1200px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.05fr 0.95fr;gap:48px;align-items:center;}
.hero-tag{display:inline-block;font-size:13px;font-weight:700;color:var(--orange);background:#fff;padding:5px 14px;border-radius:30px;margin-bottom:20px;letter-spacing:1px;}
.hero-text h1{font-size:48px;font-weight:900;line-height:1.2;margin-bottom:20px;}
.hero-sub{font-size:18px;color:#ffd9cc;font-weight:500;margin-bottom:18px;}
.hero-desc{font-size:15px;color:rgba(255,255,255,0.78);line-height:1.95;margin-bottom:32px;max-width:560px;}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap;}
.btn-primary{background:#fff;color:var(--orange);font-size:16px;font-weight:700;padding:14px 32px;border-radius:10px;display:inline-flex;align-items:center;gap:8px;transition:all .2s;box-shadow:0 6px 20px rgba(0,0,0,0.2);}
.btn-primary:hover{transform:translateY(-2px);color:var(--orange);}
.btn-secondary{background:rgba(255,255,255,0.1);color:#fff;font-size:16px;font-weight:600;padding:14px 32px;border-radius:10px;border:1px solid rgba(255,255,255,0.35);display:inline-flex;align-items:center;gap:8px;transition:all .2s;}
.btn-secondary:hover{background:rgba(255,255,255,0.2);color:#fff;}
.hero-visual{display:flex;justify-content:center;}
.hero-visual img{max-width:460px;border-radius:14px;filter:drop-shadow(0 20px 50px rgba(0,0,0,0.35));}

/* ===== SECTION ===== */
.section{padding:84px 0;}
.section-alt{background:#fff;}
.section-dark{background:linear-gradient(135deg,var(--dark) 0%,#1a2740 100%);color:#fff;}
.section-head{max-width:760px;margin:0 auto 52px;text-align:center;}
.section-tag{display:inline-block;font-size:13px;font-weight:700;color:var(--orange);letter-spacing:3px;text-transform:uppercase;margin-bottom:12px;}
.section-dark .section-tag{color:#ffb199;}
.section-title{font-size:32px;font-weight:900;line-height:1.35;margin-bottom:16px;}
.section-title.left{text-align:left;margin-bottom:24px;}
.section-dark .section-title{color:#fff;}
.section-head .section-title{font-size:28px;}

/* ===== FUNC GRID ===== */
.func-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.func-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 22px;text-align:center;box-shadow:0 2px 14px rgba(255,91,46,0.05);transition:transform .25s,box-shadow .25s,border-color .25s;}
.func-card:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(255,91,46,0.16);border-color:var(--orange);}
.func-ico{width:72px;height:72px;margin:0 auto 16px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#fff3ee,#ffe6dc);border-radius:18px;}
.func-ico img{width:46px;height:46px;object-fit:contain;}
.func-card h4{font-size:18px;font-weight:700;color:var(--ink);}

/* ===== TECH ===== */
.tech-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:48px;align-items:center;}
.tech-img img{border-radius:16px;box-shadow:0 14px 34px rgba(255,91,46,0.14);width:100%;}
.tech-sub{font-size:22px;font-weight:900;color:var(--orange);margin:8px 0 20px;}
.tech-list{display:flex;flex-direction:column;gap:16px;}
.tech-item{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;}
.tech-num{flex-shrink:0;width:38px;height:38px;border-radius:50%;background:var(--orange);color:#fff;font-weight:700;display:flex;align-items:center;justify-content:center;font-size:14px;}
.tech-item p{font-size:14px;color:var(--gray);line-height:1.85;}

/* ===== ARCH ===== */
.arch-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.arch-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px 24px;box-shadow:0 2px 14px rgba(255,91,46,0.05);transition:transform .25s,box-shadow .25s;}
.arch-card:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(255,91,46,0.14);}
.arch-ico{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,var(--orange),var(--orange2));display:flex;align-items:center;justify-content:center;margin-bottom:14px;}
.arch-ico img{width:28px;height:28px;}
.arch-card h4{font-size:19px;font-weight:700;margin-bottom:10px;color:var(--ink);}
.arch-card p{font-size:14px;color:var(--gray-l);line-height:1.85;}
.arch-banner{margin-top:32px;border-radius:16px;overflow:hidden;box-shadow:0 14px 34px rgba(0,0,0,0.1);}
.arch-banner img{width:100%;}

/* ===== STACK ===== */
.stack-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.stack-card{background:rgba(255,255,255,0.05);border:1px solid rgba(255,255,255,0.12);border-radius:14px;padding:26px 20px;text-align:center;transition:background .25s;}
.stack-card:hover{background:rgba(255,122,69,0.15);}
.stack-card h4{font-size:16px;color:var(--orange);font-weight:700;margin-bottom:10px;}
.stack-card p{font-size:15px;color:rgba(255,255,255,0.82);}
.stack-note{text-align:center;margin-top:26px;font-size:14px;color:rgba(255,255,255,0.6);}

/* ===== CTA ===== */
.cta{background:linear-gradient(135deg,var(--orange) 0%,var(--orange2) 100%);padding:80px 0;position:relative;overflow:hidden;}
.cta::before{content:'';position:absolute;inset:0;background:radial-gradient(circle at 80% 30%,rgba(255,255,255,0.18) 0%,transparent 45%);pointer-events:none;}
.cta-inner{position:relative;max-width:1200px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.4fr 0.6fr;gap:40px;align-items:center;}
.cta-text h2{font-size:34px;font-weight:900;color:#fff;margin-bottom:16px;}
.cta-text p{font-size:16px;color:rgba(255,255,255,0.85);line-height:1.8;margin-bottom:28px;max-width:560px;}
.cta-btns{display:flex;gap:14px;flex-wrap:wrap;}
.cta-btns .btn-primary{background:#fff;color:var(--orange);}
.cta-btns .btn-secondary{background:rgba(255,255,255,0.12);color:#fff;border:1px solid rgba(255,255,255,0.4);}
.cta-qr{background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.18);border-radius:18px;padding:18px;text-align:center;justify-self:center;}
.cta-qr img{width:200px;height:200px;border-radius:12px;}
.cta-qr span{display:block;margin-top:12px;color:rgba(255,255,255,0.7);font-size:13px;}

/* ===== FOOTER ===== */
.footer{background:var(--dark);color:rgba(255,255,255,0.6);padding:60px 0 0;}
.footer-inner{max-width:1200px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:32px;}
.footer-logo{height:40px;margin-bottom:14px;}
.footer-brand{font-size:18px;font-weight:900;color:#fff;margin-bottom:12px;}
.footer-desc{font-size:13px;line-height:1.8;max-width:300px;}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px;font-weight:700;}
.footer-col ul{list-style:none;}
.footer-col li{margin-bottom:10px;}
.footer-col a{font-size:13px;color:rgba(255,255,255,0.6);transition:color .2s;}
.footer-col a:hover{color:var(--orange2);}
.footer-contact p{font-size:13px;line-height:1.9;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);text-align:center;padding:20px 24px;margin-top:48px;font-size:13px;color:rgba(255,255,255,0.45);}

/* ===== RESPONSIVE ===== */
@media(max-width:980px){
  .hero-inner{grid-template-columns:1fr;gap:36px;text-align:center;}
  .hero-visual{order:-1;}
  .hero-text h1{font-size:34px;}
  .hero-sub{font-size:16px;}
  .hero-desc{margin-left:auto;margin-right:auto;}
  .hero-btns{justify-content:center;}
  .hero-visual img{max-width:320px;}
  .func-grid{grid-template-columns:repeat(2,1fr);}
  .tech-grid{grid-template-columns:1fr;gap:32px;}
  .section-title.left{text-align:center;}
  .arch-grid{grid-template-columns:repeat(2,1fr);}
  .stack-grid{grid-template-columns:repeat(2,1fr);}
  .cta-inner{grid-template-columns:1fr;text-align:center;}
  .cta-btns{justify-content:center;}
  .cta-text p{margin-left:auto;margin-right:auto;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .nav-menu{display:none;}
  .nav-toggle{display:block;}
  .nav-menu.open{display:flex;flex-direction:column;position:absolute;top:68px;left:0;right:0;background:#fff;padding:18px 24px;gap:14px;border-bottom:1px solid var(--line);box-shadow:0 8px 24px rgba(0,0,0,0.1);}
}
@media(max-width:600px){
  .hero-text h1{font-size:28px;}
  .section{padding:60px 0;}
  .section-title{font-size:24px;}
  .func-grid{grid-template-columns:1fr;}
  .arch-grid{grid-template-columns:1fr;}
  .stack-grid{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr;}
  .cta-text h2{font-size:26px;}
  .tech-num{width:32px;height:32px;font-size:12px;}
}