/* 红零官网 v2 —— 轻量单文件样式（无框架）
   风格：极简 / 白导航 / 全屏大图首屏 / 灰蓝底 + 品牌红强调 */

:root{
  --brand:#E11D2E;
  --brand-d:#b3151f;
  --ink:#111827;
  --ink-2:#1f2937;
  --muted:#6b7280;
  --line:#e6e9ef;
  --soft:#f5f7fa;
  --deep:#16202c;
  --radius:12px;
  --wrap:1200px;
  --shadow:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06);
  --shadow-lg:0 12px 40px rgba(16,24,40,.12);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink-2);background:#fff;
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{color:var(--ink);line-height:1.3;margin:0 0 .6em;font-weight:700}
p{margin:0 0 1em}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:840px}
.todo{color:#b78a00;background:#fff8e1;border-radius:6px;padding:1px 6px;font-weight:600}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  height:46px;padding:0 22px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap;
}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand-d)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-ghost{border-color:rgba(255,255,255,.6);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14)}
.btn-white{background:#fff;color:var(--brand)}
.btn-white:hover{background:#fff0f1}

/* ---------- 顶栏 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;transition:.25s;
}
.site-header.scrolled{border-bottom-color:var(--line);box-shadow:0 2px 14px rgba(16,24,40,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:10px}
.brand-logo{width:40px;height:40px;display:block;flex:0 0 auto;object-fit:contain}
.brand-mark{
  width:36px;height:36px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#ff5a68);
  color:#fff;font-weight:800;display:grid;place-items:center;font-size:18px;letter-spacing:0;
}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text b{font-size:17px;color:var(--ink);letter-spacing:.5px}
.brand-text i{font-style:normal;font-size:11px;color:var(--muted);letter-spacing:1.5px}
.nav{display:flex;align-items:center;gap:6px}
.nav>a{
  padding:9px 14px;border-radius:8px;font-size:15px;color:var(--ink-2);transition:.18s;
}
.nav>a:hover{color:var(--brand);background:#fdf2f3}
.nav>a.on{color:var(--brand);font-weight:700}
.nav-shop{margin-left:10px;height:40px;padding:0 18px;font-size:14px}
.burger{display:none;width:42px;height:42px;border:0;background:none;cursor:pointer}
.burger span{display:block;width:20px;height:2px;background:var(--ink);margin:4px auto;border-radius:2px;transition:.2s}
.burger.on span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.on span:nth-child(2){opacity:0}
.burger.on span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 首屏 ---------- */
.hero{position:relative;min-height:680px;display:grid;place-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.03)}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(12,20,30,.62),rgba(12,20,30,.5) 45%,rgba(12,20,30,.72));
}
.hero-inner{position:relative;text-align:center;color:#fff;padding-top:72px}
.hero-kicker{
  display:inline-block;font-size:13px;letter-spacing:3px;color:rgba(255,255,255,.85);
  border:1px solid rgba(255,255,255,.35);border-radius:999px;padding:5px 14px;margin-bottom:26px;
}
.hero h1{
  color:#fff;font-size:clamp(34px,5vw,60px);letter-spacing:4px;margin:0 0 18px;
  text-shadow:0 2px 24px rgba(0,0,0,.35);
}
.hero-sub{font-size:clamp(15px,1.6vw,19px);color:rgba(255,255,255,.9);letter-spacing:1.5px;margin-bottom:34px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);width:1px;height:44px;background:rgba(255,255,255,.3)}
.hero-scroll span{position:absolute;left:-2px;top:0;width:5px;height:5px;border-radius:50%;background:#fff;animation:drop 1.8s infinite}
@keyframes drop{0%{transform:translateY(0);opacity:1}100%{transform:translateY(40px);opacity:0}}

/* ---------- 通用区块 ---------- */
.section{padding:88px 0}
.section.alt{background:var(--soft)}
.sec-head{text-align:center;max-width:760px;margin:0 auto 52px}
.sec-head h2{font-size:clamp(24px,2.6vw,32px);letter-spacing:1px;margin-bottom:12px}
.sec-head h2::after{content:"";display:block;width:44px;height:3px;background:var(--brand);border-radius:2px;margin:16px auto 0}
.sec-head p{color:var(--muted);margin:0}
.sec-more{text-align:center;margin-top:44px}
.note{color:var(--muted);font-size:14px;text-align:center;margin-top:34px}

.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:.25s;box-shadow:var(--shadow);
}
a.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#d7dce6}
.step{padding:30px 26px}
.step-no{font-size:26px;font-weight:800;color:var(--brand);opacity:.9;margin-bottom:8px;letter-spacing:1px}
.step h3{font-size:18px;margin-bottom:.4em}
.step p{color:var(--muted);margin:0;font-size:15px}

.cat-img{height:172px;background-size:cover;background-position:center}
.cat-body{padding:22px 22px 24px}
.cat-body h3{font-size:18px;margin-bottom:.4em}
.cat-body p{color:var(--muted);font-size:14.5px;margin:0 0 14px}
.more{color:var(--brand);font-size:14px;font-weight:600}

.post-img{height:186px;background-size:cover;background-position:center}
.post-body{padding:20px 22px 24px}
.post-body h3{font-size:17px;margin:8px 0 .5em}
.post-body p{color:var(--muted);font-size:14.5px;margin:0 0 14px}
.tag{display:inline-block;font-size:12px;color:var(--brand);background:#fdeef0;border-radius:999px;padding:2px 10px}
.meta{color:#9aa3af;font-size:13px}

/* ---------- 图文两栏 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split-media{min-height:380px;border-radius:var(--radius);background-size:cover;background-position:center;box-shadow:var(--shadow)}
.split-text h2{font-size:clamp(22px,2.4vw,30px)}
.split-text p{color:var(--ink-2)}
.split.flip .split-media{order:2}
.stack .split{margin-bottom:80px}
.stack .split:last-child{margin-bottom:0}

.ticks{list-style:none;padding:0;margin:0 0 26px}
.ticks li{position:relative;padding-left:26px;margin-bottom:10px;color:var(--ink-2)}
.ticks li::before{
  content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:2px;
  background:var(--brand);transform:rotate(45deg);
}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(120deg,#c81324,var(--brand) 55%,#f2454f);color:#fff;padding:64px 0}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta h2{color:#fff;margin:0 0 6px;font-size:clamp(22px,2.4vw,30px)}
.cta p{color:rgba(255,255,255,.9);margin:0}

/* ---------- 内页页头 ---------- */
.page-hero{position:relative;background:var(--deep);color:#fff;padding:168px 0 78px;text-align:center;overflow:hidden}
.page-hero-bg{position:absolute;inset:0;background:
  radial-gradient(900px 320px at 50% -10%,rgba(255,255,255,.16),transparent 70%),
  linear-gradient(180deg,#16202c,#22303f)}
.page-hero-inner{position:relative}
.page-hero h1{color:#fff;font-size:clamp(26px,3.4vw,40px);letter-spacing:2px;margin-bottom:.35em}
.page-hero p{color:rgba(255,255,255,.78);margin:0 0 18px}
.crumb{font-size:13px;color:rgba(255,255,255,.6)}
.crumb a{color:rgba(255,255,255,.8)}
.crumb span{margin:0 6px}

/* ---------- 正文 ---------- */
.prose h2{font-size:22px;margin-top:1.8em}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:18px;margin-top:1.5em}
.prose ul{padding-left:20px}
.prose li{margin-bottom:.4em}

.article-cover{height:300px;border-radius:var(--radius);background-size:cover;background-position:center;margin-bottom:40px;box-shadow:var(--shadow)}
.article-foot{display:flex;gap:14px;flex-wrap:wrap;justify-content:space-between;border-top:1px solid var(--line);padding-top:28px;margin-top:40px}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.info-list{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-bottom:36px}
.info-list>div{display:flex;justify-content:space-between;gap:16px;padding:15px 20px;border-bottom:1px solid var(--line)}
.info-list>div:last-child{border-bottom:0}
.info-list>div:nth-child(odd){background:var(--soft)}
.info-list span{color:var(--muted);font-size:14.5px}
.info-list b{text-align:right;color:var(--ink)}
.map-box{border-radius:var(--radius);background:var(--soft);border:1px solid var(--line);height:420px;display:grid;place-items:center}
.map-box.photo{background-size:cover;background-position:center;border:0;box-shadow:var(--shadow)}
.map-inner{color:var(--muted);font-size:14px}

/* ---------- 页脚 ---------- */
.site-footer{background:#0f1722;color:#9aa6b6;padding:64px 0 26px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:44px;padding-bottom:36px;border-bottom:1px solid rgba(255,255,255,.08)}
.f-brand p{margin-top:16px;font-size:14.5px;color:#8a97a8;max-width:380px}
.brand-light .brand-text b{color:#fff}
.brand-light .brand-text i{color:#7d8b9c}
.f-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.f-col a,.f-col p{display:block;font-size:14.5px;color:#9aa6b6;margin:0 0 9px}
.f-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:22px;font-size:13px;color:#7d8b9c}
.site-footer .todo{background:rgba(255,255,255,.08);color:#c9b062}

/* ---------- 动效（默认可见，避免 JS 未执行时内容被隐藏） ---------- */
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.card.in,.sec-head.in,.split.in,.cta-inner.in{animation:rise .6s ease both}
@media (prefers-reduced-motion:reduce){.card.in,.sec-head.in,.split.in,.cta-inner.in{animation:none}}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .split,.contact-grid{grid-template-columns:1fr;gap:32px}
  .split.flip .split-media{order:0}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .section{padding:60px 0}
  .hero{min-height:560px}
  .site-header{background:#fff}
  .burger{display:block}
  .nav{
    position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;
    gap:0;padding:8px 16px 18px;border-bottom:1px solid var(--line);
    box-shadow:0 12px 24px rgba(16,24,40,.08);
    transform:translateY(-140%);transition:.28s ease;visibility:hidden;
  }
  .nav.open{transform:none;visibility:visible}
  .nav>a{padding:14px 10px;border-bottom:1px solid var(--soft)}
  .nav-shop{margin:14px 0 0;height:46px}
  .grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .page-hero{padding:132px 0 56px}
}