:root {
  --bg: #f6f8fb;
  --text: #172033;
  --muted: #667085;
  --line: rgba(23, 32, 51, 0.1);
  --primary: #b91c1c;
  --primary-dark: #7f1d1d;
  --ink: #0f172a;
  --white: #ffffff;
  --card: rgba(255, 255, 255, 0.88);
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; min-width: 230px; }
.brand-mark {
  width: 46px; height: 46px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--ink));
  color: #fff; border-radius: 14px; font-weight: 800; letter-spacing: .5px;
  box-shadow: 0 10px 25px rgba(185, 28, 28, .22);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 20px; letter-spacing: .15em; }
.brand-text em { font-style: normal; font-size: 12px; color: var(--muted); margin-top: 3px; }
.nav { display: flex; gap: 24px; color: #344054; font-size: 15px; }
.nav a:hover, .footer-grid a:hover { color: var(--primary); }
.nav-cta { padding: 10px 18px; border-radius: 999px; color: #fff; background: var(--primary); font-weight: 700; }

.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}
.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  border-radius: 999px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}
.site-header.menu-open .mobile-menu-btn span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-header.menu-open .mobile-menu-btn span:nth-child(2) { opacity: 0; }
.site-header.menu-open .mobile-menu-btn span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  top: 76px;
  z-index: 29;
  padding: 12px 20px 20px;
  background: rgba(255,255,255,.98);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 20px 40px rgba(15,23,42,.08);
}
.mobile-menu a {
  display: block;
  padding: 13px 4px;
  color: #344054;
  font-weight: 800;
  border-bottom: 1px solid rgba(23,32,51,.08);
}
.mobile-menu .mobile-menu-cta {
  margin-top: 14px;
  padding: 13px 18px;
  text-align: center;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 999px;
  border-bottom: 0;
}
body.menu-locked { overflow: hidden; }

.hero { position: relative; overflow: hidden; padding: 96px 0 86px; background:
  radial-gradient(circle at 12% 18%, rgba(185,28,28,.15), transparent 28%),
  linear-gradient(135deg, #fff 0%, #f7f2f2 48%, #eef2f7 100%);
}
.hero::after { content: ""; position: absolute; inset: auto -120px -220px auto; width: 520px; height: 520px; background: rgba(185,28,28,.08); border-radius: 50%; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 56px; }
.eyebrow, .section-label { margin: 0 0 14px; color: var(--primary); font-weight: 800; letter-spacing: .16em; font-size: 13px; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(42px, 6vw, 72px); line-height: 1.08; letter-spacing: -.045em; margin-bottom: 24px; color: var(--ink); }
h1 span { color: var(--primary); }
.hero-desc { font-size: 18px; color: #475467; max-width: 680px; }
.hero-actions { display: flex; gap: 14px; margin: 34px 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 24px; border-radius: 999px; font-weight: 800; border: 1px solid transparent; cursor: pointer; }
.btn.primary { color: #fff; background: linear-gradient(135deg, var(--primary), var(--primary-dark)); box-shadow: 0 18px 35px rgba(185, 28, 28, .2); }
.btn.secondary { background: #fff; border-color: var(--line); color: var(--ink); }
.hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; max-width: 630px; }
.hero-stats div { padding: 18px; background: rgba(255,255,255,.72); border: 1px solid var(--line); border-radius: 18px; }
.hero-stats strong { display: block; color: var(--primary); font-size: 28px; line-height: 1.1; }
.hero-stats span { display: block; margin-top: 6px; color: var(--muted); font-size: 14px; }
.hero-card { min-height: 520px; padding: 28px; border-radius: 34px; background: linear-gradient(160deg, #101828 0%, #1f2937 55%, #7f1d1d 100%); box-shadow: var(--shadow); color: #fff; position: relative; overflow: hidden; }
.hero-card::before { content: ""; position: absolute; inset: 80px -80px auto auto; width: 260px; height: 260px; border: 1px solid rgba(255,255,255,.18); border-radius: 50%; }
.card-top, .card-bottom { position: relative; z-index: 2; }
.card-top span { color: rgba(255,255,255,.6); font-size: 12px; letter-spacing: .18em; }
.card-top b { display: block; font-size: 30px; margin-top: 8px; }
.product-stack { position: absolute; inset: 130px 30px 90px; }
.roll { position: absolute; border-radius: 999px; background: #fff; box-shadow: 0 22px 50px rgba(0,0,0,.25); }
.roll::after { content: ""; position: absolute; inset: 22%; border-radius: 50%; background: #e5e7eb; box-shadow: inset 0 0 0 12px #fff; }
.roll-a { width: 210px; height: 210px; left: 18px; top: 24px; }
.roll-b { width: 165px; height: 165px; right: 20px; top: 84px; background: #f3f4f6; }
.sheet { position: absolute; border-radius: 16px; background: #fff; transform: rotate(-10deg); box-shadow: 0 18px 45px rgba(0,0,0,.26); }
.sheet::before { content:""; position:absolute; inset:20px; background: repeating-linear-gradient(180deg, #e5e7eb 0 8px, transparent 8px 24px); border-radius:10px; }
.sheet-a { width: 250px; height: 140px; right: 50px; bottom: 56px; }
.sheet-b { width: 220px; height: 116px; left: 80px; bottom: 22px; transform: rotate(8deg); opacity: .92; }
.card-bottom { position: absolute; left: 28px; right: 28px; bottom: 24px; border-top: 1px solid rgba(255,255,255,.2); padding-top: 18px; color: rgba(255,255,255,.72); }
.section { padding: 92px 0; }
.split { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; }
h2 { font-size: clamp(32px, 4vw, 48px); line-height: 1.18; letter-spacing: -.035em; color: var(--ink); margin-bottom: 18px; }
.text-block { color: #475467; font-size: 17px; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 44px; }
.section-head p:last-child { color: var(--muted); font-size: 17px; }
.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-item { background: var(--white); padding: 30px; border-radius: 24px; border: 1px solid var(--line); box-shadow: 0 16px 45px rgba(15,23,42,.06); transition: transform .2s ease, box-shadow .2s ease; }
.product-item:hover { transform: translateY(-4px); box-shadow: 0 22px 55px rgba(15,23,42,.1); }
.product-item span { display: inline-flex; width: 42px; height: 42px; align-items: center; justify-content: center; border-radius: 12px; color: var(--primary); background: rgba(185,28,28,.08); font-weight: 800; margin-bottom: 18px; }
.product-item h3 { font-size: 22px; margin-bottom: 10px; }
.product-item p { color: var(--muted); margin-bottom: 0; }
.advantages { background: #111827; color: #fff; }
.advantages h2, .section-head.light h2 { color: #fff; }
.section-head.light p:last-child { color: rgba(255,255,255,.68); }
.advantage-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.advantage-card { padding: 30px; border-radius: 26px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12); }
.advantage-card strong { color: #fecaca; font-size: 38px; line-height: 1; }
.advantage-card h3 { margin: 18px 0 10px; font-size: 21px; }
.advantage-card p { color: rgba(255,255,255,.68); margin-bottom: 0; }
.custom-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; align-items: center; }
.lead { color: var(--muted); font-size: 18px; margin-bottom: 28px; }
.steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.steps div { padding: 26px; background: #fff; border-radius: 24px; border: 1px solid var(--line); }
.steps b { color: var(--primary); font-size: 22px; }
.steps span { display: block; font-size: 21px; font-weight: 800; margin: 8px 0; }
.steps p { margin-bottom: 0; color: var(--muted); }
.warehouse { padding-top: 0; }
.warehouse-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; padding: 48px; border-radius: 34px; background: linear-gradient(135deg, #fff, #fef2f2); border: 1px solid var(--line); box-shadow: var(--shadow); }
.warehouse-panel p { color: var(--muted); }
.warehouse-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; align-content: center; }
.warehouse-list span { padding: 16px 20px; border-radius: 16px; background: #fff; border: 1px solid rgba(185,28,28,.12); font-weight: 800; color: var(--primary-dark); }
.contact { background: #fff; }
.contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: start; }
.contact-info { margin-top: 28px; padding: 24px; border-radius: 22px; background: #f9fafb; border: 1px solid var(--line); }
.contact-info p { margin: 8px 0; color: #475467; }
.contact-form { padding: 32px; border-radius: 28px; background: #f9fafb; border: 1px solid var(--line); box-shadow: 0 18px 45px rgba(15,23,42,.06); }
.contact-form label { display: block; margin-bottom: 16px; color: #344054; font-weight: 800; }
input, select, textarea { width: 100%; margin-top: 8px; padding: 14px 15px; border: 1px solid #d0d5dd; border-radius: 14px; font: inherit; outline: none; background: #fff; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(185,28,28,.1); }
.form-note { font-size: 13px; color: var(--muted); margin: 14px 0 0; }
.site-footer { background: #0b1220; color: #fff; padding: 34px 0 22px; }
.footer-grid { display: flex; justify-content: space-between; gap: 24px; align-items: center; }
.footer-grid p { color: rgba(255,255,255,.58); margin-bottom: 0; }
.footer-grid div:last-child { display: flex; gap: 20px; color: rgba(255,255,255,.72); }
.copyright { text-align: center; color: rgba(255,255,255,.42); font-size: 13px; margin: 24px 0 0; }
@media (max-width: 980px) {
  .nav { display: none; }
  .hero-grid, .split, .custom-grid, .warehouse-panel, .contact-grid { grid-template-columns: 1fr; }
  .hero-card { min-height: 430px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .container { width: min(100% - 28px, 1180px); }
  .nav-cta { display: none; }
  .brand { min-width: auto; }
  .hero { padding: 70px 0 60px; }
  .hero-stats, .product-grid, .advantage-grid, .steps, .warehouse-list { grid-template-columns: 1fr; }
  .section { padding: 64px 0; }
  .warehouse-panel, .contact-form { padding: 24px; }
  .footer-grid { flex-direction: column; align-items: flex-start; }
}

.contact-info a { color: var(--primary); font-weight: 800; text-decoration: none; }
.contact-card h3 { margin: 0 0 14px; font-size: 24px; }
.contact-card p { color: #475467; line-height: 1.8; }
.full-btn { width: 100%; justify-content: center; margin: 18px 0; }
.wecom-card {
  padding: 36px;
  border-radius: 28px;
  background: linear-gradient(135deg, #fff, #fef2f2);
  border: 1px solid var(--line);
  box-shadow: 0 18px 45px rgba(15,23,42,.06);
}
.card-badge {
  display: inline-flex;
  margin-bottom: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(185,28,28,.08);
  color: var(--primary);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
}
.wecom-card .form-note a { color: var(--primary); font-weight: 800; }
@media (max-width: 640px) {
  .wecom-card { padding: 24px; }
}


/* 完整手机端自适应 */
@media (max-width: 1080px) {
  .nav { gap: 16px; font-size: 14px; }
  .brand { min-width: 210px; }
  .hero-grid { gap: 36px; }
}
@media (max-width: 980px) {
  .site-header { position: sticky; }
  .nav, .nav-cta { display: none; }
  .mobile-menu-btn { display: inline-flex; }
  .site-header.menu-open .mobile-menu { display: block; }
  .nav-wrap { height: 68px; }
  .mobile-menu { top: 68px; }
  .hero-grid, .split, .custom-grid, .warehouse-panel, .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 64px; }
  .hero-card { min-height: 390px; }
  .product-stack { transform: scale(.82); transform-origin: center; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .split, .custom-grid, .contact-grid { gap: 34px; }
  .warehouse-panel { gap: 28px; }
}
@media (max-width: 720px) {
  .container { width: min(100% - 28px, 1180px); }
  .brand-mark { width: 40px; height: 40px; border-radius: 12px; }
  .brand-text strong { font-size: 18px; }
  .brand-text em { font-size: 11px; }
  h1 { font-size: clamp(38px, 12vw, 54px); line-height: 1.12; }
  h2 { font-size: clamp(28px, 8vw, 38px); }
  .hero-desc, .lead, .section-head p:last-child { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: stretch; margin: 26px 0; }
  .btn { width: 100%; min-height: 48px; }
  .hero-stats, .product-grid, .advantage-grid, .steps, .warehouse-list { grid-template-columns: 1fr; }
  .hero-stats div, .product-item, .advantage-card, .steps div { padding: 22px; border-radius: 20px; }
  .hero-card { min-height: 320px; padding: 22px; border-radius: 24px; }
  .card-top b { font-size: 24px; }
  .product-stack { inset: 88px 0 70px; transform: scale(.65); }
  .card-bottom { left: 22px; right: 22px; bottom: 18px; padding-top: 12px; font-size: 13px; }
  .section { padding: 58px 0; }
  .section-head { margin-bottom: 30px; text-align: left; }
  .warehouse-panel, .contact-form, .wecom-card { padding: 22px; border-radius: 24px; }
  .contact-info { padding: 20px; }
  .footer-grid { flex-direction: column; align-items: flex-start; }
  .footer-grid div:last-child { flex-wrap: wrap; gap: 12px 18px; }
}
@media (max-width: 430px) {
  .container { width: min(100% - 22px, 1180px); }
  .nav-wrap { height: 62px; }
  .mobile-menu { top: 62px; padding-left: 14px; padding-right: 14px; }
  .brand { gap: 9px; min-width: 0; }
  .brand-mark { width: 36px; height: 36px; font-size: 13px; }
  .brand-text strong { font-size: 17px; letter-spacing: .1em; }
  .brand-text em { max-width: 190px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .mobile-menu-btn { width: 40px; height: 40px; border-radius: 10px; }
  .hero { padding: 52px 0 48px; }
  .eyebrow, .section-label { font-size: 12px; letter-spacing: .12em; }
  h1 { font-size: 36px; letter-spacing: -.03em; }
  .hero-card { min-height: 280px; }
  .product-stack { transform: scale(.55); inset: 72px -14px 62px; }
  .hero-stats strong, .advantage-card strong { font-size: 30px; }
  .product-item h3, .steps span { font-size: 20px; }
  .warehouse-list span { padding: 14px 16px; }
  .site-footer { padding: 30px 0 18px; }
}