/* ============================================================
   折叠床源头工厂官网 - 全站样式
   Industrial minimal style · B2B factory site
   ============================================================ */

:root {
  --c-dark: #1c2128;
  --c-dark-2: #2b313a;
  --c-text: #2f343b;
  --c-text-2: #6b7280;
  --c-accent: #d9690f;      /* 工业橙 */
  --c-accent-dark: #b85609;
  --c-bg: #ffffff;
  --c-bg-alt: #f4f5f7;
  --c-border: #e4e6ea;
  --c-ok: #2e7d32;
  --radius: 4px;
  --shadow: 0 2px 8px rgba(28, 33, 40, .08);
  --container: 1180px;
  --header-h: 64px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 顶部公告条 ---------- */
.topbar {
  background: var(--c-dark);
  color: #cfd4da;
  font-size: 13px;
  line-height: 36px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.topbar a { color: #fff; }
.topbar a:hover { color: var(--c-accent); }
.topbar-right { display: flex; align-items: center; gap: 18px; }

/* 语言切换 */
.lang-switch { display: flex; gap: 0; }
.lang-switch button {
  background: transparent;
  border: 1px solid #3a4048;
  color: #cfd4da;
  font-size: 12px;
  padding: 3px 10px;
  cursor: pointer;
  line-height: 1.5;
}
.lang-switch button:first-child { border-right: 0; }
.lang-switch button.active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: #fff;
}

/* ---------- 导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--c-border);
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: .5px;
  color: var(--c-dark);
}
.logo-mark {
  width: 34px; height: 34px;
  background: var(--c-dark);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; font-weight: 700;
  border-radius: var(--radius);
  flex-shrink: 0;
}
.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-text b {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--c-dark);
}
.logo-text small {
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: .2px;
  color: var(--c-text-2);
  margin-top: 2px;
  white-space: nowrap;
}
.logo em { color: var(--c-accent); font-style: normal; }

.main-nav ul { display: flex; gap: 6px; }
.main-nav a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--c-text);
  border-radius: var(--radius);
  transition: color .15s, background .15s;
}
.main-nav a:hover { color: var(--c-accent); }
.main-nav a.active { color: var(--c-accent); font-weight: 600; }

.nav-cta {
  background: var(--c-accent);
  color: #fff !important;
  font-weight: 600;
}
.nav-cta:hover { background: var(--c-accent-dark) !important; color: #fff !important; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  width: 42px; height: 38px;
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 10px; right: 10px;
  height: 2px;
  background: var(--c-dark);
}
.nav-toggle span { top: 50%; margin-top: -1px; }
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }

/* ---------- 首屏 Hero ---------- */
.hero {
  position: relative;
  min-height: 560px;
  display: flex;
  align-items: center;
  color: #fff;
  background: var(--c-dark) url("../images/hero-banner.jpg") center/cover no-repeat;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(20,24,30,.88) 0%, rgba(20,24,30,.62) 55%, rgba(20,24,30,.35) 100%);
}
.hero .container { position: relative; padding-top: 70px; padding-bottom: 70px; }
.hero-tag {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.4);
  padding: 4px 14px;
  font-size: 13px;
  letter-spacing: 2px;
  margin-bottom: 22px;
  color: #f0c9a0;
}
.hero-company {
  font-size: clamp(17px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
  padding-left: 14px;
  border-left: 3px solid var(--c-accent);
  margin-bottom: 16px;
}
.hero-company + h1 { margin-top: 0; }

.hero h1 {
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.25;
  font-weight: 800;
  max-width: 720px;
  margin-bottom: 18px;
}
.hero p.sub {
  font-size: clamp(15px, 2vw, 19px);
  color: #d5d9df;
  max-width: 620px;
  margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 30px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: var(--c-accent-dark); }
.btn-ghost { border-color: rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.12); }
.btn-dark { background: var(--c-dark); color: #fff; }
.btn-dark:hover { background: var(--c-dark-2); }

/* Hero 数据条 */
.hero-stats {
  display: flex;
  gap: 0;
  margin-top: 56px;
  border-top: 1px solid rgba(255,255,255,.18);
  padding-top: 28px;
  flex-wrap: wrap;
}
.hero-stats .stat { padding-right: 48px; margin-right: 48px; border-right: 1px solid rgba(255,255,255,.18); }
.hero-stats .stat:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.stat b { display: block; font-size: 30px; font-weight: 800; color: #fff; }
.stat span { font-size: 13px; color: #b9bec6; }

/* ---------- 区块通用 ---------- */
.section { padding: 76px 0; }
.section.alt { background: var(--c-bg-alt); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head .kicker {
  color: var(--c-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(24px, 3.4vw, 34px);
  color: var(--c-dark);
  line-height: 1.3;
  margin-bottom: 12px;
}
.section-head p { color: var(--c-text-2); }

/* ---------- 卖点卡片 ---------- */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; align-items: center; }

.feature-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-dark);
  border-radius: var(--radius);
  padding: 30px 26px;
  transition: box-shadow .2s, transform .2s;
}
.feature-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.feature-card .icon {
  width: 46px; height: 46px;
  background: var(--c-bg-alt);
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 18px;
  color: var(--c-accent);
}
.feature-card h3 { font-size: 17px; color: var(--c-dark); margin-bottom: 8px; }
.feature-card p { font-size: 14px; color: var(--c-text-2); }

/* ---------- 产品卡片 ---------- */
.product-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s, transform .2s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.product-card .thumb { aspect-ratio: 4/3; overflow: hidden; background: var(--c-bg-alt); }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-card .body { padding: 22px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 18px; color: var(--c-dark); margin-bottom: 6px; }
.product-card .model {
  font-size: 12px; color: var(--c-text-2);
  letter-spacing: 1px; margin-bottom: 12px;
}
.product-card p { font-size: 14px; color: var(--c-text-2); flex: 1; }
.product-card .link {
  margin-top: 16px;
  color: var(--c-accent);
  font-weight: 600;
  font-size: 14px;
}
.product-card .link:hover { text-decoration: underline; }

/* ---------- 车间展示 ---------- */
.workshop-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.workshop-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  aspect-ratio: 3/4;
  background: var(--c-dark);
}
.workshop-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .3s;
}
.workshop-item:hover img { transform: scale(1.04); }
.workshop-item .label {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 40px 16px 14px;
  background: linear-gradient(transparent, rgba(15,18,23,.85));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
}
.workshop-item .label small {
  display: block;
  font-weight: 400;
  font-size: 12px;
  color: #c2c7ce;
}

/* ---------- 步骤/流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.flow-item {
  text-align: center;
  padding: 10px 22px;
  position: relative;
}
.flow-item::before {
  counter-increment: step;
  content: "0" counter(step);
  display: block;
  font-size: 34px;
  font-weight: 800;
  color: var(--c-accent);
  opacity: .9;
  margin-bottom: 8px;
}
.flow-item h3 { font-size: 16px; color: var(--c-dark); margin-bottom: 6px; }
.flow-item p { font-size: 13px; color: var(--c-text-2); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  background: var(--c-dark) url("../images/warehouse.jpg") center/cover no-repeat;
  position: relative;
  color: #fff;
  padding: 70px 0;
}
.cta-band::before { content: ""; position: absolute; inset: 0; background: rgba(20,24,30,.82); }
.cta-band .container { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-band h2 { font-size: clamp(22px, 3vw, 30px); margin-bottom: 8px; }
.cta-band p { color: #c9cdd3; }

/* ---------- 数据板块 ---------- */
.stat-band { background: var(--c-dark); color: #fff; padding: 56px 0; }
.stat-band .grid-4 { gap: 30px; }
.stat-band .stat { text-align: center; border-right: 1px solid #333a44; }
.stat-band .stat:last-child { border-right: 0; }
.stat-band b { display: block; font-size: 38px; font-weight: 800; color: var(--c-accent); }
.stat-band span { font-size: 14px; color: #b9bec6; }

/* ---------- 产品详情页 ---------- */
.product-hero { background: var(--c-bg-alt); padding: 48px 0; }
.breadcrumb { font-size: 13px; color: var(--c-text-2); margin-bottom: 20px; }
.breadcrumb a:hover { color: var(--c-accent); }
.product-detail { display: grid; grid-template-columns: 1.05fr 1fr; gap: 44px; align-items: start; }
.product-detail .pic {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}
.product-detail h1 { font-size: clamp(24px, 3vw, 32px); color: var(--c-dark); margin-bottom: 6px; }
.product-detail .model { color: var(--c-text-2); font-size: 13px; letter-spacing: 1px; margin-bottom: 16px; }
.product-detail .desc { color: var(--c-text-2); margin-bottom: 24px; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin-bottom: 26px;
}
.spec-table th, .spec-table td {
  border: 1px solid var(--c-border);
  padding: 10px 14px;
  text-align: left;
}
.spec-table th {
  background: var(--c-bg-alt);
  color: var(--c-dark);
  width: 38%;
  font-weight: 600;
}
.spec-table tr:hover td { background: #fafbfc; }

.tag-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 26px; }
.tag {
  font-size: 12px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-alt);
  color: var(--c-text-2);
  padding: 4px 12px;
  border-radius: 999px;
}

/* ---------- 表单 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 44px; align-items: start; }
.info-list li {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--c-border);
  font-size: 15px;
}
.info-list .icon { color: var(--c-accent); flex-shrink: 0; margin-top: 3px; }
.info-list b { display: block; color: var(--c-dark); font-size: 14px; margin-bottom: 2px; }
.info-list span { color: var(--c-text-2); }

.contact-form {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--c-dark); margin-bottom: 6px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--c-text);
  background: #fff;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-accent);
}
.form-group textarea { min-height: 110px; resize: vertical; }
.form-tip { font-size: 12px; color: var(--c-text-2); margin-top: 10px; }
.form-status { margin-top: 14px; font-size: 14px; color: var(--c-ok); display: none; }
.form-status.error { color: #c0392b; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-dark); color: #9aa1aa; padding: 56px 0 0; font-size: 14px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 40px;
}
.footer-grid h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-grid a { display: block; padding: 4px 0; color: #9aa1aa; }
.footer-grid a:hover { color: var(--c-accent); }
.footer-bottom {
  border-top: 1px solid #2c333c;
  padding: 18px 0;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 13px;
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 22px; bottom: 26px;
  width: 42px; height: 42px;
  background: var(--c-dark);
  color: #fff;
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 18px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  z-index: 90;
}
.back-top.show { opacity: .85; pointer-events: auto; }
.back-top:hover { opacity: 1; }

/* ---------- 动画（轻量，仅淡入） ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .workshop-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); row-gap: 28px; }
  .product-detail, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .topbar .container { justify-content: center; }
  .topbar-right .lang-wrap-text { display: none; }

  .nav-toggle { display: block; }
  .main-nav {
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--c-border);
    display: none;
    box-shadow: 0 8px 16px rgba(0,0,0,.08);
  }
  .main-nav.open { display: block; }
  .main-nav ul { flex-direction: column; gap: 0; padding: 8px 0; }
  .main-nav a { padding: 13px 24px; border-radius: 0; }

  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .workshop-grid { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .hero-stats { gap: 20px; }
  .hero-stats .stat { border-right: 0; padding-right: 0; margin-right: 0; min-width: 40%; }
  .form-row { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .cta-band .container { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .workshop-grid { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}