/* ============================================================
   Mini Excavators — 小型挖掘机外贸站 设计系统
   主色：工程黄 #F2A900 ｜ 深灰 #141414
   ============================================================ */

:root {
  --c-primary: #F2A900;
  --c-primary-dark: #D18E00;
  --c-primary-soft: #FFF4D6;
  --c-dark: #141414;
  --c-dark-2: #1E1E1E;
  --c-dark-3: #2A2A2A;
  --c-gray: #6B7280;
  --c-gray-light: #9CA3AF;
  --c-light: #F6F6F4;
  --c-white: #FFFFFF;
  --c-border: #E5E5E5;
  --c-success: #17884D;

  --font-head: 'Oswald', 'Arial Narrow', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 30px rgba(0,0,0,.08);
  --shadow-lg: 0 20px 50px rgba(0,0,0,.15);
  --maxw: 1200px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--c-dark);
  background: var(--c-white);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

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; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(20,20,20,.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 600;
  color: var(--c-white);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.logo svg { width: 34px; height: 34px; }
.logo em { color: var(--c-primary); font-style: normal; }

.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
  color: #d1d5db;
  font-size: 14px;
  font-weight: 500;
  transition: color .15s;
}
.nav-links a:hover, .nav-links a.active { color: var(--c-primary); }

.nav-cta {
  background: var(--c-primary);
  color: var(--c-dark);
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 14px;
  transition: background .15s;
}
.nav-cta:hover { background: var(--c-primary-dark); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; }
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--c-white);
  margin: 5px 0; transition: .2s;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all .15s;
  font-family: var(--font-body);
}
.btn-primary { background: var(--c-primary); color: var(--c-dark); }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-outline {
  background: transparent;
  color: var(--c-white);
  border: 2px solid var(--c-white);
}
.btn-outline:hover { border-color: var(--c-primary); color: var(--c-primary); }
.btn-dark { background: var(--c-dark); color: var(--c-white); }
.btn-dark:hover { background: var(--c-dark-3); }
.btn-wa { background: #25D366; color: #fff; }
.btn-wa:hover { background: #1eb958; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--c-dark);
  color: var(--c-white);
  overflow: hidden;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
  min-height: 560px;
  padding: 64px 0;
}
.hero-badge {
  display: inline-block;
  background: rgba(242,169,0,.15);
  color: var(--c-primary);
  border: 1px solid rgba(242,169,0,.4);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.hero h1 {
  font-family: var(--font-head);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 600;
  line-height: 1.08;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero h1 em { color: var(--c-primary); font-style: normal; }
.hero p.lead {
  font-size: 18px;
  color: #cbd5e1;
  max-width: 520px;
  margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 44px;
  flex-wrap: wrap;
}
.hero-stats .stat b {
  font-family: var(--font-head);
  font-size: 34px;
  color: var(--c-primary);
  display: block;
  line-height: 1;
}
.hero-stats .stat span { font-size: 13px; color: #9ca3af; }

.hero-visual { position: relative; }
.hero-visual img { width: 100%; border-radius: var(--radius); }

/* ---------- 区块通用 ---------- */
.section { padding: 80px 0; }
.section-alt { background: var(--c-light); }
.section-head { max-width: 680px; margin-bottom: 48px; }
.section-head .kicker {
  color: var(--c-primary-dark);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-size: 13px;
  margin-bottom: 10px;
}
.section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 600;
  text-transform: uppercase;
  line-height: 1.1;
  margin-bottom: 14px;
}
.section-head p { color: var(--c-gray); font-size: 16px; }

/* ---------- 产品卡片 ---------- */
.grid { display: grid; gap: 24px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.product-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .2s, box-shadow .2s;
  display: flex;
  flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.product-card .thumb { aspect-ratio: 4/3; background: var(--c-light); }
.product-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-card .body { padding: 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.product-card .tag {
  font-size: 12px; font-weight: 700; color: var(--c-primary-dark);
  text-transform: uppercase; letter-spacing: .5px;
}
.product-card h3 { font-family: var(--font-head); font-size: 20px; font-weight: 600; text-transform: uppercase; }
.product-card .specs { font-size: 13px; color: var(--c-gray); }
.product-card .link { margin-top: auto; color: var(--c-dark); font-weight: 700; font-size: 14px; }
.product-card .link:hover { color: var(--c-primary-dark); }

/* ---------- 特性/信任 ---------- */
.feature { display: flex; gap: 16px; }
.feature .icon {
  flex: 0 0 52px; height: 52px; border-radius: 10px;
  background: var(--c-primary-soft); display: flex; align-items: center; justify-content: center;
}
.feature .icon svg { width: 26px; height: 26px; }
.feature h3 { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.feature p { font-size: 14px; color: var(--c-gray); }

/* ---------- 规格表 ---------- */
.spec-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.spec-table th, .spec-table td {
  padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--c-border);
}
.spec-table th {
  background: var(--c-light); font-weight: 700; width: 34%;
  color: var(--c-dark);
}
.spec-table tr:nth-child(even) td { background: #fafafa; }

/* ---------- 应用场景 ---------- */
.app-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 3/2; display: flex; align-items: flex-end;
}
.app-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.app-card .overlay {
  position: relative; z-index: 2; padding: 24px; width: 100%;
  background: linear-gradient(transparent, rgba(0,0,0,.75));
  color: var(--c-white);
}
.app-card h3 { font-family: var(--font-head); font-size: 20px; text-transform: uppercase; }

/* ---------- CTA 横条 ---------- */
.cta-band {
  background: var(--c-primary);
  color: var(--c-dark);
  padding: 64px 0;
}
.cta-band .inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-band h2 { font-family: var(--font-head); font-size: clamp(26px,3.5vw,38px); font-weight: 600; text-transform: uppercase; }

/* ---------- 询盘表单 ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label { font-size: 14px; font-weight: 600; }
.form-group input, .form-group select, .form-group textarea {
  padding: 13px 14px; border: 1px solid var(--c-border); border-radius: var(--radius-sm);
  font-size: 15px; font-family: var(--font-body); background: var(--c-white);
  transition: border .15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--c-primary-dark);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-dark); color: #9ca3af; padding: 64px 0 32px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.site-footer h4 { color: var(--c-white); font-size: 15px; margin-bottom: 16px; }
.site-footer a { display: block; font-size: 14px; margin-bottom: 10px; color: #9ca3af; }
.site-footer a:hover { color: var(--c-primary); }
.site-footer .logo { margin-bottom: 16px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08); padding-top: 24px;
  display: flex; justify-content: space-between; font-size: 13px; flex-wrap: wrap; gap: 8px;
}

/* ---------- 浮动 WhatsApp ---------- */
.wa-float {
  position: fixed; right: 24px; bottom: 24px; z-index: 99;
  width: 56px; height: 56px; border-radius: 50%;
  background: #25D366; display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: transform .2s;
}
.wa-float:hover { transform: scale(1.08); }
.wa-float svg { width: 30px; height: 30px; fill: #fff; }

/* ---------- 面包屑 / 页头 ---------- */
.page-hero {
  background: var(--c-dark); color: var(--c-white);
  padding: 64px 0; text-align: center;
}
.page-hero h1 { font-family: var(--font-head); font-size: clamp(30px,4vw,44px); text-transform: uppercase; font-weight: 600; }
.page-hero p { color: #cbd5e1; margin-top: 12px; }
.breadcrumb { font-size: 13px; color: #9ca3af; margin-bottom: 12px; }
.breadcrumb a:hover { color: var(--c-primary); }

/* ---------- 产品详情布局 ---------- */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.detail-gallery img { width: 100%; border-radius: var(--radius); }
.detail-info h1 { font-family: var(--font-head); font-size: clamp(28px,3.5vw,40px); text-transform: uppercase; font-weight: 600; }
.detail-info .price-hint { color: var(--c-primary-dark); font-weight: 700; font-size: 18px; margin: 12px 0; }
.detail-info .desc { color: var(--c-gray); margin-bottom: 24px; }
.detail-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 24px 0; }
.detail-highlights li {
  background: var(--c-light); padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 14px; display: flex; align-items: center; gap: 8px;
}
.detail-highlights li::before { content: "✓"; color: var(--c-success); font-weight: 700; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .detail-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links {
    position: absolute; top: 68px; left: 0; right: 0;
    background: var(--c-dark-2); flex-direction: column; padding: 24px;
    gap: 18px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
  .section { padding: 56px 0; }
}