/* MYHSEN B2B 工厂站 — 共用样式 */
/* 主色：深黑 + 高级灰 + 暖橙（强调） */

* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --color-primary: #1a1a1a;
  --color-secondary: #f5f5f5;
  --color-accent: #d97706;
  --color-text: #2a2a2a;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: #fff;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }
img { max-width: 100%; height: auto; display: block; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}
.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--color-primary);
}
.logo small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 1px;
  color: var(--color-text-light);
  margin-top: 2px;
}
.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
}
.nav-menu a {
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text);
}
.nav-menu a.active {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 4px;
}
.lang-switch {
  display: flex;
  gap: 8px;
  font-size: 12px;
  color: var(--color-text-light);
}
.lang-switch button {
  background: none;
  border: 1px solid var(--color-border);
  padding: 4px 10px;
  cursor: pointer;
  border-radius: 4px;
  font-size: 12px;
}
.lang-switch button.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
  color: #fff;
  padding: 100px 24px 80px;
  text-align: center;
}
.hero h1 {
  font-size: 56px;
  font-weight: 800;
  letter-spacing: 2px;
  margin-bottom: 20px;
  line-height: 1.1;
}
.hero .tagline {
  font-size: 18px;
  color: rgba(255,255,255,0.85);
  margin-bottom: 40px;
  letter-spacing: 1px;
}
.hero .cta-group {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  border-radius: 0;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: #b45309;
  border-color: #b45309;
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,0.4);
}
.btn-outline:hover {
  border-color: #fff;
  color: #fff;
}

/* ===== Section 通用 ===== */
.section {
  padding: 80px 24px;
}
.section-alt {
  background: var(--color-secondary);
}
.container {
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-title {
  font-size: 36px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.section-subtitle {
  text-align: center;
  color: var(--color-text-light);
  font-size: 16px;
  margin-bottom: 56px;
  letter-spacing: 1px;
}

/* ===== Stats 卡片 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-top: 48px;
}
.stat-card {
  text-align: center;
  padding: 32px 24px;
  border: 1px solid var(--color-border);
  background: #fff;
}
.stat-number {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-top: 12px;
}

/* ===== 产品网格 ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.08);
}
.product-thumb {
  aspect-ratio: 1;
  background: linear-gradient(135deg, #e5e7eb 0%, #d1d5db 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--color-text-light);
  letter-spacing: 2px;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}
.product-thumb::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
}
.product-info {
  padding: 20px 24px 24px;
}
.product-info h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.product-info p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ===== 关于我们 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-image {
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #e5e7eb 0%, #9ca3af 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  letter-spacing: 2px;
}
.about-text h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.about-text p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.8;
}
.about-list {
  list-style: none;
  margin-top: 24px;
}
.about-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
}
.about-list li::before {
  content: "✓";
  color: var(--color-accent);
  font-weight: 700;
  font-size: 18px;
}

/* ===== OEM 流程 ===== */
.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 48px;
}
.process-step {
  text-align: center;
  padding: 32px 20px;
  background: #fff;
  border: 1px solid var(--color-border);
  position: relative;
}
.process-num {
  display: inline-block;
  width: 48px;
  height: 48px;
  line-height: 48px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  font-weight: 800;
  margin-bottom: 16px;
  font-size: 18px;
}
.process-step h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.process-step p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== 联系表单 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
}
.contact-info h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 24px;
  letter-spacing: 1px;
}
.contact-info p {
  color: var(--color-text-light);
  margin-bottom: 24px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
}
.contact-item-icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-item-text strong {
  display: block;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 4px;
  letter-spacing: 1px;
}
.contact-item-text span {
  font-size: 14px;
  color: var(--color-text-light);
}
.contact-form {
  background: var(--color-secondary);
  padding: 40px;
}
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: inherit;
  border: 1px solid var(--color-border);
  background: #fff;
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.form-group textarea {
  min-height: 120px;
  resize: vertical;
}
.form-submit {
  width: 100%;
  padding: 16px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition);
}
.form-submit:hover {
  background: var(--color-accent);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary);
  color: #fff;
  padding: 56px 24px 24px;
}
.footer-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  color: var(--color-accent);
}
.footer-col p,
.footer-col li {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  line-height: 1.8;
}
.footer-col ul {
  list-style: none;
}
.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ===== 手机端 ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 36px; }
  .hero { padding: 60px 24px; }
  .section { padding: 56px 20px; }
  .section-title { font-size: 28px; }
  .about-grid,
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .nav-menu { display: none; }
  .nav-menu.mobile-open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: #fff;
    padding: 16px 24px;
    gap: 16px;
    border-top: 1px solid var(--color-border);
  }
  .mobile-menu-btn {
    display: block;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
  }
}
@media (min-width: 769px) {
  .mobile-menu-btn { display: none; }
}