/* ===== 基础重置与变量 ===== */
:root {
  --primary: #1a365d;
  --primary-light: #2c5282;
  --accent: #ed8936;
  --accent-hover: #dd6b20;
  --text: #2d3748;
  --text-light: #718096;
  --bg: #f7fafc;
  --white: #ffffff;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: var(--shadow); }
.navbar .container {
  display: flex; align-items: center; justify-content: space-between; height: 72px;
}
.logo {
  font-size: 1.5rem; font-weight: 700; color: var(--primary);
  display: flex; align-items: center; gap: 8px;
}
.logo-icon {
  width: 36px; height: 36px; background: var(--primary); border-radius: 8px;
  display: flex; align-items: center; justify-content: center; color: white; font-size: 1.1rem;
}
.nav-links { display: flex; gap: 40px; }
.nav-links a {
  font-size: 0.95rem; font-weight: 500; color: var(--text-light);
  transition: color 0.2s; position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -6px; left: 0; right: 0;
  height: 2px; background: var(--accent); border-radius: 1px;
}
.nav-cta {
  background: var(-hover); color: white; padding: 10px 24px; border-radius: 6px;
  font-weight: 600; font-size: 0.9rem; transition: background 0.2s;
}
.nav-cta:hover { background: var(-hover); }
.mobile-toggle { display: none; font-size: 1.5rem; cursor: pointer; }

/* ===== Hero 区域 ===== */
.hero {
  padding: 140px 0 100px; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 80%; height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
}
.hero .container { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.15); padding: 8px 16px; border-radius: 100px;
  font-size: 0.85rem; margin-bottom: 24px;
}
.hero-badge .dot { width: 8px; height: 8px; background: #48bb78; border-radius: 50%; }
.hero h1 { font-size: 3rem; font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.15rem; color: rgba(255,255,255,0.85); margin-bottom: 32px; max-width: 520px; }
.hero-btns { display: flex; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px;
  border-radius: 8px; font-weight: 600; font-size: 1rem; transition: all 0.2s; cursor: pointer; border: none;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-outline { background: transparent; color: white; border: 2px solid rgba(255,255,255,0.4); }
.btn-outline:hover { border-color: white; background: rgba(255,255,255,0.1); }
.hero-visual {
  background: rgba(255,255,255,0.1); border-radius: 16px; padding: 40px;
  backdrop-filter: blur(10px); border: 1px solid rgba(255,255,255,0.15);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px;
}
.hero-stat {
  text-align: center; padding: 20px; background: rgba(255,255,255,0.08); border-radius: 12px;
}
.hero-stat .num { font-size: 2.2rem; font-weight: 800; color: var(--accent); }
.hero-stat .label { font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-top: 4px; }

/* ===== 信任标识 ===== */
.trust { padding: 40px 0; background: var(--white); border-bottom: 1px solid var(--border); }
.trust-label { text-align: center; font-size: 0.85rem; color: var(--text-light); margin-bottom: 20px; }
.trust-logos {
  display: flex; justify-content: center; align-items: center; gap: 48px; flex-wrap: wrap;
}
.trust-logo {
  height: 32px; opacity: 0.5; filter: grayscale(100%);
  transition: opacity 0.3s, filter 0.3s;
}
.trust-logo:hover { opacity: 0.8; filter: grayscale(0%); }

/* ===== 通用区块标题 ===== */
.section-header { text-align: center; max-width: 640px; margin: 0 auto 60px; }
.section-tag {
  display: inline-block; background: rgba(26,54,93,0.08); color: var(--primary);
  padding: 6px 16px; border-radius: 100px; font-size: 0.8rem; font-weight: 600; margin-bottom: 16px;
}
.section-header h2 { font-size: 2.2rem; font-weight: 700; color: var(--primary); margin-bottom: 12px; }
.section-header p { font-size: 1.05rem; color: var(--text-light); }

/* ===== 核心优势 ===== */
.advantages { padding: 100px 0; background: var(--bg); }
.adv-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.adv-card {
  background: var(--white); padding: 32px 24px; border-radius: 12px;
  border: 1px solid var(--border); transition: all 0.3s;
}
.adv-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.adv-icon {
  width: 56px; height: 56px; background: rgba(26,54,93,0.06); border-radius: 12px;
  display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin-bottom: 20px;
}
.adv-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--primary); }
.adv-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.6; }

/* ===== 产品展示 ===== */
.products { padding: 100px 0; background: var(--white); }
.prod-tabs {
  display: flex; justify-content: center; gap: 8px; margin-bottom: 48px;
}
.prod-tab {
  padding: 10px 28px; border-radius: 8px; font-weight: 500; cursor: pointer;
  background: var(--bg); color: var(--text-light); border: none; transition: all 0.2s;
}
.prod-tab.active { background: var(--primary); color: white; }
.prod-tab:hover:not(.active) { background: var(--border); }
.prod-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.prod-card {
  background: var(--bg); border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border); transition: all 0.3s;
}
.prod-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.prod-img {
  height: 280px; background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%);
  display: flex; align-items: center; justify-content: center; font-size: 3rem; color: var(--text-light);
}
.prod-info { padding: 24px; }
.prod-info h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--primary); }
.prod-info p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 16px; }
.prod-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.prod-tag {
  font-size: 0.75rem; padding: 4px 10px; background: rgba(26,54,93,0.06);
  color: var(--primary-light); border-radius: 4px; font-weight: 500;
}

/* ===== 制造能力 ===== */
.capability { padding: 100px 0; background: var(--bg); }
.cap-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center;
}
.cap-visual {
  background: var(--white); border-radius: 16px; padding: 40px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.cap-visual h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 24px; color: var(--primary); }
.cap-item {
  display: flex; align-items: center; gap: 16px; padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.cap-item:last-child { border-bottom: none; }
.cap-item-icon { width: 44px; height: 44px; background: rgba(237,137,54,0.1); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: var(--accent); flex-shrink: 0; }
.cap-item-text h4 { font-size: 1rem; font-weight: 600; color: var(--primary); }
.cap-item-text p { font-size: 0.85rem; color: var(--text-light); }
.cap-list { display: flex; flex-direction: column; gap: 16px; }
.cap-list-item {
  display: flex; align-items: flex-start; gap: 12px; padding: 16px 20px;
  background: var(--white); border-radius: 10px; border: 1px solid var(--border);
}
.cap-list-item .check { width: 24px; height: 24px; background: rgba(72,187,120,0.1); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #48bb78; font-size: 0.8rem; flex-shrink: 0; margin-top: 2px; }
.cap-list-item h4 { font-size: 1rem; font-weight: 600; color: var(--primary); margin-bottom: 4px; }
.cap-list-item p { font-size: 0.9rem; color: var(--text-light); }

/* ===== 品质管控 ===== */
.quality { padding: 100px 0; background: var(--white); }
.quality-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.quality-card {
  background: var(--bg); border-radius: 12px; padding: 32px;
  border: 1px solid var(--border); text-align: center; transition: all 0.3s;
}
.quality-card:hover { box-shadow: var(--shadow-lg); }
.quality-card .icon {
  width: 64px; height: 64px; background: rgba(26,54,93,0.06); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 1.8rem;
  margin: 0 auto 20px; color: var(--primary);
}
.quality-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--primary); }
.quality-card p { font-size: 0.9rem; color: var(--text-light); }

/* ===== CTA 区块 ===== */
.cta-section {
  padding: 100px 0; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white; text-align: center;
}
.cta-section h2 { font-size: 2.4rem; font-weight: 700; margin-bottom: 16px; }
.cta-section p { font-size: 1.1rem; color: rgba(255,255,255,0.8); margin-bottom: 32px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ===== 页脚 ===== */
.footer { background: #0d1b2a; color: rgba(255,255,255,0.6); padding: 60px 0 24px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px;
}
.footer-brand .logo { color: white; margin-bottom: 16px; }
.footer-brand p { font-size: 0.9rem; line-height: 1.7; }
.footer-col h4 { color: white; font-size: 0.95rem; font-weight: 600; margin-bottom: 20px; }
.footer-col a { display: block; font-size: 0.9rem; margin-bottom: 12px; transition: color 0.2s; }
.footer-col a:hover { color: white; }

.social-links { display: flex; gap: 12px; margin-bottom: 16px; }
.social-links a { transition: transform 0.2s, opacity 0.2s; line-height: 0; }
.social-links a:hover { transform: translateY(-3px); opacity: 0.8; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}
/* ===== 页面标题区 ===== */
.page-header {
  padding: 120px 0 60px; background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white; text-align: center;
}
.page-header h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 12px; }
.page-header p { font-size: 1.1rem; color: rgba(255,255,255,0.8); }

/* ===== 内容页通用 ===== */
.content-section { padding: 80px 0; }
.content-section.alt { background: var(--bg); }

/* ===== 关于页 - 时间线 ===== */
.timeline { position: relative; padding-left: 40px; }
.timeline::before {
  content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: var(--border);
}
.timeline-item { position: relative; padding-bottom: 32px; }
.timeline-item::before {
  content: ''; position: absolute; left: -36px; top: 4px; width: 16px; height: 16px;
  background: var(--accent); border-radius: 50%; border: 3px solid var(--white);
  box-shadow: 0 0 0 2px var(--accent);
}
.timeline-item h4 { font-size: 1rem; font-weight: 600; color: var(--primary); margin-bottom: 4px; }
.timeline-item p { font-size: 0.9rem; color: var(--text-light); }

/* ===== 设备展示 ===== */
.equip-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}
.equip-card {
  background: var(--white); border-radius: 12px; padding: 24px; text-align: center;
  border: 1px solid var(--border); transition: all 0.3s;
}
.equip-card:hover { box-shadow: var(--shadow); }
.equip-card .icon { font-size: 2.5rem; margin-bottom: 12px; }
.equip-card h4 { font-size: 1rem; font-weight: 600; color: var(--primary); margin-bottom: 4px; }
.equip-card p { font-size: 0.85rem; color: var(--text-light); }

/* ===== 联系页 ===== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start;
}
.contact-info h3 { font-size: 1.3rem; font-weight: 600; color: var(--primary); margin-bottom: 24px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 24px; }
.contact-item .icon {
  width: 44px; height: 44px; background: rgba(26,54,93,0.06); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem; color: var(--primary); flex-shrink: 0;
}
.contact-item h4 { font-size: 0.95rem; font-weight: 600; color: var(--primary); margin-bottom: 2px; }
.contact-item p { font-size: 0.9rem; color: var(--text-light); }
.contact-form {
  background: var(--white); border-radius: 16px; padding: 40px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; color: var(--primary); margin-bottom: 6px; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.95rem; font-family: inherit; transition: border-color 0.2s; background: var(--bg);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--primary-light);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== 产品详情页 ===== */
.prod-detail-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; margin-bottom: 80px;
}
.prod-detail-grid.reverse { direction: rtl; }
.prod-detail-grid.reverse > * { direction: ltr; }
.prod-detail-visual {
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e0 100%); border-radius: 16px;
  height: 360px; display: flex; align-items: center; justify-content: center; font-size: 5rem; color: var(--text-light);
}
.prod-detail-text h3 { font-size: 1.8rem; font-weight: 700; color: var(--primary); margin-bottom: 16px; }
.prod-detail-text p { font-size: 1rem; color: var(--text-light); margin-bottom: 20px; line-height: 1.7; }
.prod-detail-list { display: flex; flex-direction: column; gap: 12px; }
.prod-detail-list li {
  display: flex; align-items: center; gap: 10px; font-size: 0.95rem; color: var(--text);
}
.prod-detail-list li::before {
  content: '✓'; width: 22px; height: 22px; background: rgba(72,187,120,0.1); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; color: #48bb78; font-size: 0.75rem; flex-shrink: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .equip-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .mobile-toggle { display: block; color: var(--primary); }
  .hero-grid, .cap-grid, .contact-grid, .prod-detail-grid { grid-template-columns: 1fr; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 2rem; }
  .adv-grid, .prod-grid, .quality-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .equip-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .page-header h1 { font-size: 1.8rem; }
  .cta-section h2 { font-size: 1.8rem; }
}

/* ===== 移动端菜单 ===== */
.mobile-menu {
  display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
  background: var(--white); z-index: 999; padding: 24px;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block; padding: 16px; font-size: 1.1rem; font-weight: 500;
  border-bottom: 1px solid var(--border); color: var(--text);
}
.mobile-menu a.active { color: var(--primary); }
.mobile-menu .nav-cta { display: block; text-align: center; margin-top: 24px; }