/* ========================================
   威恳非晶 - 企业官网样式
   沉稳工业风 | 重工业金属质感
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-deep:     #0b131c;
  --bg-dark:     #111c28;
  --bg-section:  #162231;
  --bg-card:     #1c2b3d;
  --bg-card-hover:#22344a;
  --border:      #263548;
  --border-light:#334660;
  --text-primary:#e4ecf5;
  --text-secondary:#92a5ba;
  --text-muted:  #5c7089;
  --accent:      #c49b4f;
  --accent-light:#d4b36a;
  --accent-glow: rgba(196, 155, 79, 0.18);
  --white:       #ffffff;
  --radius:      4px;
  --radius-lg:   8px;
  --transition:  0.3s ease;
  --font-cn:     "Microsoft YaHei", "微软雅黑", "PingFang SC", "Helvetica Neue", sans-serif;
  --font-en:     "Helvetica Neue", "Arial", sans-serif;
  --max-width:   1200px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

/* --- Utility --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-dark { background: var(--bg-dark); }
.section-title { text-align: center; margin-bottom: 60px; }
.section-title h2 {
  font-size: 2.2rem; font-weight: 700; color: var(--white);
  margin-bottom: 12px; letter-spacing: 2px;
}
.section-title .en {
  font-size: 0.85rem; color: var(--accent); text-transform: uppercase;
  letter-spacing: 3px; font-family: var(--font-en);
}
.section-title .divider {
  width: 50px; height: 3px; background: var(--accent);
  margin: 16px auto 0;
}

/* --- Header / Nav --- */
.header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(11, 19, 28, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}
.header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 72px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo .icon {
  width: 42px; height: 42px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--accent), #a67f3d);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.2rem; color: var(--bg-deep);
  letter-spacing: 1px;
}
.logo .name { font-size: 1.25rem; font-weight: 700; color: var(--white); letter-spacing: 1px; }
.logo .name small { display: block; font-size: 0.65rem; color: var(--text-muted); font-weight: 400; letter-spacing: 1px; }

.nav { display: flex; align-items: center; gap: 36px; }
.nav a {
  font-size: 0.9rem; color: var(--text-secondary); font-weight: 500;
  letter-spacing: 1px; position: relative; padding: 8px 0;
  transition: color var(--transition);
}
.nav a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
  background: var(--accent); transition: width var(--transition);
}
.nav a:hover, .nav a.active { color: var(--white); }
.nav a:hover::after, .nav a.active::after { width: 100%; }

/* Mobile Menu Toggle */
.menu-toggle { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.menu-toggle span { display: block; width: 24px; height: 2px; background: var(--text-primary); margin: 5px 0; transition: var(--transition); }

/* --- Footer --- */
.footer {
  background: var(--bg-dark); border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer h4 { color: var(--white); font-size: 1rem; margin-bottom: 16px; letter-spacing: 1px; }
.footer p, .footer a { font-size: 0.85rem; color: var(--text-secondary); line-height: 2; }
.footer-bottom {
  border-top: 1px solid var(--border); padding-top: 24px;
  text-align: center; font-size: 0.8rem; color: var(--text-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-block; padding: 14px 36px; border: none; cursor: pointer;
  font-size: 0.9rem; font-weight: 600; letter-spacing: 1px;
  border-radius: var(--radius); transition: all var(--transition);
  font-family: var(--font-cn);
}
.btn-primary {
  background: var(--accent); color: var(--bg-deep);
}
.btn-primary:hover { background: var(--accent-light); }
.btn-outline {
  background: transparent; color: var(--white);
  border: 1px solid var(--border-light);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* --- Hero Section --- */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  background: linear-gradient(135deg, var(--bg-deep) 0%, #0d1a2a 50%, #121f2f 100%);
  position: relative; overflow: hidden; padding: 120px 0 80px;
}
.hero::before {
  content: ''; position: absolute;
  top: -50%; right: -20%; width: 700px; height: 700px;
  background: radial-gradient(circle, rgba(196,155,79,0.06) 0%, transparent 70%);
  border-radius: 50%;
}
.hero::after {
  content: ''; position: absolute;
  bottom: -30%; left: -15%; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(28,43,61,0.5) 0%, transparent 70%);
  border-radius: 50%;
}
.hero .container { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content h1 {
  font-size: 3.2rem; font-weight: 800; color: var(--white);
  line-height: 1.3; margin-bottom: 20px; letter-spacing: 3px;
}
.hero-content h1 span { color: var(--accent); display: inline-block; }
.hero-content .tagline {
  font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 12px;
  letter-spacing: 1px;
}
.hero-content .slogan {
  font-size: 1.4rem; color: var(--accent); font-weight: 600;
  margin-bottom: 36px; letter-spacing: 2px;
}
.hero-content .hero-stats { display: flex; gap: 40px; margin-top: 40px; }
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2.4rem; font-weight: 800; color: var(--accent); }
.hero-stat .label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; }
.hero-image {
  position: relative;
}
.hero-image img { border-radius: var(--radius-lg); box-shadow: 0 20px 60px rgba(0,0,0,0.5); }
.hero-image::before {
  content: ''; position: absolute; top: 12px; left: 12px;
  width: 100%; height: 100%; border: 1px solid var(--accent);
  border-radius: var(--radius-lg); z-index: -1;
}

/* --- Card Grid --- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.card-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.card-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }

.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 40px 30px;
  transition: all var(--transition); position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--transition);
}
.card:hover { border-color: var(--border-light); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.3); }
.card:hover::before { transform: scaleX(1); }

.card-icon {
  width: 56px; height: 56px; border-radius: var(--radius);
  background: var(--accent-glow); display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.5rem;
}
.card h3 { font-size: 1.15rem; color: var(--white); margin-bottom: 12px; letter-spacing: 1px; }
.card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8; }

/* --- Page Hero (inner pages) --- */
.page-hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, var(--bg-deep), var(--bg-dark));
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.page-hero h1 {
  font-size: 2.6rem; font-weight: 800; color: var(--white);
  letter-spacing: 3px; margin-bottom: 12px;
}
.page-hero .breadcrumb { font-size: 0.85rem; color: var(--text-muted); }
.page-hero .breadcrumb a { color: var(--accent); }
.page-hero .breadcrumb span { color: var(--text-muted); }

/* --- About Page --- */
.about-intro-text {
  font-size: 1.05rem; color: var(--text-secondary); line-height: 2;
  max-width: 900px; margin: 0 auto;
}

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 60px; }
.stat-box {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 36px 20px; text-align: center;
  transition: all var(--transition);
}
.stat-box:hover { border-color: var(--border-light); }
.stat-box .num { font-size: 2.2rem; font-weight: 800; color: var(--accent); display: block; }
.stat-box .unit { font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; }

.timeline { position: relative; padding-left: 40px; margin: 40px 0; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; width: 2px; height: 100%;
  background: linear-gradient(180deg, var(--accent), var(--border));
}
.timeline-item { position: relative; margin-bottom: 36px; padding-left: 30px; }
.timeline-item::before {
  content: ''; position: absolute; left: -45px; top: 6px;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--bg-section);
}
.timeline-item .year { font-size: 1.1rem; font-weight: 700; color: var(--accent); margin-bottom: 4px; }
.timeline-item p { color: var(--text-secondary); font-size: 0.9rem; }

/* --- Products Page --- */
.product-tabs { display: flex; justify-content: center; gap: 0; margin-bottom: 48px; border-bottom: 1px solid var(--border); }
.product-tab {
  padding: 14px 32px; cursor: pointer; font-size: 0.9rem;
  color: var(--text-secondary); font-weight: 600; letter-spacing: 1px;
  background: none; border: none; border-bottom: 2px solid transparent;
  transition: all var(--transition); font-family: var(--font-cn);
}
.product-tab:hover { color: var(--white); }
.product-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.product-detail { display: none; }
.product-detail.active { display: block; }

.product-showcase {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  margin-bottom: 60px; padding: 40px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
}
.product-showcase img { border-radius: var(--radius); }
.product-showcase h3 { font-size: 1.5rem; color: var(--white); margin-bottom: 16px; letter-spacing: 1px; }
.product-showcase p { color: var(--text-secondary); line-height: 1.9; margin-bottom: 12px; }

.spec-table { width: 100%; border-collapse: collapse; margin: 30px 0; }
.spec-table th {
  background: var(--bg-dark); color: var(--accent); padding: 14px 16px;
  text-align: left; font-size: 0.85rem; letter-spacing: 1px; border-bottom: 2px solid var(--border);
}
.spec-table td {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  color: var(--text-secondary); font-size: 0.85rem;
}
.spec-table tr:hover td { background: rgba(196,155,79,0.03); }

/* --- Culture Page --- */
.culture-block {
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
  margin-bottom: 80px;
}
.culture-block.reverse { direction: rtl; }
.culture-block.reverse .culture-text { direction: ltr; }
.culture-text h3 { font-size: 1.5rem; color: var(--white); margin-bottom: 16px; letter-spacing: 1px; }
.culture-text p { color: var(--text-secondary); line-height: 2; margin-bottom: 12px; }
.culture-icon-box {
  width: 64px; height: 64px; border: 1px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.8rem;
  border-radius: var(--radius);
}

.quote-box {
  background: var(--bg-card); border-left: 4px solid var(--accent);
  padding: 32px 40px; border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  margin: 40px 0;
}
.quote-box .text { font-size: 1.1rem; color: var(--white); font-weight: 600; line-height: 1.8; }
.quote-box .author { font-size: 0.85rem; color: var(--accent); margin-top: 12px; }

.env-data { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin: 40px 0; }

/* --- Contact Page --- */
.contact-grid { display: grid; grid-template-columns: 5fr 4fr; gap: 48px; }
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 48px; }
.form-group { margin-bottom: 24px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 8px; letter-spacing: 1px; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%; padding: 14px 16px; background: var(--bg-section);
  border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text-primary); font-size: 0.9rem; font-family: var(--font-cn);
  transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none; border-color: var(--accent);
}
.form-group textarea { min-height: 140px; resize: vertical; }
.form-group select option { background: var(--bg-dark); }

.contact-info-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 40px;
}
.contact-info-card h3 { font-size: 1.2rem; color: var(--white); margin-bottom: 24px; letter-spacing: 1px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 24px; align-items: flex-start; }
.contact-item .icon { color: var(--accent); font-size: 1.2rem; min-width: 24px; text-align: center; }
.contact-item .info p, .contact-item .info span { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.8; }
.contact-item .info strong { color: var(--white); display: block; margin-bottom: 4px; font-size: 0.85rem; }

/* --- Comparison Table --- */
.compare-table { width: 100%; border-collapse: collapse; margin: 30px 0; }
.compare-table thead th {
  background: var(--accent); color: var(--bg-deep); padding: 16px;
  font-size: 0.9rem; font-weight: 700; letter-spacing: 1px;
}
.compare-table tbody td {
  padding: 14px 16px; border-bottom: 1px solid var(--border);
  color: var(--text-secondary); font-size: 0.85rem; text-align: center;
}
.compare-table tbody tr:nth-child(even) td { background: rgba(28,43,61,0.3); }
.compare-table .highlight { color: var(--accent); font-weight: 600; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .card-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .env-data { grid-template-columns: repeat(2, 1fr); }
  .hero .container { grid-template-columns: 1fr; }
  .hero-image { max-width: 500px; margin: 0 auto; }
  .product-showcase { grid-template-columns: 1fr; }
  .culture-block { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav { display: none; position: fixed; top: 72px; left: 0; width: 100%;
    background: rgba(17,28,40,0.98); backdrop-filter: blur(10px);
    flex-direction: column; padding: 24px; gap: 20px; border-bottom: 1px solid var(--border);
  }
  .nav.open { display: flex; }
  .menu-toggle { display: block; }
  .card-grid, .card-grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-content h1 { font-size: 2.2rem; }
  .product-tabs { flex-wrap: wrap; }
  .product-tab { padding: 12px 20px; }
  .page-hero h1 { font-size: 2rem; }
}

/* --- Animations --- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp 0.8s ease forwards; }