/* ===== GoldenLock - Smart Lock ===== */
/* CSS Custom Properties */
:root {
  --bg: #0a0a0a;
  --bg-secondary: #111;
  --bg-card: #1a1a1a;
  --text: #e8e8e8;
  --text-secondary: #999;
  --text-muted: #666;
  --accent: #c8a45c;
  --accent-dim: #a08040;
  --border: #2a2a2a;
  --border-light: #333;
  --radius: 8px;
  --radius-lg: 16px;
  --max-width: 1280px;
  --nav-height: 64px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: rgba(10,10,10,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width); margin: 0 auto;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
}

.nav-brand {
  font-size: 1.25rem; font-weight: 700; letter-spacing: 0.02em;
  color: var(--text);
}
.nav-brand span { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 32px; }

.nav-links a {
  font-size: 0.875rem; color: var(--text-secondary);
  transition: color var(--transition); letter-spacing: 0.05em;
  text-transform: uppercase;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.lang-btn {
  background: none; border: 1px solid var(--border-light); color: var(--text-secondary);
  padding: 6px 14px; border-radius: 20px; cursor: pointer;
  font-size: 0.75rem; letter-spacing: 0.05em;
  transition: all var(--transition);
}
.lang-btn:hover { border-color: var(--accent); color: var(--accent); }
.lang-btn.active-lang { border-color: var(--accent); color: var(--accent); }

.nav-toggle { display: none; background: none; border: none; color: var(--text); cursor: pointer; }

/* ===== Hero ===== */
.hero {
  margin-top: var(--nav-height);
  height: 80vh; min-height: 500px;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #0a0a0a 0%, #1a1410 40%, #0d0d0d 100%);
  position: relative; overflow: hidden;
}

.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 50% 50%, rgba(200,164,92,0.06) 0%, transparent 70%);
}

.hero-content {
  text-align: center; position: relative; z-index: 1;
  padding: 0 24px;
}

.hero-content h1 {
  font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 300;
  letter-spacing: 0.04em; line-height: 1.2;
}
.hero-content h1 em { font-style: normal; color: var(--accent); }

.hero-content p {
  margin-top: 20px; font-size: 1.1rem;
  color: var(--text-secondary); max-width: 480px;
  margin-left: auto; margin-right: auto; line-height: 1.7;
}

/* ===== Sections ===== */
.section {
  padding: 100px 24px;
  max-width: var(--max-width); margin: 0 auto;
}

.section-header {
  text-align: center; margin-bottom: 64px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 300; letter-spacing: 0.03em;
}

.section-header p {
  margin-top: 12px; color: var(--text-secondary);
  font-size: 1rem;
}

/* ===== Category Cards ===== */
.categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.category-card {
  position: relative; border-radius: var(--radius-lg);
  overflow: hidden; cursor: pointer;
  background: var(--bg-card);
  aspect-ratio: 4/3;
  transition: transform var(--transition);
}
.category-card:hover { transform: translateY(-4px); }

.category-card .card-bg {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.85) 100%);
  z-index: 1;
}

.category-card .card-img {
  width: 100%; height: 100%; object-fit: cover;
  background: var(--bg-secondary);
}

.category-card .card-text {
  position: absolute; bottom: 0; left: 0; right: 0;
  z-index: 2; padding: 32px 28px;
}

.category-card .card-text h3 {
  font-size: 1.5rem; font-weight: 400; letter-spacing: 0.03em;
}

.category-card .card-text span {
  display: inline-block; margin-top: 8px;
  font-size: 0.8rem; color: var(--accent);
  letter-spacing: 0.06em; text-transform: uppercase;
}

/* ===== Product Grid ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  overflow: hidden; transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid transparent;
}
.product-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-light);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.product-card .img-wrap {
  aspect-ratio: 1/1; background: var(--bg-secondary);
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.product-card .img-wrap img {
  width: 100%; height: 100%; object-fit: cover;
}

.product-card .info { padding: 24px 20px; }

.product-card .info .category-tag {
  font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--accent-dim);
  margin-bottom: 8px;
}

.product-card .info h3 {
  font-size: 1.1rem; font-weight: 500; margin-bottom: 8px;
  line-height: 1.4;
}

.product-card .info .specs {
  font-size: 0.85rem; color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== Product Detail ===== */
.product-detail {
  margin-top: var(--nav-height);
  padding: 60px 24px; max-width: var(--max-width);
  margin-left: auto; margin-right: auto;
}

.product-detail .back-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.85rem; color: var(--text-secondary);
  margin-bottom: 40px; transition: color var(--transition);
}
.product-detail .back-link:hover { color: var(--accent); }

.product-detail .detail-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: start;
}

.product-detail .gallery { position: sticky; top: calc(var(--nav-height) + 40px); }

.product-detail .gallery .main-img {
  aspect-ratio: 1/1; background: var(--bg-card); border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
}
.product-detail .gallery .main-img img {
  width: 100%; height: 100%; object-fit: cover;
}

.product-detail .gallery .thumb-list {
  display: flex; gap: 12px;
}

.product-detail .gallery .thumb {
  width: 72px; height: 72px; border-radius: var(--radius);
  background: var(--bg-card); cursor: pointer;
  border: 1px solid transparent; overflow: hidden;
  transition: border-color var(--transition);
}
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-detail .gallery .thumb:hover,
.product-detail .gallery .thumb.active {
  border-color: var(--accent);
}

.product-detail .info h1 {
  font-size: 2rem; font-weight: 300; letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.product-detail .info .model {
  font-size: 0.85rem; color: var(--accent);
  letter-spacing: 0.06em; margin-bottom: 24px;
}

.product-detail .info .highlights {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px;
}
.product-detail .info .highlights span {
  padding: 6px 16px; border: 1px solid var(--border-light);
  border-radius: 20px; font-size: 0.8rem; color: var(--text-secondary);
}

.spec-table {
  width: 100%; border-collapse: collapse; margin: 32px 0;
}
.spec-table tr { border-bottom: 1px solid var(--border); }
.spec-table td {
  padding: 14px 0; font-size: 0.9rem;
}
.spec-table td:first-child {
  color: var(--text-secondary); width: 140px; font-size: 0.85rem;
}

.description-block { margin: 32px 0; }
.description-block h3 {
  font-size: 1rem; font-weight: 500; margin-bottom: 12px;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.description-block p {
  font-size: 0.9rem; color: var(--text-secondary); line-height: 1.8;
}

.inquire-btn {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 16px;
  padding: 14px 36px;
  background: var(--accent); color: #0a0a0a;
  border: none; border-radius: 4px;
  font-size: 0.9rem; font-weight: 600;
  cursor: pointer; letter-spacing: 0.04em;
  transition: background var(--transition);
}
.inquire-btn:hover { background: #d4b368; }

/* ===== Filters ===== */
.filters {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 40px; justify-content: center;
}

.filter-btn {
  padding: 8px 22px; border: 1px solid var(--border-light);
  border-radius: 20px; background: none; color: var(--text-secondary);
  cursor: pointer; font-size: 0.8rem; letter-spacing: 0.05em;
  transition: all var(--transition); text-transform: uppercase;
}
.filter-btn:hover { border-color: var(--text-muted); color: var(--text); }
.filter-btn.active {
  border-color: var(--accent); color: var(--accent);
}

/* ===== Contact Page ===== */
.contact-section {
  margin-top: var(--nav-height);
  padding: 100px 24px; max-width: 720px;
  margin-left: auto; margin-right: auto; text-align: center;
}

.contact-section h1 {
  font-size: 2.2rem; font-weight: 300; letter-spacing: 0.03em;
  margin-bottom: 40px;
}

.contact-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  padding: 48px 40px;
  border: 1px solid var(--border);
}

.contact-item {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; padding: 20px 0;
  border-bottom: 1px solid var(--border);
  font-size: 1rem;
}
.contact-item:last-child { border-bottom: none; }

.contact-item .label {
  color: var(--text-secondary); font-size: 0.85rem;
  min-width: 60px; text-align: right;
}
.contact-item .value { color: var(--text); font-weight: 500; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 48px 24px;
}

.footer-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 16px;
}

.footer-brand { font-weight: 600; letter-spacing: 0.04em; }
.footer-brand span { color: var(--accent); }

.footer-contact {
  display: flex; gap: 24px; font-size: 0.85rem; color: var(--text-secondary);
  flex-wrap: wrap;
}
.footer-contact a { transition: color var(--transition); }
.footer-contact a:hover { color: var(--text); }

.footer-copy { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Animations ===== */
.fade-in {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .categories { grid-template-columns: 1fr; }
  .product-detail .detail-grid { grid-template-columns: 1fr; gap: 40px; }
  .product-detail .gallery { position: static; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: rgba(10,10,10,0.98); padding: 24px;
    border-bottom: 1px solid var(--border); gap: 20px;
  }
  .nav-toggle { display: block; }

  .hero { height: 60vh; min-height: 400px; }

  .product-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-contact { justify-content: center; }

  .contact-card { padding: 32px 24px; }
}

@media (max-width: 480px) {
  .product-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 16px; }
  .product-detail { padding: 40px 16px; }
}