/* ============================================
   0035 - METALLIC PREMIUM 金属奢华风
   ============================================ */

:root {
  --bg-dark: #0a0a0a;
  --bg-card: #111111;
  --gold-1: #c9a84c;
  --gold-2: #f0d060;
  --gold-3: #a08030;
  --gold-light: #fef3c7;
  --silver: #b8b8b8;
  --silver-dark: #6b6b6b;
  --text-primary: #e8e8e8;
  --text-secondary: #9a9a9a;
}

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

body {
  font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Times New Roman', serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Gold particles */
body::before {
  content: '';
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(201,168,76,0.04) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(240,208,96,0.03) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(160,128,48,0.03) 0%, transparent 50%);
}

/* Gold dust particles */
.gold-dust {
  position: fixed; pointer-events: none; z-index: 0;
}
.gold-dust span {
  position: absolute; width: 2px; height: 2px; background: var(--gold-2);
  border-radius: 50%; animation: shimmer-particle 3s infinite;
  opacity: 0;
}
@keyframes shimmer-particle {
  0%,100% { opacity: 0; transform: translateY(0); }
  50% { opacity: 0.7; transform: translateY(-20px); }
}

/* ============ NAVBAR ============ */
.metal-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10,10,10,0.95); backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(201,168,76,0.3);
}
.metal-nav::after {
  content: ''; position: absolute; bottom: -1px; left: 10%; right: 10%;
  height: 2px; background: linear-gradient(90deg, transparent, var(--gold-1), var(--gold-2), var(--gold-1), transparent);
}
.metal-nav .container {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 2rem; max-width: 1280px; margin: 0 auto;
}
.nav-logo {
  font-size: 1.4rem; font-weight: 900; text-decoration: none;
  background: linear-gradient(180deg, #f0d060 0%, #c9a84c 30%, #8b6914 60%, #c9a84c 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: 3px; text-transform: uppercase;
  filter: drop-shadow(0 2px 4px rgba(201,168,76,0.3));
}
.nav-links { display: flex; gap: 1.5rem; list-style: none; align-items: center; }
.nav-links a {
  color: var(--silver); text-decoration: none; font-weight: 500; font-size: 0.9rem;
  letter-spacing: 2px; text-transform: uppercase; transition: all 0.3s; position: relative;
}
.nav-links a:hover { color: var(--gold-2); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 1px;
  background: linear-gradient(90deg, var(--gold-3), var(--gold-2), var(--gold-3));
  transition: width 0.3s;
}
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  padding: 0.5rem 1.5rem;
  background: linear-gradient(135deg, rgba(201,168,76,0.15), rgba(240,208,96,0.1));
  border: 1px solid rgba(201,168,76,0.5); color: var(--gold-2);
  font-weight: 600; font-size: 0.85rem; text-decoration: none;
  letter-spacing: 2px; text-transform: uppercase;
  transition: all 0.3s; position: relative; overflow: hidden;
}
.nav-cta::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
  animation: shimmer-sweep 3s infinite;
}
.nav-cta:hover { background: rgba(201,168,76,0.25); border-color: var(--gold-2); }
@keyframes shimmer-sweep {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: 1px solid var(--gold-3); padding: 8px; }
.hamburger span { width: 24px; height: 2px; background: var(--gold-2); border-radius: 1px; }

/* ============ HERO ============ */
.hero-section {
  position: relative; z-index: 1; padding: 8rem 1.5rem 5rem;
  text-align: center; min-height: 90vh; display: flex; flex-direction: column;
  align-items: center; justify-content: center;
}
.hero-ornament {
  width: 80px; height: 3px; margin: 0 auto 1.5rem;
  background: linear-gradient(90deg, transparent, var(--gold-1), var(--gold-2), var(--gold-1), transparent);
}
.hero-badge {
  display: inline-block; padding: 0.4rem 1.8rem;
  border: 1px solid rgba(201,168,76,0.5); color: var(--gold-2);
  font-size: 0.75rem; letter-spacing: 5px; text-transform: uppercase;
  margin-bottom: 1.5rem; background: rgba(201,168,76,0.05);
}
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 900; line-height: 1.15;
  margin-bottom: 1.5rem; max-width: 850px;
  background: linear-gradient(180deg, #fef3c7 0%, #f0d060 25%, #c9a84c 50%, #8b6914 75%, #c9a84c 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 3px 6px rgba(201,168,76,0.25));
  letter-spacing: 2px;
}
.hero-subtitle {
  font-size: 1.05rem; color: var(--silver); max-width: 600px; line-height: 1.8;
  margin-bottom: 2.5rem; letter-spacing: 1px;
}
.hero-buttons { display: flex; gap: 1.5rem; flex-wrap: wrap; justify-content: center; }

.btn-gold {
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, #8b6914 0%, #c9a84c 30%, #f0d060 50%, #c9a84c 70%, #8b6914 100%);
  color: #1a1a1a; font-weight: 800; font-size: 0.95rem; text-decoration: none;
  letter-spacing: 2px; text-transform: uppercase; border: none; cursor: pointer;
  position: relative; overflow: hidden;
  box-shadow: 0 4px 20px rgba(201,168,76,0.3);
  transition: all 0.3s;
}
.btn-gold::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.3) 50%, transparent 60%);
  animation: shimmer-sweep 2.5s infinite;
}
.btn-gold:hover { box-shadow: 0 6px 30px rgba(201,168,76,0.5); transform: translateY(-2px); }

.btn-silver {
  padding: 1rem 2.5rem;
  background: transparent; border: 2px solid rgba(184,184,184,0.5);
  color: var(--silver); font-weight: 700; font-size: 0.95rem; text-decoration: none;
  letter-spacing: 2px; text-transform: uppercase;
  transition: all 0.3s; position: relative; overflow: hidden;
}
.btn-silver:hover { border-color: var(--gold-2); color: var(--gold-2); box-shadow: 0 0 20px rgba(201,168,76,0.2); }

/* ============ FEATURES ============ */
.features-section { position: relative; z-index: 1; padding: 5rem 1.5rem; max-width: 1280px; margin: 0 auto; }
.section-label {
  text-align: center; font-size: 0.75rem; letter-spacing: 6px; color: var(--gold-2);
  text-transform: uppercase; margin-bottom: 0.5rem;
}
.section-title {
  text-align: center; font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 900;
  margin-bottom: 3rem; letter-spacing: 1px;
  background: linear-gradient(180deg, #fef3c7, #c9a84c, #8b6914);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.feature-card {
  background: var(--bg-card); border: 1px solid rgba(184,184,184,0.15);
  padding: 2.5rem 2rem; text-align: center; transition: all 0.4s;
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-1), var(--gold-2), var(--gold-1), transparent);
  opacity: 0; transition: opacity 0.4s;
}
.feature-card:hover { border-color: rgba(201,168,76,0.5); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 30px rgba(201,168,76,0.08); }
.feature-card:hover::before { opacity: 1; }
.feature-icon { font-size: 2.5rem; margin-bottom: 1.2rem; display: block; }
.feature-card:nth-child(1) .feature-icon {
  background: linear-gradient(180deg, #f0d060, #c9a84c); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.feature-card:nth-child(2) .feature-icon {
  background: linear-gradient(180deg, #e8e8e8, #b8b8b8); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.feature-card:nth-child(3) .feature-icon {
  background: linear-gradient(180deg, #f0d060, #c9a84c); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.feature-card h3 { font-size: 1.15rem; font-weight: 800; margin-bottom: 0.75rem; color: var(--text-primary); letter-spacing: 1px; }
.feature-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ============ STATS ============ */
.stats-section { position: relative; z-index: 1; padding: 4rem 1.5rem; max-width: 1100px; margin: 0 auto; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.stat-item {
  background: var(--bg-card); border: 1px solid rgba(184,184,184,0.12);
  padding: 2rem 1.2rem; text-align: center; transition: all 0.3s;
  position: relative;
}
.stat-item:hover { border-color: rgba(201,168,76,0.4); }
.stat-item::after {
  content: ''; position: absolute; bottom: 0; left: 20%; right: 20%; height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-1), transparent);
  opacity: 0; transition: opacity 0.3s;
}
.stat-item:hover::after { opacity: 1; }
.stat-number {
  font-size: 2.5rem; font-weight: 900;
  background: linear-gradient(180deg, #fef3c7, #c9a84c);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1.1;
}
.stat-label { font-size: 0.85rem; color: var(--silver); margin-top: 0.5rem; letter-spacing: 1px; text-transform: uppercase; }

/* ============ TESTIMONIALS ============ */
.testimonials-section { position: relative; z-index: 1; padding: 5rem 1.5rem; max-width: 1280px; margin: 0 auto; }
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.testimonial-card {
  background: var(--bg-card); border: 1px solid rgba(184,184,184,0.12);
  padding: 2.5rem 2rem; transition: all 0.3s; position: relative;
}
.testimonial-card:hover { border-color: rgba(201,168,76,0.4); box-shadow: 0 8px 30px rgba(0,0,0,0.4); }
.testimonial-stars { color: var(--gold-1); margin-bottom: 1rem; font-size: 0.85rem; }
.testimonial-text { font-size: 0.95rem; color: var(--silver); line-height: 1.8; margin-bottom: 1.5rem; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 0.75rem; }
.testimonial-avatar { width: 48px; height: 48px; object-fit: cover; border: 2px solid rgba(201,168,76,0.4); }
.testimonial-name { font-weight: 800; color: var(--text-primary); font-size: 0.95rem; letter-spacing: 1px; }
.testimonial-role { font-size: 0.75rem; color: var(--text-secondary); letter-spacing: 1px; text-transform: uppercase; }

/* ============ FAQ ============ */
.faq-section { position: relative; z-index: 1; padding: 5rem 1.5rem; max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid rgba(184,184,184,0.1);
  margin-bottom: 0.5rem; overflow: hidden; transition: all 0.3s;
}
.faq-item:hover { border-color: rgba(201,168,76,0.3); }
.faq-question {
  padding: 1.3rem 1.5rem; cursor: pointer; display: flex;
  justify-content: space-between; align-items: center;
  font-weight: 700; color: var(--text-primary); font-size: 0.95rem;
  user-select: none; letter-spacing: 0.5px;
}
.faq-question i { transition: transform 0.3s; color: var(--gold-1); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 1.5rem; font-size: 0.9rem; color: var(--silver); line-height: 1.8;
}
.faq-item.open { border-color: rgba(201,168,76,0.5); background: #181818; }
.faq-item.open .faq-answer { max-height: 300px; padding: 0 1.5rem 1.25rem; }
.faq-item.open .faq-question i { transform: rotate(180deg); }

/* ============ CTA ============ */
.cta-section { position: relative; z-index: 1; text-align: center; padding: 5rem 1.5rem; }
.cta-metal {
  display: inline-block; background: var(--bg-card); padding: 3rem;
  max-width: 700px; border: 1px solid rgba(201,168,76,0.3);
  position: relative;
  box-shadow: 0 0 40px rgba(201,168,76,0.05), inset 0 0 40px rgba(201,168,76,0.02);
}
.cta-metal::before {
  content: ''; position: absolute; top: -1px; left: 5%; right: 5%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-1), var(--gold-2), var(--gold-1), transparent);
}
.cta-title { font-size: 2rem; font-weight: 900; color: var(--text-primary); margin-bottom: 1rem; letter-spacing: 1px; }
.cta-text { font-size: 1rem; color: var(--silver); margin-bottom: 2rem; line-height: 1.7; }

/* ============ FOOTER ============ */
.metal-footer {
  position: relative; z-index: 1;
  background: #0d0d0d; border-top: 1px solid rgba(201,168,76,0.2);
  padding: 3rem 1.5rem 1.5rem;
}
.metal-footer::before {
  content: ''; position: absolute; top: -1px; left: 10%; right: 10%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-1), var(--gold-2), var(--gold-1), transparent);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; max-width: 1280px; margin: 0 auto; }
.footer-col h4 { color: var(--gold-2); font-weight: 800; margin-bottom: 1rem; font-size: 0.9rem; letter-spacing: 2px; text-transform: uppercase; }
.footer-col p, .footer-col a { color: var(--silver-dark); font-size: 0.85rem; line-height: 2; text-decoration: none; display: block; transition: color 0.3s; }
.footer-col a:hover { color: var(--gold-2); }
.footer-bottom { text-align: center; color: #555; font-size: 0.8rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid rgba(184,184,184,0.08); max-width: 1280px; margin-left: auto; margin-right: auto; letter-spacing: 1px; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(10,10,10,0.98); flex-direction: column; padding: 1.5rem;
    border-bottom: 1px solid rgba(201,168,76,0.3); }
  .nav-links.active { display: flex; }
  .hamburger { display: flex; }
  .features-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-metal { padding: 2rem 1.5rem; }
}