/* ========================================
   0016 - DARK LUXURY 暗黑奢华风
   ======================================== */

/* Custom Properties */
:root {
  --dark-bg: #0f172a;
  --dark-card: #1e293b;
  --dark-border: #334155;
  --gold: #f59e0b;
  --gold-light: #fbbf24;
  --gold-dark: #d97706;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
}

/* Base */
html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--dark-bg);
  color: var(--text-primary);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
}

/* Navbar - Glass morphism */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(245, 158, 11, 0.15);
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.95);
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
}

.nav-link {
  color: var(--text-secondary);
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--gold);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold-light));
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 41, 59, 0.9) 50%, rgba(15, 23, 42, 0.95) 100%),
    url('https://images.unsplash.com/photo-1557682250-33bd709cbe85?w=1920&q=80') center/cover no-repeat;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 50%, rgba(245, 158, 11, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 30%, #d97706 60%, #fbbf24 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
}

.btn-gold {
  background: linear-gradient(135deg, #d97706, #f59e0b, #d97706);
  background-size: 200% 100%;
  color: #0f172a;
  font-weight: 700;
  padding: 0.875rem 2.5rem;
  border-radius: 9999px;
  transition: all 0.3s ease;
  animation: shimmer 3s ease-in-out infinite;
}

.btn-gold:hover {
  background-position: 100% 0;
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.5), 0 0 60px rgba(245, 158, 11, 0.2);
  transform: translateY(-2px);
}

.btn-gold-outline {
  border: 2px solid var(--gold);
  color: var(--gold);
  font-weight: 700;
  padding: 0.875rem 2.5rem;
  border-radius: 9999px;
  transition: all 0.3s ease;
}

.btn-gold-outline:hover {
  background: var(--gold);
  color: #0f172a;
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.4);
  transform: translateY(-2px);
}

@keyframes shimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* Features Cards */
.feature-card {
  background: var(--dark-card);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 1rem;
  padding: 2rem;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card:hover {
  border-color: rgba(245, 158, 11, 0.5);
  transform: translateY(-4px);
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.15), 0 10px 40px rgba(0, 0, 0, 0.4);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(217, 119, 6, 0.1));
  border-radius: 12px;
  color: var(--gold);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

/* Stats */
.stats-section {
  background: linear-gradient(180deg, #0f172a 0%, #1a1f2e 100%);
  position: relative;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.stat-number {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Testimonials */
.testimonial-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 1rem;
  padding: 1.75rem;
  transition: all 0.3s ease;
}

.testimonial-card:hover {
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.stars-gold {
  color: var(--gold);
}

/* FAQ Accordion */
.faq-item {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 0.75rem;
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active {
  border-color: rgba(245, 158, 11, 0.4);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  user-select: none;
}

.faq-icon {
  color: var(--gold);
  transition: transform 0.3s ease;
  font-size: 0.875rem;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 1.5rem 1.25rem;
}

/* CTA Section */
.cta-section {
  background: linear-gradient(135deg, #0f172a 0%, #1a1f2e 50%, #0f172a 100%);
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(245, 158, 11, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

/* Footer */
.footer {
  background: #0a0f1a;
  border-top: 1px solid rgba(245, 158, 11, 0.1);
}

/* Floating particles */
.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--gold);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
  opacity: 0.3;
}

@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  25% { transform: translateY(-30px) translateX(10px); }
  50% { transform: translateY(-15px) translateX(-10px); }
  75% { transform: translateY(-40px) translateX(5px); }
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
  background: var(--dark-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gold-dark);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }

  .feature-card {
    padding: 1.5rem;
  }

  .stat-number {
    font-size: 2.25rem;
  }
}