/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%; }
body { font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: #f0f0f0; background: #1a0a2e; }

/* CSS Variables */
:root {
  --color-bg: #1a0a2e;
  --color-card: #2a1a4e;
  --color-grad: linear-gradient(135deg, #d4af37, #f0e68c);
  --color-accent: #39ff14;
  --color-gold: #f5e6a3;
  --color-purple-dark: #0d0520;
  --color-text: #f0f0f0;
  --color-title: #f5e6a3;
  --color-heading: #f5e6a3;
  --font-heading: 'Montserrat', -apple-system, 'PingFang SC', sans-serif;
  --font-body: 'Inter', -apple-system, 'PingFang SC', sans-serif;
  --font-accent: 'Orbitron', monospace;
  --max-width: 1200px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  --border-radius: 8px;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  z-index: 10000;
  background: var(--color-grad);
  color: #1a0a2e;
  padding: 0.5rem 1rem;
  font-weight: bold;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  height: 60px;
  background: var(--color-purple-dark);
  backdrop-filter: blur(4px);
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}
.brand-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.5rem;
  background: var(--color-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 10px rgba(212,175,55,0.5);
  text-decoration: none;
  letter-spacing: 2px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--color-gold);
  border-radius: 4px;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-gold);
  margin: 3px 0;
  transition: transform 0.3s, opacity 0.3s;
}
.site-nav ul {
  list-style: none;
  display: flex;
  gap: var(--space-xs);
}
.site-nav a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--color-text);
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: color 0.2s, text-shadow 0.2s;
  border-radius: 4px;
}
.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-accent);
  text-shadow: 0 0 8px var(--color-accent);
}
.site-nav a[aria-current="page"] {
  color: var(--color-gold);
  background: rgba(57,255,20,0.1);
  box-shadow: inset 0 -2px 0 var(--color-accent);
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed;
    top: 60px;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--color-purple-dark);
    border-right: 2px solid var(--color-gold);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    padding: var(--space-md);
  }
  .site-nav[data-open="true"] {
    transform: translateX(0);
  }
  .site-nav ul {
    flex-direction: column;
    gap: var(--space-sm);
  }
  .site-nav a {
    font-size: 1.1rem;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid rgba(212,175,55,0.2);
  }
}

/* Footer */
.site-footer {
  background: var(--color-purple-dark);
  padding: var(--space-lg) var(--space-md) var(--space-md);
  color: var(--color-text);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  justify-content: space-between;
}
.footer-brand { flex: 1 1 300px; }
.footer-trust { font-size: 0.85rem; margin-top: var(--space-xs); opacity: 0.8; }
.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: var(--color-gold); text-decoration: none; }
.footer-links a:hover { color: var(--color-accent); }
.footer-contact { display: flex; flex-direction: column; font-size: 0.9rem; opacity: 0.8; }
.footer-icp { font-size: 0.75rem; opacity: 0.6; margin-top: var(--space-sm); text-align: center; width: 100%; }
.footer-copy { text-align: center; margin-top: var(--space-md); font-size: 0.8rem; opacity: 0.5; }

/* Progress bar */
.progress-bar[data-scroll-progress] {
  position: fixed;
  top: 60px;
  left: 0;
  height: 3px;
  background: var(--color-grad);
  z-index: 999;
  width: 0%;
  transition: width 0.1s linear;
}

/* Common components */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: var(--color-grad);
  color: #1a0a2e;
  font-family: var(--font-heading);
  font-weight: 700;
  border: none;
  border-radius: var(--border-radius);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 10px rgba(212,175,55,0.3);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 4px 20px rgba(57,255,20,0.4); }
.btn:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

.card {
  background: var(--color-card);
  padding: var(--space-md);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--color-gold);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(106,13,173,0.5); }

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--color-title);
  text-shadow: 0 0 15px rgba(212,175,55,0.4), 0 0 30px rgba(212,175,55,0.2);
  margin-bottom: var(--space-sm);
  background: var(--color-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.breadcrumb {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: var(--space-sm);
}
.breadcrumb a, .breadcrumb span { color: var(--color-gold); }
.breadcrumb a:hover { color: var(--color-accent); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 { grid-template-columns: 1fr 1fr; }
}

/* Placeholder for images (abstract geometric) */
.img-placeholder {
  background: linear-gradient(45deg, #6a0dad, #2a1a4e);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 16/9;
  color: var(--color-gold);
  font-family: var(--font-accent);
  font-size: 0.9rem;
  border: 1px dashed rgba(212,175,55,0.4);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
  .site-nav { transition: none; }
}

/* Focus visible */
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* Main content offset for fixed header */
#main-content { padding-top: 60px; }