:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #131a2a;
  --bg-card: rgba(22, 30, 48, 0.7);
  --bg-card-hover: rgba(30, 42, 66, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(0, 174, 236, 0.35);
  
  --bili-blue: #00aeec;
  --bili-blue-light: #4cd3ff;
  --bili-pink: #fb7299;
  --bili-pink-light: #ff91b2;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --gradient-bili: linear-gradient(135deg, #00aeec 0%, #fb7299 100%);
  --gradient-glow: linear-gradient(135deg, rgba(0, 174, 236, 0.15) 0%, rgba(251, 114, 153, 0.15) 100%);
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 12px 32px -4px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(0, 174, 236, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Ambient Glows */
.ambient-glow-1 {
  position: fixed;
  top: -150px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 174, 236, 0.18) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(50px);
}

.ambient-glow-2 {
  position: fixed;
  bottom: -150px;
  left: -100px;
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(251, 114, 153, 0.15) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: -1;
  pointer-events: none;
  filter: blur(60px);
}

/* Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.3px;
}

.logo img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  box-shadow: 0 2px 10px rgba(0, 174, 236, 0.3);
}

.logo span {
  background: var(--gradient-bili);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-links a.btn-cta {
  background: var(--gradient-bili);
  color: #fff;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(0, 174, 236, 0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}

.nav-links a.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 174, 236, 0.45);
}

/* Main Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 4rem 1rem 5rem;
  position: relative;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(0, 174, 236, 0.1);
  border: 1px solid rgba(0, 174, 236, 0.25);
  border-radius: var(--radius-full);
  color: var(--bili-blue-light);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 1.25rem;
  max-width: 850px;
  margin-left: auto;
  margin-right: auto;
}

.hero h1 .highlight {
  background: var(--gradient-bili);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--gradient-bili);
  color: #ffffff;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-glow);
  transition: all 0.25s ease;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 0 30px rgba(251, 114, 153, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Features Grid */
.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.5rem;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.grid-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 5rem;
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(0, 174, 236, 0.1);
  border: 1px solid rgba(0, 174, 236, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
  color: var(--bili-blue-light);
}

.card.pink .card-icon {
  background: rgba(251, 114, 153, 0.1);
  border-color: rgba(251, 114, 153, 0.2);
  color: var(--bili-pink-light);
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Privacy Policy Layout */
.privacy-container {
  max-width: 860px;
  margin: 2rem auto 5rem;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.privacy-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.privacy-header h1 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.privacy-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.privacy-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--bili-blue-light);
  margin: 2rem 0 0.75rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.privacy-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 1.25rem 0 0.5rem;
}

.privacy-content p, 
.privacy-content ul {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.privacy-content ul {
  padding-left: 1.5rem;
}

.privacy-content li {
  margin-bottom: 0.5rem;
}

.privacy-box {
  background: rgba(0, 174, 236, 0.06);
  border-left: 4px solid var(--bili-blue);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
}

.privacy-box p {
  color: var(--text-primary);
  margin-bottom: 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: rgba(11, 15, 25, 0.95);
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--bili-blue-light);
}

.footer-credit {
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  
  .privacy-container {
    padding: 1.75rem;
  }
  
  .nav-links {
    gap: 0.75rem;
  }
}