:root {
  --bg: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.7);
  --header-bg: rgba(15, 23, 42, 0.85);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.5);
  --border: rgba(255, 255, 255, 0.1);
  --radius: 24px;
  --font-main: system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg);
  background-image:
    radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 0%, rgba(139, 92, 246, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.1) 0px, transparent 50%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Layout Wrappers */
.page-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding-bottom: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.5rem;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.4);
}

.site-footer p {
  margin: 0;
  opacity: 0.6;
}

/* Language Switcher */
.lang-switcher {
  background: #1e293b;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  display: flex;
  height: 40px;
  box-sizing: border-box;
  align-items: center;
}

.lang-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 0 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  height: 100%;
  display: flex;
  align-items: center;
}

.lang-btn.active {
  background: var(--accent);
  color: white;
}

/* Common Header/Footer/Layout Classes */
.btn-play-google {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: #1e293b;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  text-decoration: none;
  padding: 0.6rem 1.2rem;
  font-size: 0.9rem;
  font-weight: 600;
  height: 40px;
  box-sizing: border-box;
  transition: all 0.2s;
}
.btn-play-google:hover {
  transform: translateY(-1px);
  background-color: #334155;
  border-color: #94a3b8;
}

.header-inner {
  max-width: 1024px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.logo-title-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
}
.app-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  background: #1e293b;
  object-fit: cover;
}
.app-title {
  font-size: 1.25rem;
  font-weight: 700;
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.play-text {
  display: inline;
}
.main-article-wrapper {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}
.content-card-custom {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  margin-bottom: 1.5rem;
  animation: fadeIn 0.5s ease-out;
}

/* Typography elements */
.content-card-custom .link {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.content-card-custom .link:hover {
  border-color: var(--accent);
}
.content-card-custom h1 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.content-card-custom h2 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--text-primary);
}
.content-card-custom h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--text-primary);
}
.content-card-custom p,
.content-card-custom ul {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}
.content-card-custom ul {
  padding-left: 1.5rem;
}
.content-card-custom li {
  margin-bottom: 0.5rem;
}
.content-card-custom strong {
  color: var(--text-primary);
}
.content-card-custom code {
  background: rgba(0, 0, 0, 0.3);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-family: monospace;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* Policy links */
.policy-links-container {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.policy-links-stack {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.policy-link-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9em;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(0, 0, 0, 0.2);
  transition: all 0.2s;
}
.policy-link-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border-color: var(--accent-glow);
}
.policy-link-item i {
  width: 24px;
  text-align: center;
  color: var(--accent);
  font-size: 1.1em;
}

/* Dev Badge */
.dev-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 0.85em;
  color: #93c5fd;
  margin-top: 0.5rem;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .play-text {
    display: none;
  }
  .btn-play-google {
    padding: 0.6rem;
  }
  .app-logo {
    width: 32px;
    height: 32px;
  }
  .app-title {
    font-size: 1.1rem;
  }
  .header-inner {
    gap: 0.5rem;
  }
  .logo-title-group {
    gap: 0.5rem;
  }
  .content-card-custom {
    padding: 1.5rem;
    margin-bottom: 1.5rem;
  }
  .main-article-wrapper {
    margin: 1rem auto;
  }
}