/* Chat Utilities Website - Premium Dark Theme */

:root {
  /* Colors */
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-tertiary: #18181b;
  --bg-card: #1c1c1f;
  --bg-card-hover: #242428;

  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;

  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-subtle: rgba(59, 130, 246, 0.1);
  --accent-glow: rgba(59, 130, 246, 0.15);

  --border: #27272a;
  --border-subtle: #1f1f23;

  --gradient-start: #3b82f6;
  --gradient-end: #8b5cf6;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Spacing */
  --container-width: 1200px;
  --container-narrow: 800px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Background gradient effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100vh;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow), transparent),
    radial-gradient(ellipse 60% 40% at 80% 0%, rgba(139, 92, 246, 0.08), transparent);
  pointer-events: none;
  z-index: -1;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }

p {
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.nav__logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  /* border-radius: var(--radius-md); */
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.nav__logo-img {
  width: 36px;
  height: 36px;
  /* border-radius: var(--radius-md); */
  object-fit: cover;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--text-primary);
}

.nav__cta {
  padding: 10px 20px;
  background: var(--text-primary);
  color: var(--bg-primary);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.nav__cta:hover {
  background: var(--text-secondary);
  color: var(--bg-primary);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--accent);
  margin-bottom: 24px;
}

.hero__title {
  margin-bottom: 24px;
  background: linear-gradient(to bottom, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 40px;
  color: var(--text-secondary);
}

.hero__buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(59, 130, 246, 0.4);
  color: white;
}

.btn--secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn--secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-tertiary);
  color: var(--text-primary);
}

/* Features Section */
.features {
  padding: 100px 0;
}

.features__header {
  text-align: center;
  margin-bottom: 64px;
}

.features__header h2 {
  margin-bottom: 16px;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-tertiary);
  transform: translateY(-4px);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  background: var(--accent-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card__title {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.feature-card__description {
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Models Section */
.models {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.models__header {
  text-align: center;
  margin-bottom: 48px;
}

.models__logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  opacity: 0.7;
}

.models__logo {
  padding: 16px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* CTA Section */
.cta {
  padding: 100px 0;
  text-align: center;
}

.cta__card {
  padding: 64px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(139, 92, 246, 0.1));
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-xl);
}

.cta__card h2 {
  margin-bottom: 16px;
}

.cta__card p {
  margin-bottom: 32px;
  font-size: 1.1rem;
}

/* Footer */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer__brand p {
  margin-top: 16px;
  font-size: 0.9rem;
}

.footer__column h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: 20px;
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer__links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer__links a:hover {
  color: var(--text-primary);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* Page Header */
.page-header {
  padding: 140px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  margin-bottom: 16px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.page-header p {
  font-size: 1.1rem;
}

/* Content Section */
.content {
  padding: 80px 0;
}

.content h2 {
  margin-top: 48px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.content h2:first-child {
  margin-top: 0;
}

.content h3 {
  margin-top: 32px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.content p {
  margin-bottom: 16px;
}

.content ul, .content ol {
  margin-bottom: 16px;
  padding-left: 24px;
  color: var(--text-secondary);
}

.content li {
  margin-bottom: 8px;
}

.content strong {
  color: var(--text-primary);
}

.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.content th, .content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.content th {
  color: var(--text-primary);
  font-weight: 600;
  background: var(--bg-secondary);
}

.content td {
  color: var(--text-secondary);
}

.content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  background: var(--bg-tertiary);
  border-radius: 4px;
}

.content pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}

.content pre code {
  background: none;
  padding: 0;
}

/* Support Cards */
.support-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 48px 0;
}

.support-card {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-base);
}

.support-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.support-card__icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.support-card__title {
  margin-bottom: 12px;
}

.support-card__description {
  font-size: 0.95rem;
  margin-bottom: 20px;
}

/* FAQ */
.faq {
  margin-top: 64px;
}

.faq__item {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

.faq__question {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.faq__answer {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Privacy Actions */
.privacy-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.privacy-action {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.privacy-action__title {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

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

/* Info Box */
.info-box {
  padding: 20px 24px;
  background: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-md);
  margin: 24px 0;
}

.info-box--warning {
  background: rgba(234, 179, 8, 0.1);
  border-color: rgba(234, 179, 8, 0.2);
}

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

/* Mobile Menu Toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 968px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__toggle {
    display: block;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero__buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
    justify-content: center;
  }

  .footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .cta__card {
    padding: 40px 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .feature-card {
    padding: 24px;
  }

  .content {
    padding: 48px 0;
  }
}