/* LLM Proxy - Landing Page Styles */
/* Google-inspired: clean, minimal, generous whitespace */

:root {
  --color-primary: #1a73e8;
  --color-primary-hover: #1557b0;
  --color-text: #202124;
  --color-text-secondary: #5f6368;
  --color-surface: #ffffff;
  --color-background: #f8f9fa;
  --color-border: #dadce0;
  --color-accent: #34a853;
  --font-sans: 'Google Sans', 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Google Sans Mono', 'SF Mono', 'Fira Code', monospace;
  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.1), 0 1px 3px 1px rgba(60, 64, 67, 0.08);
  --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.15), 0 4px 8px 3px rgba(60, 64, 67, 0.1);
  --shadow-lg: 0 4px 8px 0 rgba(60, 64, 67, 0.15), 0 8px 16px 4px rgba(60, 64, 67, 0.1);
  --radius: 8px;
  --radius-lg: 16px;
  --max-width: 1200px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}

.nav-logo img {
  height: 32px;
  width: auto;
}

.nav-logo span {
  font-size: 1.125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  text-decoration: none;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 24px;
  transition: background var(--transition), color var(--transition);
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--color-primary);
  color: #fff !important;
  border-radius: 24px;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), box-shadow var(--transition);
}

.nav-cta:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
}

.nav-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--color-text-secondary);
}

/* Hero */
.hero {
  padding: 160px 24px 120px;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: #e8f0fe;
  color: var(--color-primary);
  border-radius: 24px;
  font-size: 0.8125rem;
  font-weight: 500;
  margin-bottom: 32px;
}

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 24px;
}

.hero h1 strong {
  font-weight: 600;
}

.hero p {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: transparent;
  color: var(--color-primary);
  text-decoration: none;
  border-radius: 28px;
  font-size: 1rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

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

/* Code Preview */
.code-preview {
  max-width: 720px;
  margin: 80px auto 0;
  background: #1e1e2e;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  text-align: left;
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dot:nth-child(1) { background: #ff5f57; }
.code-dot:nth-child(2) { background: #febc2e; }
.code-dot:nth-child(3) { background: #28c840; }

.code-header span {
  margin-left: auto;
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.4);
  font-family: var(--font-mono);
}

.code-body {
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: #cdd6f4;
  overflow-x: auto;
}

.code-body .keyword { color: #cba6f7; }
.code-body .string { color: #a6e3a1; }
.code-body .comment { color: #6c7086; }
.code-body .function { color: #89b4fa; }
.code-body .variable { color: #f9e2af; }

/* Features Section */
.section {
  padding: 120px 24px;
}

.section-alt {
  background: var(--color-background);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 72px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: box-shadow var(--transition), transform var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
}

.feature-icon.blue { background: #e8f0fe; }
.feature-icon.green { background: #e6f4ea; }
.feature-icon.orange { background: #fef7e0; }
.feature-icon.red { background: #fce8e6; }
.feature-icon.purple { background: #f3e8fd; }
.feature-icon.teal { background: #e0f7fa; }

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* How It Works */
.steps {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 32px 0;
  position: relative;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 500;
  position: relative;
}

.step:not(:last-child) .step-number::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: calc(100% + 16px);
  background: var(--color-border);
}

.step-content h3 {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

/* Pricing / CTA Section */
.cta-section {
  padding: 120px 24px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-background) 100%);
}

.cta-card {
  max-width: 640px;
  margin: 0 auto;
  padding: 64px 48px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.cta-card h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 400;
  margin-bottom: 16px;
}

.cta-card p {
  color: var(--color-text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 36px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 24px;
  background: var(--color-surface);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand img {
  height: 24px;
  width: auto;
}

.footer-brand span {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-menu-btn {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    box-shadow: var(--shadow-md);
  }

  .hero {
    padding: 120px 20px 80px;
  }

  .code-preview {
    margin: 48px auto 0;
    border-radius: var(--radius);
  }

  .section {
    padding: 80px 20px;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 32px 24px;
  }

  .step {
    gap: 20px;
  }

  .cta-card {
    padding: 40px 24px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }
}