/* Design System */
:root {
  --bg-dark: #0a0e1a;
  --bg-gradient-start: #0f1629;
  --bg-gradient-end: #050810;
  --surface: rgba(255, 255, 255, 0.03);
  --surface-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.08);
  
  --text-primary: #e6eef9;
  --text-secondary: #9aa5b8;
  --text-muted: #6b7280;
  
  --accent: #60a5fa;
  --accent-bright: #93c5fd;
  --accent-dark: #3b82f6;
  --gradient-blue: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
  
  --success: #34d399;
  --warning: #fbbf24;
  
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Light Theme */
[data-theme="light"] {
  --bg-dark: #f8fafc;
  --bg-gradient-start: #ffffff;
  --bg-gradient-end: #f1f5f9;
  --surface: rgba(255, 255, 255, 0.8);
  --surface-hover: rgba(255, 255, 255, 1);
  --border: rgba(0, 0, 0, 0.1);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent: #2563eb;
  --accent-bright: #3b82f6;
  --accent-dark: #1d4ed8;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

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

html {
  scroll-behavior: smooth;
  overflow-y: scroll;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-dark);
  background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
  background-attachment: fixed;
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Ensure anchored sections appear below the sticky header */
[id] {
  scroll-margin-top: 88px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 26, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-md) 0;
}

[data-theme="light"] .navbar {
  background: rgba(255, 255, 255, 0.85);
}

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

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

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

[data-theme="light"] .nav-links a {
  color: #1e293b;
}

.nav-links a:hover {
  color: var(--accent-bright);
}

/* GitHub Nav Button */
.btn-github-nav {
  background: #24292f;
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all 0.2s;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-github-nav:hover {
  background: #32383f;
  transform: translateY(-1px);
}

[data-theme="light"] .btn-github-nav {
  background: transparent;
  color: #24292f;
  border: 1px solid #24292f;
}

[data-theme="light"] .btn-github-nav:hover {
  background: rgba(36, 41, 47, 0.05);
}

/* Theme Toggle */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-secondary);
}

.theme-toggle:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  color: var(--accent-bright);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
  position: absolute;
  transition: all 0.3s;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

[data-theme="dark"] .theme-toggle .moon-icon {
  opacity: 0;
  transform: rotate(180deg) scale(0);
}

[data-theme="light"] .theme-toggle .sun-icon {
  opacity: 0;
  transform: rotate(-180deg) scale(0);
}

[data-theme="light"] .theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* Hero Section */
.hero {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-xl);
}

.hero-badges {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0.8;
}

.hero-badges a {
  display: inline-block;
  transition: transform 0.2s, opacity 0.2s;
  text-decoration: none;
}

.hero-badges a:hover {
  transform: translateY(-2px);
  opacity: 1;
}

.hero-badges img {
  height: 20px;
}

/* Buttons */
.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.125rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all 0.2s;
}

.btn-primary {
  background: var(--gradient-blue);
  color: white;
  box-shadow: var(--shadow-sm);
}

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

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

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

.btn-github {
  background: #24292f;
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-sm);
}

.btn-github:hover {
  background: #32383f;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-github svg {
  flex-shrink: 0;
}

.btn-github-nav {
  background: #24292f;
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-sm);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.btn-github-nav:hover {
  background: #32383f;
  transform: translateY(-1px);
}

/* Sections */
.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.features-section {
  padding: var(--spacing-3xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all 0.3s;
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

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

/* Quick Start Section */
.quickstart-section {
  padding: var(--spacing-3xl) 0;
  background: rgba(0, 0, 0, 0.2);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-top: calc(var(--spacing-md) * -1);
  margin-bottom: var(--spacing-2xl);
}

.steps-container {
  max-width: 900px;
  margin: 0 auto;
}

.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
  transition: all 0.3s;
}

.step-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateX(8px);
}

.step-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.step-number {
  width: 48px;
  height: 48px;
  background: var(--gradient-blue);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.step-card h3 {
  font-size: 1.5rem;
  margin: 0;
}

.step-description {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.step-visual {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  font-family: 'Fira Code', 'JetBrains Mono', monospace;
}

[data-theme="light"] .step-visual {
  background: rgba(96, 165, 250, 0.08);
}

.step-substeps {
  background: rgba(0, 0, 0, 0.2);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

[data-theme="light"] .step-substeps {
  background: rgba(96, 165, 250, 0.08);
}

.substep {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  align-items: flex-start;
}

.substep:last-child {
  margin-bottom: 0;
}

.substep-label {
  background: var(--accent);
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.substep span:last-child {
  flex: 1;
  padding-top: 2px;
}

.step-note {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(96, 165, 250, 0.05);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
}

.step-connector {
  width: 2px;
  height: var(--spacing-lg);
  background: linear-gradient(180deg, var(--border) 0%, transparent 100%);
  margin: 0 auto;
  margin-left: 23px;
}

/* Command Examples */
.command-examples {
  margin-top: var(--spacing-2xl);
}

.command-examples h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.command-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.command-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.command-item code {
  color: var(--accent-bright);
  font-weight: 600;
}

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

/* CTA Section */
.cta-section {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.cta-section h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.cta-section p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.cta-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* Code Blocks */
code {
  background: rgba(0, 0, 0, 0.3);
  color: var(--accent-bright);
  padding: 3px 8px;
  border-radius: 6px;
  font-family: 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9em;
}

[data-theme="light"] code {
  background: rgba(0, 0, 0, 0.06);
  color: var(--accent-dark);
}

pre {
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

[data-theme="light"] pre {
  background: rgba(0, 0, 0, 0.04);
}

pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

/* Footer */
.site-footer {
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  margin-top: var(--spacing-3xl);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .nav-links a:not(.btn-primary) {
    display: none;
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .features-grid,
  .command-grid {
    grid-template-columns: 1fr;
  }
  
  .step-card:hover {
    transform: none;
  }
  
  .step-connector {
    margin-left: calc(var(--spacing-lg) + 4px);
  }
  
  .hero-actions,
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-large {
    width: 100%;
    text-align: center;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-sm) 0;
  }
  
  .nav-brand {
    font-size: 1rem;
  }
  
  .hero-badges {
    flex-direction: column;
    align-items: center;
  }
}