/* ============================================
   DART MUTANT - Mutation Testing for Dart
   Theme: Toxic Lab / Bio-hazard Sci-Fi
   Colors: Toxic green, warning orange, dark backgrounds
   ============================================ */

/* CSS Custom Properties */
:root {
  /* Primary - Toxic Green (mutation/bio-hazard) */
  --color-primary: #39ff14;
  --color-primary-dark: #2ed10f;
  --color-primary-glow: rgba(57, 255, 20, 0.3);

  /* Secondary - Warning Orange (danger/alert) */
  --color-secondary: #ff6b35;
  --color-secondary-dark: #e55a2b;
  --color-secondary-glow: rgba(255, 107, 53, 0.3);

  /* Accent - Cyber Cyan */
  --color-accent: #00fff5;
  --color-accent-dark: #00d4cc;

  /* Status Colors */
  --color-killed: #39ff14;
  --color-survived: #ff6b35;
  --color-timeout: #ffd93d;
  --color-error: #ff3131;

  /* Backgrounds - Dark Lab */
  --bg-darkest: #0a0a0f;
  --bg-dark: #0f1117;
  --bg-medium: #161922;
  --bg-light: #1e222d;
  --bg-card: #1a1d26;

  /* Text */
  --text-primary: #e8e8e8;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Borders */
  --border-color: #2a2f3a;
  --border-glow: var(--color-primary);

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
  --font-display: 'Orbitron', var(--font-sans);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

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

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

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

/* Background Grid Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(57, 255, 20, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(57, 255, 20, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
}

p {
  color: var(--text-secondary);
  max-width: 70ch;
}

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

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

code,
pre {
  font-family: var(--font-mono);
}

code {
  background: var(--bg-medium);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: var(--color-primary);
}

pre {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  overflow-x: auto;
  position: relative;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.875rem;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-logo-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  font-size: 1.25rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-primary);
  color: var(--bg-darkest);
  box-shadow: 0 0 20px var(--color-primary-glow);
}

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

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-dark);
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-links.active {
    display: flex;
  }
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 70px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-primary-glow) 0%, transparent 70%);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.3;
    transform: translateX(-50%) scale(1);
  }

  50% {
    opacity: 0.5;
    transform: translateX(-50%) scale(1.1);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-light);
  border: 1px solid var(--border-color);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.hero-badge-icon {
  color: var(--color-primary);
}

.hero-title {
  margin-bottom: var(--spacing-lg);
}

.hero-title .highlight {
  color: var(--color-primary);
  text-shadow: 0 0 30px var(--color-primary-glow);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-3xl);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--bg-darkest);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--bg-darkest);
  box-shadow: 0 0 30px var(--color-primary-glow);
  transform: translateY(-2px);
}

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

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

/* Code Block Hero */
.hero-code {
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  text-align: left;
  max-width: 600px;
  margin: 0 auto;
  overflow: hidden;
}

.hero-code-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-medium);
  border-bottom: 1px solid var(--border-color);
}

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

.hero-code-dot:nth-child(1) {
  background: #ff5f57;
}

.hero-code-dot:nth-child(2) {
  background: #febc2e;
}

.hero-code-dot:nth-child(3) {
  background: #28c840;
}

.hero-code-title {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hero-code pre {
  margin: 0;
  border: none;
  border-radius: 0;
}

.hero-code .comment {
  color: var(--text-muted);
}

.hero-code .command {
  color: var(--color-primary);
}

.hero-code .output {
  color: var(--text-secondary);
}

.hero-code .highlight {
  color: var(--color-secondary);
}

/* Features Section */
.features {
  background: var(--bg-dark);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  margin: 0 auto;
  max-width: 600px;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary-glow), transparent);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

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

.feature-card p {
  font-size: 0.95rem;
}

/* Stats Section */
.stats {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darkest) 100%);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-xl);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
  text-shadow: 0 0 30px var(--color-primary-glow);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Mutation Operators Section */
.operators {
  background: var(--bg-darkest);
}

.operators-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.operators-table th,
.operators-table td {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.operators-table th {
  background: var(--bg-medium);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.operators-table tr:last-child td {
  border-bottom: none;
}

.operators-table tr:hover td {
  background: var(--bg-light);
}

.mutation-arrow {
  color: var(--color-secondary);
  font-weight: bold;
}

/* How It Works */
.how-it-works {
  background: var(--bg-dark);
}

.steps {
  display: grid;
  gap: var(--spacing-xl);
  max-width: 800px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-medium);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.step-content h3 {
  margin-bottom: var(--spacing-sm);
  font-family: var(--font-sans);
}

/* CTA Section */
.cta {
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darkest) 100%);
  text-align: center;
}

.cta-box {
  background: var(--bg-card);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3xl);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
}

.cta-box h2 {
  margin-bottom: var(--spacing-md);
}

.cta-box p {
  margin: 0 auto var(--spacing-xl);
}

/* Footer */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.footer-logo {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
}

.footer-links {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

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

.footer-link:hover {
  color: var(--color-primary);
}

.footer-copy {
  width: 100%;
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Mutation Score Demo */
.score-demo {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  max-width: 500px;
  margin: var(--spacing-2xl) auto 0;
}

.score-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.score-label {
  font-weight: 600;
}

.score-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-primary);
}

.score-bar {
  height: 8px;
  background: var(--bg-medium);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: var(--spacing-md);
}

.score-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: 100px;
  transition: width 1s ease;
}

.score-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.875rem;
}

.score-stat {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.score-stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.score-stat-dot.killed {
  background: var(--color-killed);
}

.score-stat-dot.survived {
  background: var(--color-survived);
}

.score-stat-dot.timeout {
  background: var(--color-timeout);
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-in {
  animation: fadeIn 0.6s ease forwards;
}

/* Utility Classes */
.text-gradient {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glow {
  text-shadow: 0 0 20px var(--color-primary-glow);
}

/* Responsive */
@media (max-width: 640px) {
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

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

  .step-number {
    margin: 0 auto;
  }

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

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}