/* ============================================
   Karl AI — Design System
   Created by RizzyFuzz
   Dark Typography Theme
   ============================================ */

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

:root {
  /* Colors */
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1629;
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --border: rgba(99, 102, 241, 0.15);
  --border-hover: rgba(99, 102, 241, 0.35);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #818cf8;
  --accent-secondary: #6366f1;
  --accent-tertiary: #a78bfa;
  --accent-glow: rgba(99, 102, 241, 0.25);

  --green: #34d399;
  --blue: #60a5fa;
  --pink: #f472b6;
  --amber: #fbbf24;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --nav-height: 72px;
  --section-padding: 120px;
  --container-max: 1200px;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 0.3s;
}

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;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

/* --- Animated Background --- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  z-index: 0;
  pointer-events: none;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.4;
  pointer-events: none;
  z-index: 0;
}

.bg-glow-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.3), transparent 70%);
  top: -200px;
  left: -100px;
  animation: float1 20s ease-in-out infinite;
}

.bg-glow-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(167, 139, 250, 0.2), transparent 70%);
  bottom: -150px;
  right: -100px;
  animation: float2 25s ease-in-out infinite;
}

.bg-glow-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(52, 211, 153, 0.15), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: float3 30s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(80px, 60px); }
  66% { transform: translate(-40px, 100px); }
}

@keyframes float2 {
  0%, 100% { transform: translate(0, 0); }
  33% { transform: translate(-60px, -80px); }
  66% { transform: translate(40px, -40px); }
}

@keyframes float3 {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.2); }
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  backdrop-filter: blur(20px);
  background: rgba(10, 14, 26, 0.8);
  border-bottom: 1px solid var(--border);
  transition: background var(--duration) var(--ease);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.3rem;
}

.nav-icon {
  display: flex;
  align-items: center;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

.nav-name {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--duration) var(--ease);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width var(--duration) var(--ease);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-btn {
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  color: white;
  transition: all var(--duration) var(--ease);
  box-shadow: 0 4px 15px var(--accent-glow);
}

.nav-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(99, 102, 241, 0.4);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--nav-height) + 40px) 32px 80px;
  position: relative;
  z-index: 1;
}

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

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent-primary);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s var(--ease);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s var(--ease) 0.1s both;
}

.title-line {
  display: block;
  color: var(--text-primary);
}

.title-gradient {
  display: block;
  background: linear-gradient(135deg, var(--accent-tertiary), var(--accent-primary), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 5s ease-in-out infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.8;
  animation: fadeInUp 0.8s var(--ease) 0.2s both;
}

.highlight {
  color: var(--accent-primary);
  font-weight: 700;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
  animation: fadeInUp 0.8s var(--ease) 0.3s both;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--duration) var(--ease);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-secondary), var(--accent-primary));
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

/* --- Hero Stats --- */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  animation: fadeInUp 0.8s var(--ease) 0.4s both;
}

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

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* --- Sections --- */
.section {
  padding: var(--section-padding) 32px;
  position: relative;
  z-index: 1;
}

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

.section-inner {
  max-width: var(--container-max);
  margin: 0 auto;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 64px;
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: all var(--duration) var(--ease);
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid var(--border);
  border-radius: 14px;
  animation: bounce 3s ease-in-out infinite;
  transition: all var(--duration) var(--ease);
}

.feature-card:hover .feature-icon {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--border-hover);
}

.feature-card:nth-child(2) .feature-icon { animation-delay: 0.3s; }
.feature-card:nth-child(3) .feature-icon { animation-delay: 0.6s; }
.feature-card:nth-child(4) .feature-icon { animation-delay: 0.9s; }
.feature-card:nth-child(5) .feature-icon { animation-delay: 1.2s; }
.feature-card:nth-child(6) .feature-icon { animation-delay: 1.5s; }

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Mode Cards --- */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.mode-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: 20px 20px 0 0;
  transition: height 0.4s var(--ease);
}

.mode-coding::before { background: linear-gradient(90deg, var(--accent-primary), var(--green)); }
.mode-mental::before { background: linear-gradient(90deg, var(--blue), var(--pink)); }
.mode-search::before { background: linear-gradient(90deg, var(--amber), var(--accent-primary)); }

.mode-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

.mode-card:hover::before {
  height: 4px;
}

.mode-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.mode-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: all var(--duration) var(--ease);
}

.mode-card:hover .mode-icon {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--border-hover);
  transform: scale(1.05);
}

.mode-badge {
  padding: 6px 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.mode-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.mode-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.mode-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 12px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.12);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Code Tabs --- */
.code-tabs {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.tab-buttons {
  display: flex;
  background: rgba(15, 23, 42, 0.5);
  border-bottom: 1px solid var(--border);
  padding: 4px;
  gap: 4px;
}

.tab-btn {
  flex: 1;
  padding: 12px 20px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 10px;
  transition: all var(--duration) var(--ease);
}

.tab-btn:hover {
  color: var(--text-secondary);
  background: rgba(99, 102, 241, 0.05);
}

.tab-btn.active {
  color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.tab-content {
  display: none;
  padding: 24px;
}

.tab-content.active {
  display: block;
}

.tab-content pre {
  background: transparent;
  margin: 0;
  overflow-x: auto;
}

.tab-content code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.code-comment { color: var(--text-muted); }
.code-cmd { color: var(--green); font-weight: 600; }
.code-str { color: var(--amber); }
.code-keyword { color: var(--accent-primary); }
.code-func { color: var(--blue); }

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border);
  padding: 60px 32px;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-logo {
  -webkit-text-fill-color: initial;
  display: flex;
  align-items: center;
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

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

.footer-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--duration) var(--ease);
}

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

.footer-sep {
  color: var(--text-muted);
}

.footer-copy {
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* --- Animations --- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Responsive --- */
@media (max-width: 968px) {
  .features-grid,
  .modes-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-links {
    gap: 20px;
  }
}

@media (max-width: 640px) {
  .features-grid,
  .modes-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .hero-stats {
    gap: 24px;
  }

  .hero-title {
    font-size: 2.8rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .section {
    padding: 80px 20px;
  }
}