/* LeetGitSyncPro — Design System & Landing Page Styles */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Outfit:wght@500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg-dark: #07090e;
  --bg-card: rgba(18, 22, 34, 0.7);
  --bg-card-hover: rgba(26, 32, 48, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(16, 185, 129, 0.4);
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --primary: #10b981;
  --primary-glow: rgba(16, 185, 129, 0.25);
  --primary-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --radius-lg: 16px;
  --radius-md: 10px;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Background Glowing Orbs */
.bg-glow-orb {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.15;
}
.glow-1 { top: -150px; left: 50%; transform: translateX(-50%); background: #10b981; }
.glow-2 { top: 40%; right: -200px; background: #06b6d4; }
.glow-3 { bottom: 10%; left: -200px; background: #8b5cf6; }

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 9, 14, 0.75);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 1.5rem;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.brand-logo {
  width: 38px;
  height: 38px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 60%, #10b981 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.65rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  font-weight: 700;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.btn-cta {
  background: var(--primary-gradient);
  color: #ffffff;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 4px 14px var(--primary-glow);
  transition: all 0.2s ease;
}

.btn-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Hero Section */
.hero {
  padding: 6rem 0 4rem;
  text-align: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.gradient-text {
  background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Feature Grid */
.features-section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
  backdrop-filter: blur(12px);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-active);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.6;
}

/* Code / Preview Box */
.preview-showcase {
  margin: 3rem 0 5rem;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.preview-header {
  background: #161b22;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #30363d;
}

.window-dots {
  display: flex;
  gap: 6px;
}

.window-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.preview-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.preview-body {
  padding: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #c9d1d9;
  overflow-x: auto;
  line-height: 1.7;
}

/* Legal / Policy Prose */
.legal-container {
  max-width: 800px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

.legal-header {
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.5rem;
}

.legal-header h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.legal-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

.legal-body h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: #ffffff;
  margin: 2rem 0 0.75rem;
}

.legal-body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #e6edf3;
  margin: 1.5rem 0 0.5rem;
}

.legal-body p, .legal-body ul {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.legal-body ul {
  padding-left: 1.5rem;
}

.legal-body li {
  margin-bottom: 0.5rem;
}

.legal-body a {
  color: var(--primary);
  text-decoration: underline;
}

/* Contact Form */
.contact-card {
  max-width: 580px;
  margin: 3rem auto 6rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  background: #0d1117;
  border: 1px solid #30363d;
  color: #f0f6fc;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--primary);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-status {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  margin-bottom: 1rem;
  display: none;
}
.form-status.success {
  display: block;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--primary);
  color: #34d399;
}
.form-status.error {
  display: block;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid #ef4444;
  color: #f87171;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  background: rgba(7, 9, 14, 0.9);
  padding: 3rem 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* Interactive Big-O Complexity Section */
.complexity-section {
  padding: 5rem 0;
  position: relative;
}

.complexity-playground {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  margin-top: 2rem;
}

.playground-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.mode-toggle-group {
  display: inline-flex;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 10px;
  padding: 4px;
  gap: 4px;
}

.mode-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 7px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.mode-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.complexity-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-btn {
  background: #0d1117;
  border: 1px solid #30363d;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.chip-btn:hover {
  border-color: rgba(16, 185, 129, 0.4);
  color: var(--text-primary);
}

.chip-btn.active {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--primary);
  color: #34d399;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: #0d1117;
  border: 1px solid #30363d;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  flex: 1;
  min-width: 260px;
}

.slider-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.slider-input {
  flex: 1;
  accent-color: var(--primary);
  cursor: pointer;
}

.slider-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #34d399;
  font-weight: 700;
  min-width: 60px;
  text-align: right;
}

/* Visualization Grid */
.vis-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.5rem;
}

.chart-card {
  background: #090d16;
  border: 1px solid #21262d;
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.chart-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
}

.chart-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.badge-excellent { background: rgba(16, 185, 129, 0.2); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.badge-good { background: rgba(6, 182, 212, 0.2); color: #22d3ee; border: 1px solid rgba(6, 182, 212, 0.4); }
.badge-fair { background: rgba(234, 179, 8, 0.2); color: #facc15; border: 1px solid rgba(234, 179, 8, 0.4); }
.badge-bad { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }

.canvas-wrapper {
  position: relative;
  width: 100%;
  height: 280px;
}

canvas#complexityCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.info-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.metrics-box {
  background: #090d16;
  border: 1px solid #21262d;
  border-radius: 12px;
  padding: 1.25rem;
}

.metric-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.85rem;
}

.metric-item:last-child {
  border-bottom: none;
}

.metric-name {
  color: var(--text-secondary);
}

.metric-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #f0f6fc;
}

.preset-selector {
  background: #090d16;
  border: 1px solid #21262d;
  border-radius: 12px;
  padding: 1.25rem;
}

.preset-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.presets-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.preset-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #0d1117;
  border: 1px solid #30363d;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.preset-btn:hover, .preset-btn.active {
  border-color: var(--primary);
  background: rgba(16, 185, 129, 0.1);
  color: #ffffff;
}

.preset-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #34d399;
}

@media (max-width: 900px) {
  .vis-grid { grid-template-columns: 1fr; }
}

/* Mobile Hamburger Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 101;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .footer-content { flex-direction: column; text-align: center; }

  .mobile-menu-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(7, 9, 14, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
    gap: 0.5rem;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.5);
  }

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

  .nav-links .nav-link {
    padding: 10px 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--border-subtle);
  }

  .nav-links .btn-cta {
    margin-top: 8px;
    justify-content: center;
    width: 100%;
    text-align: center;
  }
}