[data-theme="dark"] ::selection {
  background: var(--selection);
  color: inherit;
}

textarea::selection,
input::selection {
  background: var(--selection);
  color: inherit;
}
/* ============================================
   DevTools Suite - Main Styles
   Modern, Fast, Beautiful
   ============================================ */

:root {
  /* Light Mode Colors */
  --bg-primary: rgba(255, 255, 255, 0.82);
  --bg-secondary: #eef1f8;
  --bg-tertiary: rgba(255, 255, 255, 0.9);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --border-color: rgba(148, 163, 184, 0.28);
  --shadow-sm: 0 6px 20px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 10px 28px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.14);
  --shadow-xl: 0 22px 60px rgba(15, 23, 42, 0.18);
  
  /* Brand Colors - Vibrant! */
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --secondary: #10b981;
  --accent: #f59e0b;
  --danger: #ef4444;
  --purple: #8b5cf6;
  --pink: #ec4899;
  --cyan: #06b6d4;
  --orange: #f97316;
  
  /* Tool Category Colors */
  --tag-text: #4f46e5;
  --tag-encoding: #10b981;
  --tag-formatter: #f59e0b;
  --tag-security: #ef4444;
  --tag-converter: #8b5cf6;

  /* Glass Surfaces */
  --glass-1: rgba(255, 255, 255, 0.78);
  --glass-2: rgba(255, 255, 255, 0.6);
  --glass-strong: rgba(255, 255, 255, 0.85);
  --selection: #fef08a;
}

[data-theme="dark"] {
  --bg-primary: rgba(22, 27, 36, 0.85);
  --bg-secondary: #0a0f1c;
  --bg-tertiary: rgba(26, 32, 44, 0.88);
  --text-primary: #e5e7eb;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;
  --border-color: rgba(148, 163, 184, 0.2);
  --shadow-sm: 0 6px 20px rgba(0, 0, 0, 0.45);
  --shadow-md: 0 10px 28px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.65);
  --shadow-xl: 0 22px 60px rgba(0, 0, 0, 0.75);

  --glass-1: rgba(26, 32, 44, 0.78);
  --glass-2: rgba(15, 23, 42, 0.6);
  --glass-strong: rgba(30, 41, 59, 0.85);
  --selection: rgba(255, 214, 102, 0.28);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Helvetica Neue', sans-serif;
  background:
    radial-gradient(circle at 10% 20%, rgba(99,102,241,0.08) 0, transparent 25%),
    radial-gradient(circle at 90% 10%, rgba(16,185,129,0.08) 0, transparent 20%),
    radial-gradient(circle at 20% 80%, rgba(236,72,153,0.08) 0, transparent 22%),
    linear-gradient(120deg, rgba(255,255,255,0.35), rgba(255,255,255,0.15)),
    var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

[data-theme="dark"] body {
  background:
    radial-gradient(circle at 10% 20%, rgba(99,102,241,0.14) 0, transparent 28%),
    radial-gradient(circle at 90% 10%, rgba(16,185,129,0.14) 0, transparent 24%),
    radial-gradient(circle at 20% 80%, rgba(236,72,153,0.14) 0, transparent 26%),
    linear-gradient(120deg, rgba(15,23,42,0.6), rgba(15,23,42,0.4)),
    var(--bg-secondary);
}

[data-theme="dark"] body {
  background:
    radial-gradient(circle at 10% 20%, rgba(99,102,241,0.14) 0, transparent 28%),
    radial-gradient(circle at 90% 10%, rgba(16,185,129,0.14) 0, transparent 24%),
    radial-gradient(circle at 20% 80%, rgba(236,72,153,0.14) 0, transparent 26%),
    linear-gradient(120deg, rgba(15,23,42,0.6), rgba(15,23,42,0.4)),
    var(--bg-secondary);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
  background: linear-gradient(120deg, var(--glass-strong), var(--glass-2));
  padding: 0.7rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--glass-1), var(--glass-2));
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.brand-icon {
  font-size: 1.5rem;
}

.theme-toggle {
  background: linear-gradient(135deg, var(--glass-1), var(--glass-2));
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1.05rem;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.theme-toggle:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* ============================================
   Hero Section
   ============================================ */

.home-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 3rem 2rem;
  flex: 1;
}

.hero {
  text-align: center;
  margin-bottom: 3rem;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.16), rgba(236, 72, 153, 0.14), rgba(16, 185, 129, 0.12)), linear-gradient(135deg, var(--glass-strong), var(--glass-1));
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.4rem 2.1rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(120deg, #6366f1, #8b5cf6, #ec4899, #f59e0b, #10b981);
  background-size: 180% 180%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 6s ease infinite;
}

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

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-cta {
  display: inline-block;
  padding: 0.9rem 1.8rem;
  background: linear-gradient(135deg, var(--primary), var(--purple));
  color: white;
  text-decoration: none;
  border-radius: 14px;
  font-weight: 700;
  font-size: 1.05rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 14px 28px rgba(99, 102, 241, 0.25);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.3);
}

.hero-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s;
}

.hero-cta:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.hero-cta:hover::before {
  left: 100%;
}

.hero-cta:active {
  transform: translateY(-1px) scale(1.02);
}

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

.feature-badge {
  background: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  border: 2px solid;
  transition: all 0.3s ease;
}

.badge-secure {
  border-color: var(--secondary);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
}

.badge-fast {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
}

.badge-beautiful {
  border-color: var(--purple);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(139, 92, 246, 0.05));
}

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

/* ============================================
   Search
   ============================================ */

.search-container {
  max-width: 720px;
  margin: 0 auto 3rem;
}

.search-input {
  width: 100%;
  padding: 1rem 1.5rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  background: linear-gradient(135deg, var(--glass-strong), var(--glass-1));
  color: var(--text-primary);
  transition: all 0.2s ease;
  outline: none;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

[data-theme="dark"] .search-input {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.78), rgba(15, 23, 42, 0.7));
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ============================================
   Tools Grid
   ============================================ */

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.4rem;
  margin-bottom: 3rem;
}

.tool-card {
  background: linear-gradient(160deg, var(--glass-strong), var(--glass-2));
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 1.6rem;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

[data-theme="dark"] .tool-card {
  background: linear-gradient(160deg, rgba(30, 41, 59, 0.82), rgba(15, 23, 42, 0.72));
  border-color: rgba(148, 163, 184, 0.24);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #6366f1, #8b5cf6, #ec4899, #f59e0b, #10b981);
  background-size: 200% auto;
  transform: scaleX(0);
  transition: transform 0.3s ease;
  animation: gradientShift 3s linear infinite;
}

.tool-card:nth-child(odd)::before {
  background: linear-gradient(90deg, #10b981, #06b6d4, #6366f1);
}

.tool-card:nth-child(even)::before {
  background: linear-gradient(90deg, #f59e0b, #ec4899, #8b5cf6);
}

.tool-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(99, 102, 241, 0.35);
}

.tool-card:hover::before {
  transform: scaleX(1);
}

.tool-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  transition: transform 0.3s ease;
  display: inline-block;
}

.tool-card:hover .tool-icon {
  transform: scale(1.2) rotate(5deg);
}

.tool-name {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.tool-desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.tool-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag {
  padding: 0.25rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* ============================================
   Tool Container
   ============================================ */

.tool-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
  flex: 1;
}

.tool-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.back-btn {
  background: linear-gradient(135deg, rgba(255,255,255,0.8), rgba(255,255,255,0.6));
  border: 1px solid var(--border-color);
  padding: 0.85rem 1.6rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.back-btn:hover {
  background: linear-gradient(135deg, rgba(255,255,255,0.92), rgba(255,255,255,0.75));
  transform: translateX(-2px) translateY(-1px);
  box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .back-btn {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.82), rgba(15, 23, 42, 0.72));
  border-color: rgba(148, 163, 184, 0.24);
  color: var(--text-primary);
}

[data-theme="dark"] .back-btn:hover {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.92), rgba(15, 23, 42, 0.82));
  box-shadow: var(--shadow-md);
}

.tool-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
}

.tool-content {
  background: linear-gradient(160deg, var(--glass-strong), var(--glass-2));
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 2.2rem;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}

[data-theme="dark"] .tool-content {
  background: linear-gradient(160deg, rgba(30, 41, 59, 0.82), rgba(15, 23, 42, 0.7));
  border-color: rgba(148, 163, 184, 0.24);
}

/* ============================================
   Utilities
   ============================================ */

.hidden {
  display: none !important;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-top: auto;
}

.footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-container {
    padding: 0 1rem;
  }
  
  .home-section,
  .tool-container {
    padding: 2rem 1rem;
  }
  
  .tool-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-card {
  animation: fadeIn 0.5s ease backwards;
}

.tool-card:nth-child(1) { animation-delay: 0.05s; }
.tool-card:nth-child(2) { animation-delay: 0.1s; }
.tool-card:nth-child(3) { animation-delay: 0.15s; }
.tool-card:nth-child(4) { animation-delay: 0.2s; }
.tool-card:nth-child(5) { animation-delay: 0.25s; }
.tool-card:nth-child(6) { animation-delay: 0.3s; }
.tool-card:nth-child(7) { animation-delay: 0.35s; }
.tool-card:nth-child(8) { animation-delay: 0.4s; }
.tool-card:nth-child(9) { animation-delay: 0.45s; }
.tool-card:nth-child(10) { animation-delay: 0.5s; }
.tool-card:nth-child(11) { animation-delay: 0.55s; }
.tool-card:nth-child(12) { animation-delay: 0.6s; }