/* CSS Variables for Theme Support */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border: #374151;
  --shadow: rgba(0, 0, 0, 0.3);
  --glass: rgba(15, 23, 42, 0.8);
}

/* Light Theme Variables */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: rgba(0, 0, 0, 0.1);
  --glass: rgba(248, 250, 252, 0.9);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow-x: hidden;
  transition: all 0.3s ease;
}

/* Floating Particles Animation */
.floating-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  animation: float 15s infinite linear;
}

@keyframes float {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-100px) rotate(360deg);
    opacity: 0;
  }
}

/* Main Container */
.container {
  background: var(--glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2rem;
  width: min(600px, 95vw);
  box-shadow: 0 20px 40px var(--shadow);
  position: relative;
  animation: slideUp 0.8s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Header Section */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

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

.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px var(--shadow);
}

/* Password Output Section */
.password-output {
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
  transition: all 0.3s ease;
}

.password-field {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-family: "Courier New", monospace;
  text-align: center;
  outline: none;
  padding: 0.5rem 0;
  word-break: break-all;
}

.password-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* Button Styles */
.btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  border: none;
  border-radius: 12px;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  box-shadow: 0 4px 12px var(--shadow);
}

/* Dice Animation */
.dice {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.dice.rolling {
  animation: roll 0.6s ease-in-out;
}

@keyframes roll {
  0%,
  100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(90deg);
  }
  50% {
    transform: rotate(180deg);
  }
  75% {
    transform: rotate(270deg);
  }
}

/* Settings Section */
.settings-grid {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.setting-group {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.setting-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Length Control */
.length-control {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.length-slider {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
}

.length-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.length-display {
  background: var(--primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 600;
  min-width: 60px;
  text-align: center;
}

/* Checkbox Styles */
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-tertiary);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.checkbox-item:hover {
  background: var(--border);
}

.checkbox {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 4px;
  position: relative;
  transition: all 0.3s ease;
}

.checkbox.checked {
  background: var(--primary);
  border-color: var(--primary);
}

.checkbox.checked::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

/* Strength Meter */
.strength-meter {
  margin-bottom: 1.5rem;
}

.strength-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.strength-label {
  font-weight: 600;
  color: var(--text-secondary);
}

.entropy-info {
  display: flex;
  gap: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.strength-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.strength-fill {
  height: 100%;
  transition: all 0.5s ease;
  border-radius: 4px;
}

/* Strength Level Colors */
.strength-very-weak {
  background: var(--danger);
}
.strength-weak {
  background: #f97316;
}
.strength-medium {
  background: var(--warning);
}
.strength-strong {
  background: #22c55e;
}
.strength-very-strong {
  background: var(--success);
}

/* Toast Notifications */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--success);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 1000;
}

.toast.show {
  transform: translateX(0);
}

/* Emoji Selector */
.emoji-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.emoji-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1.2rem;
}

.emoji-btn:hover {
  background: var(--primary);
  transform: scale(1.1);
}

/* Responsive Design */
@media (max-width: 640px) {
  .container {
    padding: 1.5rem;
  }

  .title {
    font-size: 1.5rem;
  }

  .checkbox-grid {
    grid-template-columns: 1fr;
  }

  .password-actions {
    flex-direction: column;
  }

  .entropy-info {
    flex-direction: column;
    gap: 0.25rem;
  }
}