/* ========================================
   Password Generator - Dark & Light Themes
   ======================================== */

:root {
  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Accent Colors (shared) */
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);

  /* Strength Colors (shared) */
  --strength-weak: #ef4444;
  --strength-fair: #f97316;
  --strength-good: #eab308;
  --strength-strong: #22c55e;
  --strength-excellent: #06b6d4;
}

/* Dark Theme (default) */
[data-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(25, 25, 35, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);

  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);

  --bg-gradient-1: rgba(99, 102, 241, 0.08);
  --bg-gradient-2: rgba(139, 92, 246, 0.08);
  --bg-gradient-3: rgba(168, 85, 247, 0.05);

  --checkbox-hover-bg: rgba(99, 102, 241, 0.05);
  --checkbox-checked-bg: rgba(99, 102, 241, 0.1);
  --copy-hover-bg: rgba(99, 102, 241, 0.1);
  --copy-success-bg: rgba(34, 197, 94, 0.15);
}

/* Light Theme */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-glass: rgba(0, 0, 0, 0.02);

  --text-primary: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(99, 102, 241, 0.4);

  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.1);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);

  --bg-gradient-1: rgba(99, 102, 241, 0.05);
  --bg-gradient-2: rgba(139, 92, 246, 0.05);
  --bg-gradient-3: rgba(168, 85, 247, 0.03);

  --checkbox-hover-bg: rgba(99, 102, 241, 0.08);
  --checkbox-checked-bg: rgba(99, 102, 241, 0.12);
  --copy-hover-bg: rgba(99, 102, 241, 0.1);
  --copy-success-bg: rgba(34, 197, 94, 0.12);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  overflow-x: hidden;
}

/* Background Effects */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 20%, var(--bg-gradient-1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, var(--bg-gradient-2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, var(--bg-gradient-3) 0%, transparent 60%);
  animation: bgFloat 20s ease-in-out infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes bgFloat {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(2%, 2%) rotate(1deg);
  }

  66% {
    transform: translate(-1%, 1%) rotate(-0.5deg);
  }
}

/* Main Container */
.container {
  width: 100%;
  max-width: 540px;
}

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 40px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg,
      transparent 0%,
      rgba(255, 255, 255, 0.1) 50%,
      transparent 100%);
}

/* Header */
.header {
  text-align: center;
  margin-bottom: 36px;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Password Display */
.password-display {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 28px;
  position: relative;
  transition: all 0.3s ease;
}

.password-display:hover {
  border-color: var(--border-glow);
}

.password-wrapper {
  display: flex;
  align-items: center;
  gap: 16px;
}

.password-text {
  flex: 1;
  font-family: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;
  font-size: 1.1rem;
  color: var(--text-primary);
  word-break: break-all;
  line-height: 1.5;
  min-height: 28px;
}

.password-text.placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.copy-btn {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.copy-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: scale(1.05);
}

.copy-btn:active {
  transform: scale(0.95);
}

.copy-btn.copied {
  background: rgba(34, 197, 94, 0.15);
  border-color: var(--strength-strong);
  color: var(--strength-strong);
}

.copy-btn svg {
  width: 20px;
  height: 20px;
}

/* Strength Indicator */
.strength-container {
  margin-bottom: 28px;
}

.strength-bar {
  height: 4px;
  background: var(--bg-glass);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 8px;
}

.strength-fill {
  height: 100%;
  width: 0%;
  border-radius: 2px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.strength-fill.weak {
  background: var(--strength-weak);
  width: 20%;
}

.strength-fill.fair {
  background: var(--strength-fair);
  width: 40%;
}

.strength-fill.good {
  background: var(--strength-good);
  width: 60%;
}

.strength-fill.strong {
  background: var(--strength-strong);
  width: 80%;
}

.strength-fill.excellent {
  background: var(--strength-excellent);
  width: 100%;
}

.strength-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
}

.strength-label span:first-child {
  color: var(--text-muted);
}

.strength-label .strength-value {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.strength-value.weak {
  color: var(--strength-weak);
}

.strength-value.fair {
  color: var(--strength-fair);
}

.strength-value.good {
  color: var(--strength-good);
}

.strength-value.strong {
  color: var(--strength-strong);
}

.strength-value.excellent {
  color: var(--strength-excellent);
}

/* Mode Toggle */
.mode-toggle {
  display: flex;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 24px;
}

.mode-btn {
  flex: 1;
  padding: 12px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.mode-btn:hover {
  color: var(--text-primary);
}

.mode-btn.active {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Options Section */
.options-section {
  margin-bottom: 24px;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

/* Slider */
.slider-container {
  margin-bottom: 24px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.slider-header label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.slider-value {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  font-size: 1.1rem;
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg-glass);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent-gradient);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
  transition: transform 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--accent-gradient);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* Checkboxes */
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.checkbox-item:hover {
  border-color: var(--border-glow);
  background: rgba(99, 102, 241, 0.05);
}

.checkbox-item.checked {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

.checkbox-item input {
  display: none;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  flex-shrink: 0;
}

.checkbox-item.checked .checkbox-custom {
  background: var(--accent-gradient);
  border-color: transparent;
}

.checkbox-custom svg {
  width: 12px;
  height: 12px;
  stroke: white;
  stroke-width: 3;
  opacity: 0;
  transform: scale(0.5);
  transition: all 0.2s ease;
}

.checkbox-item.checked .checkbox-custom svg {
  opacity: 1;
  transform: scale(1);
}

.checkbox-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.checkbox-item.checked .checkbox-label {
  color: var(--text-primary);
}

/* Generate Button */
.generate-btn {
  width: 100%;
  padding: 18px 24px;
  background: var(--accent-gradient);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.generate-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg,
      transparent,
      rgba(255, 255, 255, 0.2),
      transparent);
  transition: left 0.5s ease;
}

.generate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.generate-btn:hover::before {
  left: 100%;
}

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

/* Word Mode Specific */
.word-options {
  display: none;
}

.word-options.visible {
  display: block;
}

.cryptic-options {
  display: block;
}

.cryptic-options.hidden {
  display: none;
}

.separator-select {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;
}

.separator-select:hover {
  border-color: var(--border-glow);
}

.separator-select:focus {
  outline: none;
  border-color: var(--accent-primary);
}

.separator-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

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

.footer .security-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  padding: 6px 12px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--strength-strong);
}

.footer .security-badge svg {
  width: 14px;
  height: 14px;
}

/* Responsive - Tablet */
@media (max-width: 600px) {
  body {
    padding: 16px;
    align-items: flex-start;
    padding-top: 24px;
  }

  .card {
    padding: 28px 20px;
    border-radius: var(--radius-lg);
  }

  .header {
    margin-bottom: 28px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .header p {
    font-size: 0.85rem;
  }

  .password-display {
    padding: 16px 18px;
    margin-bottom: 20px;
  }

  .password-text {
    font-size: 0.95rem;
    line-height: 1.6;
  }

  .strength-container {
    margin-bottom: 20px;
  }

  .mode-toggle {
    margin-bottom: 20px;
  }

  .mode-btn {
    padding: 14px 12px;
    font-size: 0.85rem;
  }

  .options-section {
    margin-bottom: 20px;
  }

  .slider-container {
    margin-bottom: 20px;
  }

  .checkbox-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .checkbox-item {
    padding: 16px 14px;
  }

  .generate-btn {
    padding: 16px 20px;
    font-size: 0.95rem;
  }

  .footer {
    margin-top: 20px;
    padding-top: 20px;
  }

  .theme-toggle {
    width: 40px;
    height: 40px;
    top: 16px;
    right: 16px;
  }

  .theme-toggle svg {
    width: 18px;
    height: 18px;
  }
}

/* Responsive - Mobile Small */
@media (max-width: 400px) {
  body {
    padding: 12px;
    padding-top: 16px;
  }

  .card {
    padding: 24px 16px;
  }

  .header h1 {
    font-size: 1.35rem;
  }

  .password-display {
    padding: 14px 16px;
  }

  .password-text {
    font-size: 0.85rem;
  }

  .copy-btn {
    padding: 10px;
  }

  .copy-btn svg {
    width: 18px;
    height: 18px;
  }

  .mode-btn {
    padding: 12px 10px;
    font-size: 0.8rem;
  }

  .section-title {
    font-size: 0.7rem;
  }

  .slider-header label {
    font-size: 0.85rem;
  }

  .slider-value {
    font-size: 1rem;
  }

  .checkbox-item {
    padding: 14px 12px;
  }

  .checkbox-label {
    font-size: 0.85rem;
  }

  .generate-btn {
    padding: 14px 16px;
    font-size: 0.9rem;
  }

  .separator-select {
    padding: 12px 14px;
    font-size: 0.85rem;
  }

  .footer p {
    font-size: 0.75rem;
  }

  .footer .security-badge {
    font-size: 0.7rem;
    padding: 5px 10px;
  }

  .theme-toggle {
    width: 36px;
    height: 36px;
    top: 14px;
    right: 14px;
  }

  .theme-toggle svg {
    width: 16px;
    height: 16px;
  }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
  .checkbox-item {
    min-height: 52px;
  }

  .mode-btn {
    min-height: 48px;
  }

  .generate-btn {
    min-height: 54px;
  }

  .copy-btn {
    min-width: 48px;
    min-height: 48px;
  }

  .theme-toggle {
    min-width: 44px;
    min-height: 44px;
  }

  .slider {
    height: 8px;
  }

  .slider::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }

  .slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }
}

/* Safe area for notched devices */
@supports (padding: max(0px)) {
  body {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    padding-bottom: max(24px, env(safe-area-inset-bottom));
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

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

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

/* Toast Notification */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--strength-strong);
  border-radius: var(--radius-md);
  padding: 12px 24px;
  color: var(--strength-strong);
  font-size: 0.9rem;
  font-weight: 500;
  backdrop-filter: blur(20px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
  z-index: 1000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Theme Toggle */
.theme-toggle {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  color: var(--text-secondary);
}

.theme-toggle:hover {
  border-color: var(--border-glow);
  color: var(--accent-primary);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg);
}

[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg);
}

/* Theme Transition */
body,
.card,
.password-display,
.copy-btn,
.checkbox-item,
.slider,
.separator-select,
.toast {
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}