/* CRCrypt Web - Clean, Minimal Design */
:root {
  --scale: 1;
  --radius: 8px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
  
  /* Light theme */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --border-color: #dee2e6;
  --accent-color: #0066cc;
  --accent-hover: #0052a3;
  --success-color: #28a745;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
  --focus-ring: 0 0 0 2px rgba(0, 102, 204, 0.25);
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #404040;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --border-color: #404040;
    --accent-color: #4d94ff;
    --accent-hover: #3380ff;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --focus-ring: 0 0 0 2px rgba(77, 148, 255, 0.25);
  }
}

html[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --border-color: #dee2e6;
  --accent-color: #0066cc;
  --accent-hover: #0052a3;
}

html[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #404040;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #808080;
  --border-color: #404040;
  --accent-color: #4d94ff;
  --accent-hover: #3380ff;
}

/* Base styles */
html {
  font-family: var(--font-family);
  font-size: calc(16px * var(--scale));
  line-height: 1.5;
  background: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html[data-font="small"] { --scale: 0.875; }
html[data-font="medium"] { --scale: 1; }
html[data-font="large"] { --scale: 1.125; }

*, *::before, *::after { 
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
}

/* Header */
.app-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-5) var(--space-4);
}

.header-content {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: inherit;
}

.logo {
  width: 32px;
  height: 32px;
  background: var(--accent-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.logo svg {
  width: 20px;
  height: 20px;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--space-2);
  max-width: 600px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Main content */
.app-main {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  min-height: calc(100vh - 200px);
}

/* Mode switcher */
.mode-switch {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-6);
}

[role="tablist"] {
  display: inline-flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-1);
}

.tab {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  padding: var(--space-3) var(--space-5);
  border-radius: calc(var(--radius) - 2px);
  cursor: pointer;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.tab:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.tab[aria-selected="true"] {
  background: var(--accent-color);
  color: white;
}

.tab:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Panels */
[role="tabpanel"] {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

/* Forms */
form {
  display: grid;
  gap: var(--space-5);
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  display: grid;
  gap: var(--space-2);
}

label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* Input styles */
textarea, input[type="text"], input[type="password"], input[type="number"], select {
  width: 100%;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: var(--space-3);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: var(--focus-ring);
}

textarea {
  resize: vertical;
  min-height: 100px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

textarea[readonly], select:disabled, input:disabled {
  background: var(--bg-secondary);
  color: var(--text-muted);
  cursor: not-allowed;
  opacity: 0.7;
}

/* Select styling */
select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236c757d' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.75rem center;
  background-repeat: no-repeat;
  background-size: 1rem 1rem;
  padding-right: 2.5rem;
}

select:focus {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%230066cc' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
}

/* Password section */
.passwords {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

/* Strength meter */
.strength {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.strength-bar {
  height: 4px;
  width: 120px;
  background: var(--border-color);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}

.strength-bar::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0%;
  background: linear-gradient(90deg, var(--danger-color), var(--warning-color), var(--success-color));
  transition: width 0.3s ease;
}

.strength-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Advanced settings */
.advanced {
  max-width: 600px;
  margin: 0 auto;
}

.advanced summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent-color);
  padding: var(--space-3);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: background-color 0.2s ease;
}

.advanced summary:hover {
  background: var(--bg-tertiary);
}

.advanced summary::-webkit-details-marker {
  display: none;
}

.advanced summary::before {
  content: '⚙️ ';
}

.advanced .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding: var(--space-5);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

/* Help text */
.help {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: var(--space-1);
  line-height: 1.4;
}

/* Buttons */
.actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-5);
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-width: 120px;
}

.btn-primary {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

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

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
}

.btn-danger {
  background: var(--danger-color);
  color: white;
  border-color: var(--danger-color);
}

.btn-danger:hover {
  background: #c82333;
  border-color: #c82333;
}

.btn:focus-visible {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Output sections */
.output-group {
  max-width: 600px;
  margin: var(--space-5) auto 0;
  display: grid;
  gap: var(--space-3);
}

.output-group textarea {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
}

/* Footer */
.app-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--space-5) var(--space-4);
  margin-top: auto;
}

.footer-content {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.notice {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin: 0;
}

.footer-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Icon buttons */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.icon-btn:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

.icon-btn.small {
  width: 32px;
  height: 32px;
}

/* Settings modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: var(--space-4);
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  width: min(500px, 90vw);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.modal-body {
  padding: var(--space-5);
  display: grid;
  gap: var(--space-5);
}

.modal fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.modal legend {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  font-size: 1rem;
}

.modal label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.modal label:hover {
  background: var(--bg-secondary);
}

.modal input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-color);
}

/* Validation states */
input[aria-invalid="true"],
textarea[aria-invalid="true"],
select[aria-invalid="true"] {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.25);
}

.help.error {
  color: var(--danger-color);
  font-weight: 500;
}

/* Strength bar classes */
.strength-bar.s-0::after { width: 0%; }
.strength-bar.s-25::after { width: 25%; }
.strength-bar.s-50::after { width: 50%; }
.strength-bar.s-75::after { width: 75%; }
.strength-bar.s-100::after { width: 100%; }

/* Responsive design */
@media (max-width: 768px) {
  .app-main {
    padding: var(--space-4);
  }
  
  .header-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
  
  [role="tabpanel"] {
    padding: var(--space-4);
  }
  
  .advanced .grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  
  .actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--space-3);
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }
  
  .app-main {
    padding: var(--space-3);
  }
  
  [role="tabpanel"] {
    padding: var(--space-3);
  }
  
  .passwords {
    padding: var(--space-4);
  }
  
  .advanced .grid {
    padding: var(--space-4);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Hidden elements */
[hidden] {
  display: none !important;
}