/**
 * WCAG-Compliant Design System
 * Shared styles for the entire application
 */

/* WCAG-minded theme tokens (Light + Dark)
   Notes:
   - Use --border-2 for inputs/buttons (meets 3:1 boundary contrast).
   - --border-1 is decorative (may be <3:1 by design).
*/
:root {
  /* Surfaces */
  --bg: #F8FAFC;            /* app background */
  --surface-1: #FFFFFF;     /* cards, panels */
  --surface-2: #F1F5F9;     /* subtle fill (tables, chips) */
  --surface-3: #E2E8F0;     /* hover fill on subtle surfaces */
  --overlay: rgba(15,23,42,.55); /* modal scrim */

  /* Text */
  --text-1: #0F172A;        /* primary text */
  --text-2: #334155;        /* secondary text */
  --text-3: #475569;        /* muted/help text (still AA on --bg) */
  --text-placeholder: #6B7280;
  --text-inverse: #F8FAFC;

  /* Links */
  --link: #1D4ED8;
  --link-hover: #1E40AF;
  --link-visited: #5B21B6;

  /* Borders (important for WCAG 1.4.11) */
  --border-1: #E2E8F0;      /* decorative separators */
  --border-2: #6B7280;      /* controls (inputs/buttons) – 3:1+ */
  --border-3: #334155;      /* strong borders */

  /* Focus */
  --focus: #2563EB;         /* focus ring color */
  --focus-outer: rgba(37,99,235,.35);

  /* Brand / Actions */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-active: #1E40AF;
  --on-primary: #FFFFFF;

  --secondary-bg: #F1F5F9;
  --secondary-hover: #E2E8F0;
  --secondary-active: #CBD5E1;
  --on-secondary: #0F172A;

  /* Status */
  --success: #15803D;
  --success-hover: #166534;
  --success-active: #14532D;
  --on-success: #FFFFFF;

  --warning: #B45309;
  --warning-hover: #92400E;
  --warning-active: #78350F;
  --on-warning: #FFFFFF;

  --danger: #B91C1C;
  --danger-hover: #991B1B;
  --danger-active: #7F1D1D;
  --on-danger: #FFFFFF;

  --info: #0369A1;
  --info-hover: #075985;
  --info-active: #0C4A6E;
  --on-info: #FFFFFF;

  /* Interaction overlays (for ghost buttons, row hover, etc.) */
  --hover-overlay: rgba(15,23,42,.04);
  --active-overlay: rgba(15,23,42,.07);

  /* Modal and overlay backgrounds */
  --overlay-dark: rgba(0,0,0,0.7);
  --overlay-medium: rgba(0,0,0,0.5);
  --overlay-light: rgba(0,0,0,0.3);
  --overlay-white-light: rgba(255,255,255,0.1);
  --overlay-white-medium: rgba(255,255,255,0.2);
  --overlay-white-heavy: rgba(255,255,255,0.3);

  /* Selection */
  --selection-bg: rgba(37,99,235,.20);

  /* Shadows (use with elevated surfaces) */
  --shadow-1: 0 1px 2px rgba(15,23,42,.10);
  --shadow-2: 0 6px 20px rgba(15,23,42,.14);
  --shadow-3: 0 14px 40px rgba(15,23,42,.18);

  /* Optional: semantic "hairline" highlight for crisp edges */
  --edge-highlight: rgba(255,255,255,.65);

  /* Legacy aliases for backward compatibility */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F1F5F9;
  --bg-tertiary: #E2E8F0;
  --panel: #FFFFFF;
  --border: #E2E8F0;
  --border-color: #6B7280;
  --text: #0F172A;
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-light: #FFFFFF;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: rgba(37,99,235,.20);
  --error: #B91C1C;
  --shadow: rgba(15,23,42,.10);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 40px;

  /* Shadows (legacy) */
  --shadow-sm: 0 1px 2px rgba(15,23,42,.10);
  --shadow-md: 0 6px 20px rgba(15,23,42,.14);
  --shadow-lg: 0 10px 15px rgba(15,23,42,.14);
  --shadow-xl: 0 14px 40px rgba(15,23,42,.18);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* Explicit light mode (ensures light theme works when data-theme="light" is set) */
[data-theme="light"] {
  /* Surfaces */
  --bg: #F8FAFC;            /* app background */
  --surface-1: #FFFFFF;     /* cards, panels */
  --surface-2: #F1F5F9;     /* subtle fill (tables, chips) */
  --surface-3: #E2E8F0;     /* hover fill on subtle surfaces */
  --overlay: rgba(15,23,42,.55); /* modal scrim */

  /* Text */
  --text-1: #0F172A;        /* primary text */
  --text-2: #334155;        /* secondary text */
  --text-3: #475569;        /* muted/help text (still AA on --bg) */
  --text-placeholder: #6B7280;
  --text-inverse: #F8FAFC;

  /* Links */
  --link: #1D4ED8;
  --link-hover: #1E40AF;
  --link-visited: #5B21B6;

  /* Borders (important for WCAG 1.4.11) */
  --border-1: #E2E8F0;      /* decorative separators */
  --border-2: #6B7280;      /* controls (inputs/buttons) – 3:1+ */
  --border-3: #334155;      /* strong borders */

  /* Focus */
  --focus: #2563EB;         /* focus ring color */
  --focus-outer: rgba(37,99,235,.35);

  /* Brand / Actions */
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-active: #1E40AF;
  --on-primary: #FFFFFF;

  --secondary-bg: #F1F5F9;
  --secondary-hover: #E2E8F0;
  --secondary-active: #CBD5E1;
  --on-secondary: #0F172A;

  /* Status */
  --success: #15803D;
  --success-hover: #166534;
  --success-active: #14532D;
  --on-success: #FFFFFF;

  --warning: #B45309;
  --warning-hover: #92400E;
  --warning-active: #78350F;
  --on-warning: #FFFFFF;

  --danger: #B91C1C;
  --danger-hover: #991B1B;
  --danger-active: #7F1D1D;
  --on-danger: #FFFFFF;

  --info: #0369A1;
  --info-hover: #075985;
  --info-active: #0C4A6E;
  --on-info: #FFFFFF;

  /* Interaction overlays */
  --hover-overlay: rgba(15,23,42,.04);
  --active-overlay: rgba(15,23,42,.07);

  /* Selection */
  --selection-bg: rgba(37,99,235,.20);

  /* Shadows */
  --shadow-1: 0 1px 2px rgba(15,23,42,.10);
  --shadow-2: 0 6px 20px rgba(15,23,42,.14);
  --shadow-3: 0 14px 40px rgba(15,23,42,.18);
  --edge-highlight: rgba(255,255,255,.65);

  /* Legacy aliases for backward compatibility */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F1F5F9;
  --bg-tertiary: #E2E8F0;
  --panel: #FFFFFF;
  --border: #E2E8F0;
  --border-color: #6B7280;
  --text: #0F172A;
  --text-primary: #0F172A;
  --text-secondary: #334155;
  --text-muted: #475569;
  --text-light: #FFFFFF;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: rgba(37,99,235,.20);
  --error: #B91C1C;
  --shadow: rgba(15,23,42,.10);

  /* Shadows (legacy) */
  --shadow-sm: 0 1px 2px rgba(15,23,42,.10);
  --shadow-md: 0 6px 20px rgba(15,23,42,.14);
  --shadow-lg: 0 10px 15px rgba(15,23,42,.14);
  --shadow-xl: 0 14px 40px rgba(15,23,42,.18);
}

/* Dark mode */
[data-theme="dark"] {
  --bg: #0B1220;
  --surface-1: #111B2E;
  --surface-2: #162443;
  --surface-3: #1B2B4A;
  --overlay: rgba(2,6,23,.72);

  --text-1: #F8FAFC;
  --text-2: #CBD5E1;
  --text-3: #94A3B8;
  --text-placeholder: #94A3B8;
  --text-inverse: #0B1220;

  --link: #60A5FA;
  --link-hover: #93C5FD;
  --link-visited: #C4B5FD;

  --border-1: #24324A;      /* decorative */
  --border-2: #64748B;      /* controls (3:1+ vs dark surfaces) */
  --border-3: #94A3B8;

  --focus: #93C5FD;
  --focus-outer: rgba(147,197,253,.35);

  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-active: #1E40AF;
  --on-primary: #FFFFFF;

  --secondary-bg: #111B2E;
  --secondary-hover: #162443;
  --secondary-active: #1B2B4A;
  --on-secondary: #F8FAFC;

  --success: #16A34A;        /* slightly brighter for dark UI */
  --success-hover: #15803D;
  --success-active: #166534;
  --on-success: #0B1220;     /* readable on bright green */

  --warning: #F59E0B;        /* brighter amber for dark UI */
  --warning-hover: #D97706;
  --warning-active: #B45309;
  --on-warning: #0B1220;     /* readable on bright amber */

  --danger: #EF4444;         /* brighter red for dark UI */
  --danger-hover: #DC2626;
  --danger-active: #B91C1C;
  --on-danger: #0B1220;      /* readable on bright red */

  --info: #38BDF8;
  --info-hover: #0EA5E9;
  --info-active: #0284C7;
  --on-info: #0B1220;

  --hover-overlay: rgba(248,250,252,.06);
  --active-overlay: rgba(248,250,252,.10);

  /* Modal and overlay backgrounds */
  --overlay-dark: rgba(0,0,0,0.7);
  --overlay-medium: rgba(0,0,0,0.5);
  --overlay-light: rgba(0,0,0,0.3);
  --overlay-white-light: rgba(255,255,255,0.1);
  --overlay-white-medium: rgba(255,255,255,0.2);
  --overlay-white-heavy: rgba(255,255,255,0.3);

  --selection-bg: rgba(96,165,250,.28);

  /* Dark shadows often look better with BOTH depth + subtle edge */
  --shadow-1: 0 1px 2px rgba(0,0,0,.55);
  --shadow-2: 0 10px 28px rgba(0,0,0,.60);
  --shadow-3: 0 18px 50px rgba(0,0,0,.65);
  --edge-highlight: rgba(255,255,255,.06);

  /* Legacy aliases for backward compatibility */
  --bg-primary: #111B2E;
  --bg-secondary: #162443;
  --bg-tertiary: #1B2B4A;
  --panel: #111B2E;
  --border: #24324A;
  --border-color: #64748B;
  --text: #F8FAFC;
  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  --text-light: #F8FAFC;
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-light: rgba(37,99,235,.20);
  --error: #EF4444;
  --shadow: rgba(0,0,0,.55);

  /* Shadows (legacy) */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.55);
  --shadow-md: 0 10px 28px rgba(0,0,0,.60);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.60);
  --shadow-xl: 0 18px 50px rgba(0,0,0,.65);
}

/* Helpful defaults */
html {
  color-scheme: light dark;
}

::selection {
  background: var(--selection-bg);
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-1);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-1);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-2);
}

a {
  color: var(--link);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--link-hover);
}

a:visited {
  color: var(--link-visited);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--focus-outer);
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}

.btn-primary:active {
  background: var(--primary-active);
  border-color: var(--primary-active);
  transform: translateY(0);
}

.btn-secondary {
  background: var(--secondary-bg);
  color: var(--on-secondary);
  border-color: var(--border-2);
}

.btn-secondary:hover {
  background: var(--secondary-hover);
  border-color: var(--border-2);
}

.btn-secondary:active {
  background: var(--secondary-active);
}

.btn-success {
  background: var(--success);
  color: var(--on-success);
  border-color: var(--success);
}

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

.btn-success:active {
  background: var(--success-active);
  border-color: var(--success-active);
}

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

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

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-1);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  color: var(--text-1);
  background: var(--surface-1);
  border: 2px solid var(--border-2);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-placeholder);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-color: var(--focus);
  box-shadow: 0 0 0 4px var(--focus-outer);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-error {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--danger);
}

.form-help {
  display: block;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-3);
}

/* Cards */
.card {
  background: var(--surface-1);
  border: 1px solid var(--border-1);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-1);
}

.card:hover {
  box-shadow: var(--shadow-2);
  border-color: var(--border-2);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success {
  background: var(--success);
  color: var(--on-success);
}

.badge-warning {
  background: var(--warning);
  color: var(--on-warning);
}

.badge-error,
.badge-danger {
  background: var(--danger);
  color: var(--on-danger);
}

.badge-info {
  background: var(--info);
  color: var(--on-info);
}

/* Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--text-3);
}

.text-primary {
  color: var(--text-1);
}

.text-secondary {
  color: var(--text-2);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Loading States */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-1);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Empty States */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-3);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

/* Error States */
.error-state {
  padding: var(--spacing-lg);
  background: var(--surface-2);
  border: 2px solid var(--danger);
  border-radius: var(--radius-md);
  color: var(--danger);
}

/* Alert States */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  margin-bottom: var(--spacing-md);
}

.alert-success {
  background: var(--success);
  color: var(--on-success);
  border-color: var(--success-hover);
}

.alert-warning {
  background: var(--warning);
  color: var(--on-warning);
  border-color: var(--warning-hover);
}

.alert-danger {
  background: var(--danger);
  color: var(--on-danger);
  border-color: var(--danger-hover);
}

.alert-info {
  background: var(--info);
  color: var(--on-info);
  border-color: var(--info-hover);
}

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  h1 { font-size: var(--font-size-2xl); }
  h2 { font-size: var(--font-size-xl); }
  h3 { font-size: var(--font-size-lg); }
}