/* CNA Institute - Clean Design System with Dark Mode Support */

:root {
  /* Brand Colors */
  --color-primary: #0078CD;
  --color-primary-hover: #0065b3;
  --color-primary-light: #eff9ff;

  /* Semantic Colors - Light Mode (Google-inspired soft palette) */
  --color-surface: 255 255 255;
  --color-surface-secondary: 249 250 251;
  --color-surface-tertiary: 243 244 246;
  --color-content: 26 28 30;
  --color-content-secondary: 95 99 104;
  --color-content-tertiary: 128 134 139;
  --color-edge: 243 244 246;
  --color-edge-strong: 229 231 235;
  --color-hover: 243 244 246;

  /* Shadows (soft, multi-layer) */
  --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.1), 0 1px 3px 1px rgba(60, 64, 67, 0.08);
  --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.15), 0 4px 8px 3px rgba(60, 64, 67, 0.1);
  --shadow-lg: 0 4px 8px 3px rgba(60, 64, 67, 0.15), 0 1px 3px rgba(60, 64, 67, 0.2);

  /* Status Colors */
  --color-success: #34a853;
  --color-success-bg: #e6f4ea;
  --color-warning: #f9ab00;
  --color-warning-bg: #fef7e0;
  --color-danger: #ea4335;
  --color-danger-bg: #fce8e6;
  --color-info: #4285f4;
  --color-info-bg: #e8f0fe;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Border Radius (larger, softer) */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 999px;
  --border-radius: 12px;
}

/* Dark Mode Colors (pure dark, Google-inspired) */
.dark {
  --color-surface: 17 17 17;
  --color-surface-secondary: 26 26 26;
  --color-surface-tertiary: 38 38 38;
  --color-content: 232 234 237;
  --color-content-secondary: 154 160 166;
  --color-content-tertiary: 128 134 139;
  --color-edge: 38 38 38;
  --color-edge-strong: 55 55 55;
  --color-hover: 32 32 32;
  --color-primary-light: rgba(0, 120, 205, 0.12);

  /* Dark mode shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 4px 8px 3px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 4px 8px 3px rgba(0, 0, 0, 0.4), 0 1px 3px rgba(0, 0, 0, 0.3);

  /* Status colors adjusted for dark */
  --color-success-bg: rgba(52, 168, 83, 0.12);
  --color-warning-bg: rgba(249, 171, 0, 0.12);
  --color-danger-bg: rgba(234, 67, 53, 0.12);
  --color-info-bg: rgba(66, 133, 244, 0.12);
}

/* Global Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  color: rgb(var(--color-content));
  background-color: rgb(var(--color-surface-secondary));
  font-size: 0.875rem;
  line-height: 1.25rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Clean Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: rgb(var(--color-surface-tertiary));
}

::-webkit-scrollbar-thumb {
  background: rgb(var(--color-edge-strong));
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgb(var(--color-content-tertiary));
}

/* Typography - Lighter weights for softer feel */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  color: rgb(var(--color-content));
  letter-spacing: -0.01em;
}

h1 { font-size: 1.875rem; line-height: 2.25rem; font-weight: 400; }
h2 { font-size: 1.5rem; line-height: 2rem; font-weight: 400; }
h3 { font-size: 1.25rem; line-height: 1.75rem; }
h4 { font-size: 1.125rem; line-height: 1.75rem; }
h5 { font-size: 1rem; line-height: 1.5rem; }
h6 { font-size: 0.875rem; line-height: 1.25rem; }

/* Buttons - Soft, rounded Google-style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  outline: none;
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: rgb(var(--color-surface));
  color: rgb(var(--color-content));
  border: 1px solid rgb(var(--color-edge-strong));
}

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

.btn-danger {
  background-color: var(--color-danger);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
  background-color: #c5221f;
  box-shadow: var(--shadow-md);
}

.btn-warning {
  background-color: var(--color-warning);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-warning:hover {
  background-color: #e69500;
  box-shadow: var(--shadow-md);
}

.btn-ghost {
  background-color: transparent;
  color: rgb(var(--color-content-secondary));
}

.btn-ghost:hover {
  background-color: rgb(var(--color-hover));
  color: rgb(var(--color-content));
}

/* Cards - Soft shadows, no borders for clean look */
.card {
  background-color: rgb(var(--color-surface));
  border-radius: var(--radius-md);
  border: none;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid rgb(var(--color-edge));
  background-color: rgb(var(--color-surface));
}

.card-body {
  padding: 1.25rem;
}

.card-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgb(var(--color-edge));
  background-color: rgb(var(--color-surface-secondary));
}

/* Forms - Soft, rounded inputs */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgb(var(--color-content));
  margin-bottom: 0.375rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  border: 1px solid rgb(var(--color-edge));
  border-radius: var(--radius-md);
  background-color: rgb(var(--color-surface));
  color: rgb(var(--color-content));
  transition: border-color 0.2s ease;
  box-shadow: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: rgb(var(--color-content-tertiary));
}

.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: rgb(var(--color-edge-strong));
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: none;
}

/* Checkbox - Rounded */
.form-checkbox {
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 4px;
  border: 1.5px solid rgb(var(--color-edge-strong));
  cursor: pointer;
  transition: all 0.15s ease;
}

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

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
}

.table thead {
  background-color: rgb(var(--color-surface-secondary));
  border-bottom: 1px solid rgb(var(--color-edge));
}

.table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgb(var(--color-content-secondary));
}

.table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid rgb(var(--color-edge));
  font-size: 0.875rem;
  color: rgb(var(--color-content));
}

.table tbody tr:hover {
  background-color: rgb(var(--color-surface-secondary));
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: 0.25rem;
}

.badge-primary {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background-color: #dcfce7;
  color: var(--color-success);
}

.dark .badge-success {
  background-color: rgba(22, 163, 74, 0.2);
}

.badge-warning {
  background-color: #fef3c7;
  color: var(--color-warning);
}

.dark .badge-warning {
  background-color: rgba(245, 158, 11, 0.2);
}

.badge-danger {
  background-color: #fee2e2;
  color: var(--color-danger);
}

.dark .badge-danger {
  background-color: rgba(220, 38, 38, 0.2);
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--border-radius);
  border-left: 4px solid;
  margin-bottom: 1rem;
}

.alert-info {
  background-color: #f0f9ff;
  border-left-color: var(--color-info);
  color: #0c4a6e;
}

.dark .alert-info {
  background-color: rgba(14, 165, 233, 0.15);
  color: #7dd3fc;
}

.alert-success {
  background-color: #dcfce7;
  border-left-color: var(--color-success);
  color: #14532d;
}

.dark .alert-success {
  background-color: rgba(22, 163, 74, 0.15);
  color: #86efac;
}

.alert-warning {
  background-color: #fef3c7;
  border-left-color: var(--color-warning);
  color: #713f12;
}

.dark .alert-warning {
  background-color: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

.alert-danger {
  background-color: #fee2e2;
  border-left-color: var(--color-danger);
  color: #7f1d1d;
}

.dark .alert-danger {
  background-color: rgba(220, 38, 38, 0.15);
  color: #fca5a5;
}

/* Navigation */
.nav-item {
  display: flex;
  align-items: center;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgb(var(--color-content-secondary));
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all 150ms ease;
}

.nav-item:hover {
  background-color: rgb(var(--color-surface-secondary));
  color: rgb(var(--color-content));
}

.nav-item.active {
  background-color: rgb(var(--color-surface-tertiary));
  color: rgb(var(--color-content));
}

.nav-icon {
  width: 1.25rem;
  height: 1.25rem;
  margin-right: 0.75rem;
  color: rgb(var(--color-content-tertiary));
}

.nav-item:hover .nav-icon,
.nav-item.active .nav-icon {
  color: rgb(var(--color-content-secondary));
}

/* Utility Classes */
.text-primary { color: var(--color-primary); }
.text-secondary { color: rgb(var(--color-content-secondary)); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-muted { color: rgb(var(--color-content-secondary)); }

.bg-primary { background-color: var(--color-primary); }

.border { border: 1px solid rgb(var(--color-edge)); }
.border-top { border-top: 1px solid rgb(var(--color-edge)); }
.border-bottom { border-bottom: 1px solid rgb(var(--color-edge)); }
.border-left { border-left: 1px solid rgb(var(--color-edge)); }
.border-right { border-right: 1px solid rgb(var(--color-edge)); }

.rounded { border-radius: var(--border-radius); }
.rounded-lg { border-radius: 0.75rem; }
.rounded-full { border-radius: 9999px; }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Smooth transitions for all interactive elements */
a, button, input, select, textarea {
  transition: all 0.2s ease;
}