/* ==========================================================================
   MAIN CSS - DESIGN SYSTEM & BASE STYLES
   ========================================================================== */

:root {
  /* Color Palette */
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-focus: rgba(79, 70, 229, 0.25);

  --secondary: #0ea5e9;
  --secondary-hover: #0284c7;
  --secondary-light: #f0f9ff;

  --success: #10b981;
  --success-light: #ecfdf5;
  --success-text: #065f46;

  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --warning-text: #92400e;

  --danger: #ef4444;
  --danger-light: #fef2f2;
  --danger-text: #991b1b;

  --info: #3b82f6;
  --info-light: #eff6ff;

  /* Neutrals */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-secondary: #f1f5f9;
  --bg-card: #ffffff;

  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-inverse: #ffffff;

  --border-color: #e2e8f0;
  --border-focus: #6366f1;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Borders & Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout dimensions */
  --sidebar-width: 260px;
  --header-height: 68px;
  --bottom-nav-height: 64px;
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

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

html, body {
  height: 100%;
  font-family: var(--font-family);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.125rem;
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  user-select: none;
  border: 1px solid transparent;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(79, 70, 229, 0.25);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #4f46e5 100%);
  box-shadow: 0 4px 10px rgba(79, 70, 229, 0.35);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-surface-secondary);
  border-color: #cbd5e1;
}

.btn-success {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
}

.btn-success:hover:not(:disabled) {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
}

.btn-danger {
  background-color: var(--danger-light);
  color: var(--danger-text);
  border-color: rgba(239, 68, 68, 0.2);
}

.btn-danger:hover:not(:disabled) {
  background-color: #fee2e2;
  color: #b91c1c;
}

.btn-danger-solid {
  background: var(--danger);
  color: #ffffff;
}

.btn-danger-solid:hover:not(:disabled) {
  background: #dc2626;
}

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

.btn-outline:hover:not(:disabled) {
  background-color: var(--primary-light);
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.5rem;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon-sm {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

/* ==========================================================================
   FORM CONTROLS
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-main);
}

.form-label .required {
  color: var(--danger);
  margin-left: 2px;
}

.form-control, .form-select {
  width: 100%;
  padding: 0.65rem 0.875rem;
  font-size: var(--font-size-sm);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  color: var(--text-main);
  transition: all var(--transition-fast);
  outline: none;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-focus);
}

.form-control::placeholder {
  color: var(--text-light);
}

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

.form-error {
  font-size: var(--font-size-xs);
  color: var(--danger);
  margin-top: 2px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

/* Input group */
.input-group {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.input-group .input-icon {
  position: absolute;
  left: 0.875rem;
  color: var(--text-muted);
  pointer-events: none;
}

.input-group .form-control {
  padding-left: 2.5rem;
}

/* ==========================================================================
   BADGES & CHIPS
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.25rem 0.625rem;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  line-height: 1;
}

.badge-success {
  background-color: var(--success-light);
  color: var(--success-text);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-warning {
  background-color: var(--warning-light);
  color: var(--warning-text);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.badge-danger {
  background-color: var(--danger-light);
  color: var(--danger-text);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.badge-info {
  background-color: var(--info-light);
  color: #1e40af;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.badge-neutral {
  background-color: var(--bg-surface-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.badge-primary {
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(79, 70, 229, 0.2);
}

/* ==========================================================================
   CARDS
   ========================================================================== */

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  overflow: hidden;
}

.card-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.card-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  color: var(--text-main);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  background-color: var(--bg-surface-secondary);
  border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   TABLES
   ========================================================================== */

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: var(--font-size-sm);
}

.table th {
  padding: 0.75rem 1rem;
  background-color: var(--bg-surface-secondary);
  color: var(--text-muted);
  font-weight: 600;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.table td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
}

.table tbody tr {
  transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
  background-color: rgba(248, 250, 252, 0.8);
}