/* ==========================================================================
   School Management System - Branding Stylesheet
   Theme: Orange (#FF6B35), Dark Blue (#1E3A8A), White (#FFFFFF)
   ========================================================================== */

:root {
  /* Primary Colors - Orange */
  --brand-primary: #FF6B35;
  --brand-primary-light: #FF8C5A;
  --brand-primary-lighter: #FFB088;
  --brand-primary-dark: #E55A28;
  --brand-primary-darker: #CC4A1A;
  
  /* Secondary Colors - Dark Blue */
  --brand-secondary: #1E3A8A;
  --brand-secondary-light: #2563EB;
  --brand-secondary-lighter: #60A5FA;
  --brand-secondary-dark: #1E40AF;
  --brand-secondary-darker: #172554;
  
  /* Accent Colors - White */
  --brand-accent: #FFFFFF;
  --brand-white: #FFFFFF;
  --brand-off-white: #F9FAFB;
  --brand-light-gray: #F3F4F6;
  
  /* Neutral Grays */
  --brand-gray-50: #F9FAFB;
  --brand-gray-100: #F3F4F6;
  --brand-gray-200: #E5E7EB;
  --brand-gray-300: #D1D5DB;
  --brand-gray-400: #9CA3AF;
  --brand-gray-500: #6B7280;
  --brand-gray-600: #4B5563;
  --brand-gray-700: #374151;
  --brand-gray-800: #1F2937;
  --brand-gray-900: #111827;
  
  /* Semantic Colors */
  --brand-success: #10B981;
  --brand-warning: #F59E0B;
  --brand-error: #EF4444;
  --brand-info: #3B82F6;
  
  /* Light Tints */
  --brand-orange-tint: #FFF7F5;
  --brand-blue-tint: #F0F4FF;
  
  /* Button Colors */
  --btn-primary-bg: #FF6B35;
  --btn-primary-text: #FFFFFF;
  --btn-primary-hover: #E55A28;
  --btn-primary-active: #CC4A1A;
  --btn-secondary-bg: #1E3A8A;
  --btn-secondary-text: #FFFFFF;
  --btn-secondary-hover: #1E40AF;
  --btn-secondary-active: #172554;
  
  /* Navigation */
  --nav-bg: #1E3A8A;
  --nav-text: #FFFFFF;
  --nav-active: #FF6B35;
  --nav-hover: #2563EB;
  
  /* Backgrounds */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-accent: #FFF7F5;
  
  /* Text Colors */
  --text-primary: #111827;
  --text-secondary: #4B5563;
  --text-muted: #6B7280;
  --text-link: #FF6B35;
  
  /* Borders */
  --border-primary: #E5E7EB;
  --border-secondary: #D1D5DB;
  --border-focus: #FF6B35;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-base: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
}

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

/* Base Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  gap: 8px;
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.2);
}

.btn:disabled,
.btn.disabled {
  background-color: var(--brand-gray-200);
  color: var(--brand-gray-400);
  cursor: not-allowed;
  opacity: 0.6;
}

/* Primary Button - Orange */
.btn-primary {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--btn-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--btn-primary-active);
  transform: translateY(0);
}

/* Secondary Button - Dark Blue */
.btn-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--btn-secondary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary:active:not(:disabled) {
  background-color: var(--btn-secondary-active);
  transform: translateY(0);
}

/* Outline Button */
.btn-outline {
  background-color: var(--brand-white);
  color: var(--brand-secondary);
  border: 2px solid var(--brand-secondary);
  padding: 10px 22px; /* Adjusted for border */
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--brand-off-white);
  border-color: var(--brand-secondary-dark);
  color: var(--brand-secondary-dark);
}

.btn-outline:active:not(:disabled) {
  background-color: var(--brand-gray-100);
}

/* Ghost Button */
.btn-ghost {
  background-color: transparent;
  color: var(--brand-primary);
}

.btn-ghost:hover:not(:disabled) {
  background-color: var(--brand-orange-tint);
  color: var(--brand-primary-dark);
}

.btn-ghost:active:not(:disabled) {
  background-color: rgba(255, 107, 53, 0.15);
}

/* Success Button */
.btn-success {
  background-color: var(--brand-success);
  color: var(--brand-white);
}

.btn-success:hover:not(:disabled) {
  background-color: #059669;
}

/* Danger Button */
.btn-danger {
  background-color: var(--brand-error);
  color: var(--brand-white);
}

.btn-danger:hover:not(:disabled) {
  background-color: #DC2626;
}

/* Warning Button */
.btn-warning {
  background-color: var(--brand-warning);
  color: var(--brand-white);
}

.btn-warning:hover:not(:disabled) {
  background-color: #D97706;
}

/* Button Sizes */
.btn-sm {
  padding: 8px 16px;
  font-size: 12px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
}

.btn-xl {
  padding: 20px 40px;
  font-size: 18px;
}

/* Icon Buttons */
.btn-icon {
  padding: 12px;
  width: 44px;
  height: 44px;
}

.btn-icon-sm {
  padding: 8px;
  width: 36px;
  height: 36px;
}

.btn-icon-lg {
  padding: 16px;
  width: 52px;
  height: 52px;
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.navbar {
  background-color: var(--nav-bg);
  color: var(--nav-text);
  height: 64px;
  box-shadow: var(--shadow-base);
}

.nav-link {
  color: var(--nav-text);
  padding: 12px 20px;
  text-decoration: none;
  transition: all 0.2s ease;
  border-radius: var(--radius-md);
}

.nav-link:hover {
  background-color: var(--nav-hover);
  color: var(--nav-text);
}

.nav-link.active {
  background-color: var(--nav-active);
  color: var(--nav-text);
  font-weight: 600;
}

/* Sidebar */
.sidebar {
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-primary);
  min-height: 100vh;
}

.sidebar-link {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  gap: 12px;
}

.sidebar-link:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.sidebar-link.active {
  background-color: var(--brand-orange-tint);
  color: var(--brand-primary);
  border-left-color: var(--brand-primary);
  font-weight: 600;
}

.sidebar-link .icon {
  color: inherit;
  width: 20px;
  height: 20px;
}

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

.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-header {
  padding-bottom: 16px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-primary);
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

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

.card-footer {
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid var(--border-primary);
}

/* ==========================================================================
   FORMS
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--brand-gray-700);
  margin-bottom: 6px;
}

.form-label.required::after {
  content: '*';
  color: var(--brand-error);
  margin-left: 4px;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  transition: all 0.2s ease;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--brand-error);
}

.form-input.error:focus,
.form-select.error:focus,
.form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--brand-error);
}

.form-help {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Checkbox & Radio */
.form-check {
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-check-input {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--brand-primary);
}

.form-check-label {
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
}

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

.table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.table thead {
  background-color: var(--brand-secondary);
  color: var(--brand-white);
}

.table th {
  padding: 16px;
  text-align: left;
  font-weight: 600;
  font-size: 14px;
}

.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-primary);
  font-size: 14px;
  color: var(--text-secondary);
}

.table tbody tr:nth-child(even) {
  background-color: var(--bg-secondary);
}

.table tbody tr:hover {
  background-color: var(--brand-orange-tint);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* ==========================================================================
   BADGES & TAGS
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
}

.badge-primary {
  background-color: var(--brand-orange-tint);
  color: var(--brand-primary);
  border-color: var(--brand-primary-light);
}

.badge-secondary {
  background-color: var(--brand-blue-tint);
  color: var(--brand-secondary);
  border-color: var(--brand-secondary-light);
}

.badge-success {
  background-color: #D1FAE5;
  color: #065F46;
  border-color: var(--brand-success);
}

.badge-warning {
  background-color: #FEF3C7;
  color: #92400E;
  border-color: var(--brand-warning);
}

.badge-danger {
  background-color: #FEE2E2;
  color: #991B1B;
  border-color: var(--brand-error);
}

.badge-info {
  background-color: #DBEAFE;
  color: #1E40AF;
  border-color: var(--brand-info);
}

/* ==========================================================================
   ALERTS
   ========================================================================== */

.alert {
  padding: 16px;
  border-radius: var(--radius-md);
  border-left: 4px solid;
  display: flex;
  align-items: start;
  gap: 12px;
}

.alert-success {
  background-color: #D1FAE5;
  border-color: var(--brand-success);
  color: #065F46;
}

.alert-info {
  background-color: #DBEAFE;
  border-color: var(--brand-info);
  color: #1E40AF;
}

.alert-warning {
  background-color: #FEF3C7;
  border-color: var(--brand-warning);
  color: #92400E;
}

.alert-error {
  background-color: #FEE2E2;
  border-color: var(--brand-error);
  color: #991B1B;
}

.alert-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */

/* Text Colors */
.text-primary { color: var(--brand-primary); }
.text-secondary { color: var(--brand-secondary); }
.text-white { color: var(--brand-white); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--brand-success); }
.text-warning { color: var(--brand-warning); }
.text-error { color: var(--brand-error); }

/* Background Colors */
.bg-primary { background-color: var(--brand-primary); }
.bg-secondary { background-color: var(--brand-secondary); }
.bg-white { background-color: var(--brand-white); }
.bg-gray { background-color: var(--bg-secondary); }
.bg-orange-tint { background-color: var(--brand-orange-tint); }

/* Links */
a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--brand-primary-dark);
  text-decoration: underline;
}

/* Divider */
.divider {
  height: 1px;
  background-color: var(--border-primary);
  margin: var(--space-lg) 0;
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--brand-gray-200);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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