/* ==================== CSS Variables ==================== */
:root {
  /* Colors */
  --color-primary: #3498db;
  --color-primary-hover: #2980b9;
  --color-secondary: #7f8c8d;
  --color-success: #27ae60;
  --color-success-light: #d4edda;
  --color-success-dark: #155724;
  --color-danger: #e74c3c;
  --color-danger-light: #f8d7da;
  --color-danger-dark: #721c24;
  --color-warning: #f39c12;
  --color-warning-light: #fff3cd;
  --color-warning-dark: #856404;
  --color-info: #3498db;
  --color-info-light: #e8f4f8;
  --color-dark: #2c3e50;
  --color-muted: #7f8c8d;
  
  /* Neutral colors */
  --color-white: #ffffff;
  --color-black: #000000;
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* Text colors */
  --text-primary: var(--color-gray-900);
  --text-secondary: var(--color-gray-600);
  --text-muted: var(--color-muted);
  
  /* Background colors */
  --bg-body: var(--color-gray-50);
  --bg-card: var(--color-white);
  --bg-sidebar: var(--color-dark);
  
  /* Spacing */
  --spacing-xs: 0.25rem;    /* 4px */
  --spacing-sm: 0.5rem;     /* 8px */
  --spacing-md: 1rem;       /* 16px */
  --spacing-lg: 1.5rem;     /* 24px */
  --spacing-xl: 2rem;       /* 32px */
  --spacing-2xl: 3rem;      /* 48px */
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 0 8px 0 rgb(0 0 0 / 0.08);
  --shadow-lg: 0 0 15px 0 rgb(0 0 0 / 0.12);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", 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;
}


/* ==================== Base & Reset ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 600;
  line-height: 1.2;
}

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);
}

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

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

ul, ol {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}


/* ==================== Layout ==================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.container-sm {
  max-width: 640px;
}

.container-lg {
  max-width: 1440px;
}


/* ==================== Components: Buttons ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  color: var(--color-white);
  background-color: var(--color-primary-hover);
  text-decoration: none;
}

.btn-secondary {
  color: var(--text-primary);
  background-color: var(--color-gray-200);
  border-color: var(--color-gray-300);
}

.btn-secondary:hover:not(:disabled) {
  color: var(--text-primary);
  background-color: var(--color-gray-300);
  text-decoration: none;
}

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

.btn-danger:hover:not(:disabled) {
  color: var(--color-white);
  background-color: #b91c1c;
  text-decoration: none;
}

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

.btn-success:hover:not(:disabled) {
  color: var(--color-white);
  background-color: #15803d;
  text-decoration: none;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}


/* ==================== Components: Content Blocks ==================== */
.content {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.content-header {
  padding: var(--spacing-lg);
  padding-bottom: 0;
}

.content-body {
  padding: var(--spacing-lg);
}

.content-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-gray-200);
  background-color: var(--color-gray-50);
}

.content-title {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.page-title-block {
  padding: var(--spacing-sm) var(--spacing-lg);
  box-shadow: var(--shadow-lg);
}

.page-title {
  margin: 0;
  font-size: var(--font-size-3xl);
  font-weight: 600;
}

.page-subtitle {
  margin: 0;
  color: var(--text-muted);
  font-size: var(--font-size-base);
}


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

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-label .text-danger,
.form-label .required {
  color: var(--color-danger);
}

.form-label-required::after {
  content: " *";
  color: var(--color-danger);
}

.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control:disabled {
  background-color: var(--color-gray-100);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-control.is-invalid {
  border-color: var(--color-danger);
}

.form-control.is-invalid:focus {
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

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

select.form-control {
  cursor: pointer;
}

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

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

.checkbox-wrapper,
.radio-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.checkbox-wrapper input[type="checkbox"],
.radio-wrapper input[type="radio"] {
  width: 1rem;
  height: 1rem;
  cursor: pointer;
}


/* ==================== Components: Alerts ==================== */
/* Success and error messages */
.success-message {
    background: var(--color-success-light);
    border-left: 4px solid var(--color-success);
    padding: 15px var(--spacing-lg);
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-success-dark);
}

.error-message {
    background: var(--color-danger-light);
    border-left: 4px solid var(--color-danger);
    padding: 15px var(--spacing-lg);
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-danger-dark);
}

.warning-message {
    background: var(--color-warning-light);
    border-left: 4px solid var(--color-warning);
    padding: 15px var(--spacing-lg);
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-warning-dark);
}

.info-box {
    background: var(--color-info-light);
    border-left: 4px solid var(--color-info);
    padding: 15px var(--spacing-lg);
    margin-bottom: 20px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--color-dark);
}

.info-box h4 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--color-dark);
}

.info-box ul {
    margin-left: 0;
    color: var(--text-secondary);
}

.info-box ol {
    margin-left: 0;
    color: var(--text-secondary);
}

.info-box p {
    margin: 10px 0;
}

.alert {
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  border-left-width: 4px;
  border-left-style: solid;
}

.alert-success {
  color: #065f46;
  background-color: #d1fae5;
  border-color: #6ee7b7;
  border-left-color: var(--color-success);
}

.alert-danger {
  color: #991b1b;
  background-color: #fee2e2;
  border-color: #fca5a5;
  border-left-color: var(--color-danger);
}

.alert-warning {
  color: #92400e;
  background-color: #fef3c7;
  border-color: #fcd34d;
  border-left-color: var(--color-warning);
}

.alert-info {
  color: #065f46;
  background-color: #e8f4f8;
  border-color: #b3dce8;
  border-left-color: var(--color-primary);
}


/* ==================== Components: Tables ==================== */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-md);
}

.table th,
.table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

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

.table th:last-child,
.table td:last-child {
  border-right: none;
}

.table th {
  font-weight: 600;
  color: white;
  background-color: var(--color-dark);
}

.table tbody tr:hover {
  background-color: var(--color-gray-50);
}

.table tbody tr[style*="cursor: pointer"]:hover {
  background-color: var(--color-gray-200);
}

.table-striped tbody tr:nth-child(odd) {
  background-color: var(--color-gray-50);
}

/* Mobile card view for tables */
@media (max-width: 768px) {
  .table-wrapper.mobile-cards .table thead {
    display: none;
  }
  
  .table-wrapper.mobile-cards .table,
  .table-wrapper.mobile-cards .table tbody,
  .table-wrapper.mobile-cards .table tr {
    display: block;
    width: 100%;
  }
  
  .table-wrapper.mobile-cards .table tr {
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    background-color: var(--bg-card);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
  }
  
  .table-wrapper.mobile-cards .table tr:hover {
    box-shadow: var(--shadow-md);
  }
  
  .table-wrapper.mobile-cards .table td {
    display: block;
    text-align: left;
    padding: var(--spacing-xs) 0;
    border: none;
  }
  
  .table-wrapper.mobile-cards .table td:before {
    content: attr(data-label);
    font-weight: 600;
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
  }
  
  .table-wrapper.mobile-cards .table td:not(:last-child) {
    border-bottom: 1px solid var(--color-gray-100);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
  }
}


/* ==================== Components: Badges ==================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius-full);
}

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

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

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

.badge-warning {
  color: #78350f;
  background-color: var(--color-warning);
}

.badge-secondary {
  color: var(--color-white);
  background-color: var(--color-secondary);
}


/* ==================== Utility Classes ==================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }

.mb-0 { margin-bottom: 0; }
.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); }

.mt-0 { margin-top: 0; }
.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); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-inline { display: inline; }
.d-inline-block { display: inline-block; }

.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }


/* ==================== Page: Login ==================== */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);
}

.login-card {
  width: 100%;
  max-width: 400px;
}

.login-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-header h1 {
  margin-bottom: var(--spacing-sm);
}


/* ==================== Layout & Sidebar ==================== */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  background: #2c3e50;
  color: white;
  width: 250px;
  padding: 0;
}

.sidebar-header {
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
  font-size: var(--font-size-lg);
  margin-bottom: 0;
  color: white;
}

.sidebar-header p {
  margin: 0;
  color: #95a5a6;
  font-size: var(--font-size-xs);
}

.nav {
  list-style: none;
  padding: 0 var(--spacing-xs);
  margin: 0;
}

.nav-item {
  margin-bottom: 2px;
}

.nav-heading {
  padding: var(--spacing-xs) var(--spacing-sm);
  color: #95a5a6;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0;
  margin-bottom: 2px;
}

.nav-heading:first-child {
  margin-top: 0;
}

.nav-heading-bottom {
  margin-top: auto;
  padding-top: var(--spacing-md);
}

.nav-link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: white;
  background: #34495e;
  border-left: 3px solid #34495e;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-size: var(--font-size-sm);
}

.nav-link:hover {
  color: white;
  background: #4a5f7f;
  border-left-color: #3498db;
  text-decoration: none;
}

.nav-link.active {
  color: white;
  background: #3498db;
  border-left-color: #2980b9;
}

.nav-link.submenu {
  padding-left: calc(var(--spacing-sm) + var(--spacing-xs));
  background: #273849;
  font-size: 0.8rem;
}

.nav-link.submenu:hover {
  background: #34495e;
}

.nav-link.submenu.active {
  background: #2980b9;
}

.main-content {
  flex: 1;
  padding: var(--spacing-xl);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-200);
}

.user-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}


/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
  }
  
  .main-content {
    padding: var(--spacing-md);
  }
  
  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: var(--spacing-sm);
  }
  
  .content {
    border-radius: var(--radius-md);
  }
  
  .content-body {
    padding: var(--spacing-sm);
  }
  
  .content-header {
    padding: var(--spacing-sm);
  }
  
  .content-footer {
    padding: var(--spacing-sm);
  }
  
  .info-box,
  .success-message,
  .error-message,
  .warning-message {
    padding: 15px var(--spacing-sm);
  }
}

/* ==================== Utility Classes ==================== */
.form-row {
  display: flex;
  gap: var(--spacing-sm);
}

.flex-1 {
  flex: 1;
}

.status-active {
  color: var(--color-success);
}

.status-inactive {
  color: var(--color-gray-400);
}