/* ============ Global Design System ============ */

/* CSS Variables */
:root {
  /* Colors */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  
  --accent: #ec4899;
  --accent-dark: #be185d;
  --accent-light: #f472b6;
  
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* Neutrals */
  --bg: #f9fafb;
  --bg-secondary: #f3f4f6;
  --bg-tertiary: #e5e7eb;
  --surface: #ffffff;
  
  --text: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  
  --border: #e5e7eb;
  --border-dark: #d1d5db;
  
  /* 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-mono: 'Monaco', 'Courier New', monospace;
  
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Transitions */
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);

  --page-gradient:
    radial-gradient(circle at 10% 0%, #dfe5ff 0%, transparent 38%),
    radial-gradient(circle at 85% 15%, #ffe8f2 0%, transparent 34%),
    linear-gradient(180deg, #f8faff 0%, #f4f7ff 52%, #f7f9fd 100%);
}

/* ============ Base Styles ============ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--text);
  background: var(--page-gradient);
  background-attachment: fixed;
  line-height: var(--line-height-normal);
  font-size: var(--text-base);
}

/* ============ Layout Structure ============ */

.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.layout-header {
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid #dbe2ff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.layout-content {
  flex: 1;
  padding: var(--spacing-lg);
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.layout-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  color: var(--text-secondary);
  font-size: var(--text-sm);
}

/* ============ Header ============ */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  position: relative;
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  gap: var(--spacing-md);
}

#unified-menu-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  position: relative;
  z-index: 500;
}

.unified-user-avatar {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.3);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.unified-user-avatar:hover {
  transform: scale(1.05);
  border-color: rgba(255, 255, 255, 0.5);
}

.unified-user-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 220px;
  z-index: 10000;
}

.unified-user-menu > div {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: background 0.15s ease;
}

.unified-user-menu > div:hover {
  background: var(--bg-secondary);
}

.unified-user-menu > div:first-child {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
  cursor: default;
}

.unified-user-menu > div:first-child:hover {
  background: transparent;
}

.unified-user-menu > div:last-child {
  border-top: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #3744c8;
  text-decoration: none;
  transition: var(--transition);
}

.logo:hover {
  color: #2f3ab2;
}

/* ============ Typography ============ */

h1 {
  font-size: var(--text-3xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

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

/* ============ Buttons ============ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  border: none;
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  font-family: inherit;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button Variants */

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--border-dark);
  transform: translateY(-1px);
}

.btn-secondary:active:not(:disabled) {
  transform: scale(0.98);
}

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

.btn-danger:hover:not(:disabled) {
  background: #dc2626;
  transform: translateY(-1px);
}

.btn-danger:active:not(:disabled) {
  transform: scale(0.98);
}

.btn-ghost {
  background: transparent;
  color: var(--primary);
  border: none;
}

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

.btn-small {
  padding: 4px 12px;
  font-size: var(--text-sm);
}

.btn-large {
  padding: 12px 24px;
  font-size: var(--text-lg);
}

/* ============ Cards ============ */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: var(--transition);
}

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

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

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.card-body {
  margin-bottom: var(--spacing-md);
}

.card-footer {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* ============ Grid ============ */

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* ============ Stat Cards ============ */

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
}

.stat-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text);
}

.stat-change {
  font-size: var(--text-sm);
  color: var(--success);
}

.stat-change.negative {
  color: var(--danger);
}

/* ============ Forms ============ */

.form-group {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-direction: column;
}

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

.form-input,
.form-select,
.form-textarea {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--text-base);
  transition: var(--transition);
  background: var(--surface);
  color: var(--text);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

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

/* ============ Tables ============ */

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

.table thead {
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border);
}

.table th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: var(--text-xs);
}

.table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border);
}

.table tbody tr:hover {
  background: var(--bg-secondary);
}

/* ============ Badges ============ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 600;
  white-space: nowrap;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* ============ Alerts ============ */

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

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-color: var(--info);
  color: #1e40af;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: #065f46;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: #78350f;
}

.alert-danger {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: #7f1d1d;
}

/* ============ Modals ============ */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-overlay.show {
  display: flex;
}

.modal-content {
  background: var(--surface);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ============ Responsive ============ */

@media (max-width: 768px) {
  .layout-content {
    padding: var(--spacing-md);
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
  
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  h1 {
    font-size: var(--text-2xl);
  }
  
  .table {
    font-size: var(--text-xs);
  }
  
  .table th,
  .table td {
    padding: var(--spacing-sm);
  }
}

/* ============ Utility Classes ============ */

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

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

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

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

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

.text-muted { color: var(--text-secondary); }
.text-small { font-size: var(--text-sm); }
.text-large { font-size: var(--text-lg); }

.hidden { display: none; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.cursor-pointer { cursor: pointer; }
.pointer-events-none { pointer-events: none; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: 999px; }

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