/**
 * Solbros UI Framework
 * A dark-themed CSS framework extracted from Solbros Services
 *
 * Usage: Include this CSS file in your HTML
 * <link rel="stylesheet" href="solbros-ui.css">
 *
 * Also include Inter font:
 * <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet">
 */

/* ==========================================================================
   1. CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
  /* Primary Colors */
  --sb-primary: #e63946;
  --sb-primary-dark: #d62839;
  --sb-primary-light: #ff6b6b;
  --sb-primary-rgb: 230, 57, 70;

  /* Background Colors */
  --sb-bg-darkest: #0f172a;
  --sb-bg-dark: #1a1a2e;
  --sb-bg-medium: #16213e;
  --sb-bg-light: #1e293b;
  --sb-bg-lighter: #334155;

  /* Semantic Colors */
  --sb-success: #10b981;
  --sb-success-light: #34d399;
  --sb-success-dark: #059669;
  --sb-warning: #f59e0b;
  --sb-warning-light: #fbbf24;
  --sb-danger: #ef4444;
  --sb-danger-light: #f87171;
  --sb-info: #60a5fa;

  /* Text Colors */
  --sb-text-primary: #ffffff;
  --sb-text-secondary: rgba(255, 255, 255, 0.7);
  --sb-text-muted: rgba(255, 255, 255, 0.5);
  --sb-text-disabled: rgba(255, 255, 255, 0.3);

  /* Border Colors */
  --sb-border-light: rgba(255, 255, 255, 0.1);
  --sb-border-medium: rgba(255, 255, 255, 0.15);
  --sb-border-strong: rgba(255, 255, 255, 0.2);

  /* Surface Colors (semi-transparent whites for overlays) */
  --sb-surface-1: rgba(255, 255, 255, 0.03);
  --sb-surface-2: rgba(255, 255, 255, 0.05);
  --sb-surface-3: rgba(255, 255, 255, 0.08);
  --sb-surface-4: rgba(255, 255, 255, 0.1);
  --sb-surface-5: rgba(255, 255, 255, 0.15);

  /* Typography */
  --sb-font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --sb-font-size-xs: 11px;
  --sb-font-size-sm: 12px;
  --sb-font-size-base: 14px;
  --sb-font-size-md: 16px;
  --sb-font-size-lg: 18px;
  --sb-font-size-xl: 20px;
  --sb-font-size-2xl: 24px;
  --sb-font-size-3xl: 28px;
  --sb-font-size-4xl: 36px;

  --sb-font-weight-normal: 400;
  --sb-font-weight-medium: 500;
  --sb-font-weight-semibold: 600;
  --sb-font-weight-bold: 700;

  /* Spacing */
  --sb-spacing-xs: 4px;
  --sb-spacing-sm: 8px;
  --sb-spacing-md: 12px;
  --sb-spacing-lg: 16px;
  --sb-spacing-xl: 20px;
  --sb-spacing-2xl: 24px;
  --sb-spacing-3xl: 32px;
  --sb-spacing-4xl: 40px;

  /* Border Radius */
  --sb-radius-sm: 6px;
  --sb-radius-md: 10px;
  --sb-radius-lg: 12px;
  --sb-radius-xl: 16px;
  --sb-radius-2xl: 20px;
  --sb-radius-full: 9999px;

  /* Shadows */
  --sb-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --sb-shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --sb-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.3);
  --sb-shadow-xl: 0 25px 50px rgba(0, 0, 0, 0.4);
  --sb-shadow-primary: 0 4px 20px rgba(230, 57, 70, 0.4);

  /* Transitions */
  --sb-transition-fast: 0.15s ease;
  --sb-transition-base: 0.2s ease;
  --sb-transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --sb-transition-slow: 0.4s ease;

  /* Z-index layers */
  --sb-z-dropdown: 100;
  --sb-z-sticky: 200;
  --sb-z-modal-backdrop: 500;
  --sb-z-modal: 600;
  --sb-z-toast: 2000;
  --sb-z-loading: 9999;
}

/* ==========================================================================
   2. Base / Reset Styles
   ========================================================================== */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sb-font-family);
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-normal);
  line-height: 1.5;
  color: var(--sb-text-primary);
  background: linear-gradient(135deg, var(--sb-bg-dark) 0%, var(--sb-bg-medium) 50%, #0f3460 100%);
  min-height: 100vh;
}

/* Custom Scrollbars */
* {
  scrollbar-width: thin;
  scrollbar-color: rgba(var(--sb-primary-rgb), 0.5) var(--sb-surface-2);
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--sb-surface-2);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: rgba(var(--sb-primary-rgb), 0.5);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--sb-primary-rgb), 0.7);
}

/* ==========================================================================
   3. Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--sb-font-weight-bold);
  line-height: 1.2;
  color: var(--sb-text-primary);
}

h1 { font-size: var(--sb-font-size-4xl); }
h2 { font-size: var(--sb-font-size-3xl); }
h3 { font-size: var(--sb-font-size-2xl); }
h4 { font-size: var(--sb-font-size-xl); }
h5 { font-size: var(--sb-font-size-lg); }
h6 { font-size: var(--sb-font-size-md); }

p {
  color: var(--sb-text-secondary);
  line-height: 1.6;
}

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

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

.text-primary { color: var(--sb-text-primary); }
.text-secondary { color: var(--sb-text-secondary); }
.text-muted { color: var(--sb-text-muted); }
.text-success { color: var(--sb-success-light); }
.text-warning { color: var(--sb-warning-light); }
.text-danger { color: var(--sb-danger-light); }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* ==========================================================================
   4. Layout Components
   ========================================================================== */

/* Container */
.sb-container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--sb-spacing-2xl);
}

.sb-container-fluid {
  width: 100%;
  padding: 0 var(--sb-spacing-2xl);
}

/* Main Content Area */
.sb-main {
  padding: var(--sb-spacing-3xl);
  min-height: calc(100vh - 80px);
}

/* Grid System */
.sb-grid {
  display: grid;
  gap: var(--sb-spacing-2xl);
}

.sb-grid-2 { grid-template-columns: repeat(2, 1fr); }
.sb-grid-3 { grid-template-columns: repeat(3, 1fr); }
.sb-grid-4 { grid-template-columns: repeat(4, 1fr); }
.sb-grid-auto { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }

/* Flex Utilities */
.sb-flex { display: flex; }
.sb-flex-col { flex-direction: column; }
.sb-flex-wrap { flex-wrap: wrap; }
.sb-items-center { align-items: center; }
.sb-items-start { align-items: flex-start; }
.sb-items-end { align-items: flex-end; }
.sb-justify-center { justify-content: center; }
.sb-justify-between { justify-content: space-between; }
.sb-justify-end { justify-content: flex-end; }
.sb-gap-sm { gap: var(--sb-spacing-sm); }
.sb-gap-md { gap: var(--sb-spacing-md); }
.sb-gap-lg { gap: var(--sb-spacing-lg); }
.sb-gap-xl { gap: var(--sb-spacing-xl); }

/* ==========================================================================
   5. Header & Navigation
   ========================================================================== */

.sb-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sb-spacing-lg) var(--sb-spacing-3xl);
  background: linear-gradient(135deg, var(--sb-bg-light) 0%, var(--sb-bg-lighter) 100%);
  border-bottom: 1px solid var(--sb-border-light);
  position: sticky;
  top: 0;
  z-index: var(--sb-z-sticky);
  box-shadow: var(--sb-shadow-md);
}

.sb-header-brand {
  display: flex;
  align-items: center;
  gap: var(--sb-spacing-md);
}

.sb-header-brand img {
  height: 36px;
  width: auto;
}

.sb-header-brand h1 {
  font-size: var(--sb-font-size-xl);
  font-weight: var(--sb-font-weight-bold);
  color: var(--sb-text-primary);
}

.sb-header-nav {
  display: flex;
  align-items: center;
  gap: var(--sb-spacing-xs);
}

.sb-nav-link {
  padding: var(--sb-spacing-sm) var(--sb-spacing-lg);
  border-radius: var(--sb-radius-md);
  color: var(--sb-text-secondary);
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-medium);
  transition: all var(--sb-transition-smooth);
  text-decoration: none;
}

.sb-nav-link:hover {
  color: var(--sb-text-primary);
  background: var(--sb-surface-4);
}

.sb-nav-link.active {
  color: var(--sb-text-primary);
  background: rgba(var(--sb-primary-rgb), 0.3);
}

.sb-header-actions {
  display: flex;
  align-items: center;
  gap: var(--sb-spacing-lg);
}

.sb-user-info {
  color: var(--sb-text-secondary);
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-medium);
}

/* ==========================================================================
   6. Buttons
   ========================================================================== */

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

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

/* Primary Button */
.sb-btn-primary {
  background: linear-gradient(135deg, var(--sb-primary) 0%, var(--sb-primary-dark) 100%);
  color: var(--sb-text-primary);
  box-shadow: var(--sb-shadow-sm);
}

.sb-btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--sb-shadow-primary);
}

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

/* Secondary Button */
.sb-btn-secondary {
  background: var(--sb-surface-4);
  color: var(--sb-text-secondary);
  border: 1px solid var(--sb-border-medium);
}

.sb-btn-secondary:hover:not(:disabled) {
  background: var(--sb-surface-5);
  color: var(--sb-text-primary);
}

/* Ghost Button */
.sb-btn-ghost {
  background: transparent;
  color: var(--sb-text-secondary);
}

.sb-btn-ghost:hover:not(:disabled) {
  background: var(--sb-surface-3);
  color: var(--sb-text-primary);
}

/* Danger Button */
.sb-btn-danger {
  background: rgba(239, 68, 68, 0.2);
  color: var(--sb-danger-light);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.sb-btn-danger:hover:not(:disabled) {
  background: var(--sb-danger);
  color: var(--sb-text-primary);
}

/* Success Button */
.sb-btn-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--sb-success-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.sb-btn-success:hover:not(:disabled) {
  background: var(--sb-success);
  color: var(--sb-text-primary);
}

/* Logout Button */
.sb-btn-logout {
  background: rgba(var(--sb-primary-rgb), 0.2);
  color: var(--sb-primary-light);
  border: 1px solid rgba(var(--sb-primary-rgb), 0.3);
}

.sb-btn-logout:hover:not(:disabled) {
  background: var(--sb-primary);
  color: var(--sb-text-primary);
}

/* Button Sizes */
.sb-btn-sm {
  padding: var(--sb-spacing-sm) var(--sb-spacing-md);
  font-size: var(--sb-font-size-sm);
  border-radius: var(--sb-radius-sm);
}

.sb-btn-lg {
  padding: var(--sb-spacing-lg) var(--sb-spacing-2xl);
  font-size: var(--sb-font-size-md);
  border-radius: var(--sb-radius-lg);
}

/* Icon Button */
.sb-btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--sb-radius-md);
}

.sb-btn-icon.sb-btn-sm {
  width: 28px;
  height: 28px;
}

.sb-btn-icon.sb-btn-lg {
  width: 44px;
  height: 44px;
}

/* ==========================================================================
   7. Cards
   ========================================================================== */

.sb-card {
  background: var(--sb-surface-2);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-xl);
  padding: var(--sb-spacing-2xl);
  transition: all var(--sb-transition-smooth);
}

.sb-card:hover {
  border-color: var(--sb-border-medium);
  box-shadow: var(--sb-shadow-sm);
}

.sb-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sb-spacing-lg);
}

.sb-card-title {
  font-size: var(--sb-font-size-lg);
  font-weight: var(--sb-font-weight-semibold);
  color: var(--sb-text-primary);
}

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

.sb-card-footer {
  margin-top: var(--sb-spacing-lg);
  padding-top: var(--sb-spacing-lg);
  border-top: 1px solid var(--sb-border-light);
}

/* Clickable Card */
.sb-card-clickable {
  cursor: pointer;
}

.sb-card-clickable:hover {
  transform: translateY(-2px);
  border-color: var(--sb-primary);
}

/* Stat Card */
.sb-stat-card {
  text-align: center;
}

.sb-stat-value {
  font-size: var(--sb-font-size-3xl);
  font-weight: var(--sb-font-weight-bold);
  color: var(--sb-text-primary);
  margin-bottom: var(--sb-spacing-xs);
}

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

/* ==========================================================================
   8. Forms
   ========================================================================== */

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

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

.sb-form-label.required::after {
  content: ' *';
  color: var(--sb-primary);
}

.sb-form-input,
.sb-form-textarea,
.sb-form-select {
  width: 100%;
  padding: var(--sb-spacing-md) var(--sb-spacing-lg);
  background: var(--sb-surface-2);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-md);
  color: var(--sb-text-primary);
  font-family: var(--sb-font-family);
  font-size: var(--sb-font-size-base);
  transition: all var(--sb-transition-base);
}

.sb-form-input::placeholder,
.sb-form-textarea::placeholder {
  color: var(--sb-text-muted);
}

.sb-form-input:focus,
.sb-form-textarea:focus,
.sb-form-select:focus {
  outline: none;
  border-color: var(--sb-primary);
  background: var(--sb-surface-3);
  box-shadow: 0 0 0 4px rgba(var(--sb-primary-rgb), 0.2);
}

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

.sb-form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='rgba(255,255,255,0.5)'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}

.sb-form-select option {
  background: var(--sb-bg-light);
  color: var(--sb-text-primary);
}

/* Form Row (2 columns) */
.sb-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sb-spacing-lg);
}

/* Checkbox & Radio */
.sb-form-check {
  display: flex;
  align-items: center;
  gap: var(--sb-spacing-sm);
  cursor: pointer;
}

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

/* Input with Icon */
.sb-input-icon-wrapper {
  position: relative;
}

.sb-input-icon {
  position: absolute;
  left: var(--sb-spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--sb-text-muted);
  pointer-events: none;
}

.sb-input-icon-wrapper .sb-form-input {
  padding-left: 44px;
}

/* ==========================================================================
   9. Modals
   ========================================================================== */

.sb-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--sb-z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--sb-transition-smooth);
  padding: var(--sb-spacing-2xl);
}

.sb-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.sb-modal {
  background: linear-gradient(180deg, var(--sb-bg-light) 0%, var(--sb-bg-dark) 100%);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--sb-transition-smooth);
}

.sb-modal-overlay.active .sb-modal {
  transform: scale(1) translateY(0);
}

.sb-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sb-spacing-2xl);
  border-bottom: 1px solid var(--sb-border-light);
}

.sb-modal-title {
  font-size: var(--sb-font-size-xl);
  font-weight: var(--sb-font-weight-semibold);
  color: var(--sb-text-primary);
}

.sb-modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--sb-text-muted);
  font-size: 24px;
  cursor: pointer;
  border-radius: var(--sb-radius-sm);
  transition: all var(--sb-transition-base);
}

.sb-modal-close:hover {
  background: var(--sb-surface-4);
  color: var(--sb-text-primary);
}

.sb-modal-body {
  padding: var(--sb-spacing-2xl);
}

.sb-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--sb-spacing-md);
  padding: var(--sb-spacing-lg) var(--sb-spacing-2xl);
  border-top: 1px solid var(--sb-border-light);
  background: var(--sb-surface-1);
}

/* Modal Sizes */
.sb-modal-sm { max-width: 400px; }
.sb-modal-lg { max-width: 800px; }
.sb-modal-xl { max-width: 1000px; }

/* ==========================================================================
   10. Tables
   ========================================================================== */

.sb-table-wrapper {
  width: 100%;
  background: var(--sb-surface-2);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-xl);
  overflow: hidden;
}

.sb-table {
  width: 100%;
  border-collapse: collapse;
}

.sb-table th {
  background: var(--sb-surface-2);
  color: var(--sb-text-secondary);
  font-size: var(--sb-font-size-sm);
  font-weight: var(--sb-font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: var(--sb-spacing-lg) var(--sb-spacing-xl);
  text-align: left;
}

.sb-table td {
  color: var(--sb-text-primary);
  font-size: var(--sb-font-size-base);
  padding: var(--sb-spacing-lg) var(--sb-spacing-xl);
  border-top: 1px solid var(--sb-border-light);
}

.sb-table tr:hover td {
  background: var(--sb-surface-1);
}

.sb-table .text-right {
  text-align: right;
}

/* ==========================================================================
   11. Badges & Tags
   ========================================================================== */

.sb-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--sb-spacing-xs) var(--sb-spacing-md);
  border-radius: var(--sb-radius-full);
  font-size: var(--sb-font-size-xs);
  font-weight: var(--sb-font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sb-badge-primary {
  background: rgba(var(--sb-primary-rgb), 0.2);
  color: var(--sb-primary-light);
}

.sb-badge-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--sb-success-light);
}

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

.sb-badge-danger {
  background: rgba(239, 68, 68, 0.2);
  color: var(--sb-danger-light);
}

.sb-badge-info {
  background: rgba(96, 165, 250, 0.2);
  color: var(--sb-info);
}

.sb-badge-neutral {
  background: var(--sb-surface-4);
  color: var(--sb-text-secondary);
}

/* ==========================================================================
   12. Progress Bars
   ========================================================================== */

.sb-progress {
  width: 100%;
  height: 8px;
  background: var(--sb-surface-4);
  border-radius: var(--sb-radius-full);
  overflow: hidden;
}

.sb-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--sb-success), var(--sb-success-light));
  border-radius: var(--sb-radius-full);
  transition: width var(--sb-transition-smooth);
}

.sb-progress-bar.warning {
  background: linear-gradient(90deg, var(--sb-warning), var(--sb-warning-light));
}

.sb-progress-bar.danger {
  background: linear-gradient(90deg, var(--sb-danger), var(--sb-danger-light));
}

.sb-progress-bar.primary {
  background: linear-gradient(90deg, var(--sb-primary), var(--sb-primary-light));
}

/* Slim Progress */
.sb-progress-slim {
  height: 4px;
}

/* ==========================================================================
   13. Avatars
   ========================================================================== */

.sb-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--sb-primary), var(--sb-primary-dark));
  color: var(--sb-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--sb-font-size-sm);
  font-weight: var(--sb-font-weight-semibold);
  flex-shrink: 0;
}

.sb-avatar-sm {
  width: 32px;
  height: 32px;
  font-size: var(--sb-font-size-xs);
}

.sb-avatar-lg {
  width: 56px;
  height: 56px;
  font-size: var(--sb-font-size-lg);
}

.sb-avatar-xl {
  width: 80px;
  height: 80px;
  font-size: var(--sb-font-size-2xl);
}

/* Avatar Group */
.sb-avatar-group {
  display: flex;
}

.sb-avatar-group .sb-avatar {
  margin-left: -8px;
  border: 2px solid var(--sb-bg-dark);
}

.sb-avatar-group .sb-avatar:first-child {
  margin-left: 0;
}

/* ==========================================================================
   14. Toast Notifications
   ========================================================================== */

.sb-toast {
  position: fixed;
  bottom: var(--sb-spacing-2xl);
  right: var(--sb-spacing-2xl);
  background: var(--sb-bg-light);
  border: 1px solid var(--sb-border-light);
  padding: var(--sb-spacing-lg) var(--sb-spacing-2xl);
  border-radius: var(--sb-radius-lg);
  color: var(--sb-text-primary);
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-medium);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--sb-transition-smooth);
  z-index: var(--sb-z-toast);
  max-width: 400px;
}

.sb-toast.show {
  transform: translateY(0);
  opacity: 1;
}

.sb-toast.success {
  border-left: 4px solid var(--sb-success);
}

.sb-toast.error {
  border-left: 4px solid var(--sb-danger);
}

.sb-toast.warning {
  border-left: 4px solid var(--sb-warning);
}

.sb-toast.info {
  border-left: 4px solid var(--sb-info);
}

/* ==========================================================================
   15. Loading States
   ========================================================================== */

.sb-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--sb-bg-dark) 0%, var(--sb-bg-medium) 50%, #0f3460 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sb-spacing-2xl);
  z-index: var(--sb-z-loading);
  transition: opacity var(--sb-transition-slow), visibility var(--sb-transition-slow);
}

.sb-loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
}

.sb-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--sb-surface-5);
  border-top-color: var(--sb-primary);
  border-radius: 50%;
  animation: sb-spin 0.8s linear infinite;
}

.sb-spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

.sb-spinner-lg {
  width: 60px;
  height: 60px;
  border-width: 4px;
}

/* ==========================================================================
   16. Empty States
   ========================================================================== */

.sb-empty-state {
  text-align: center;
  padding: var(--sb-spacing-4xl) var(--sb-spacing-xl);
  color: var(--sb-text-muted);
}

.sb-empty-state-icon {
  font-size: 64px;
  margin-bottom: var(--sb-spacing-lg);
}

.sb-empty-state-title {
  font-size: var(--sb-font-size-lg);
  font-weight: var(--sb-font-weight-semibold);
  color: var(--sb-text-secondary);
  margin-bottom: var(--sb-spacing-sm);
}

.sb-empty-state-text {
  font-size: var(--sb-font-size-base);
  color: var(--sb-text-muted);
  max-width: 400px;
  margin: 0 auto;
}

/* ==========================================================================
   17. Lists
   ========================================================================== */

.sb-list {
  display: flex;
  flex-direction: column;
  gap: var(--sb-spacing-sm);
}

.sb-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sb-spacing-md) var(--sb-spacing-lg);
  background: var(--sb-surface-2);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-md);
  transition: all var(--sb-transition-base);
}

.sb-list-item:hover {
  background: var(--sb-surface-3);
  border-color: var(--sb-border-medium);
}

.sb-list-item-clickable {
  cursor: pointer;
}

.sb-list-item-clickable:hover {
  border-color: var(--sb-primary);
}

/* ==========================================================================
   18. Tabs
   ========================================================================== */

.sb-tabs {
  display: flex;
  gap: var(--sb-spacing-xs);
  margin-bottom: var(--sb-spacing-2xl);
  border-bottom: 1px solid var(--sb-border-light);
  padding-bottom: var(--sb-spacing-sm);
}

.sb-tab {
  padding: var(--sb-spacing-md) var(--sb-spacing-lg);
  background: transparent;
  border: none;
  border-radius: var(--sb-radius-md) var(--sb-radius-md) 0 0;
  color: var(--sb-text-secondary);
  font-family: var(--sb-font-family);
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-medium);
  cursor: pointer;
  transition: all var(--sb-transition-base);
}

.sb-tab:hover {
  color: var(--sb-text-primary);
  background: var(--sb-surface-3);
}

.sb-tab.active {
  color: var(--sb-primary);
  background: rgba(var(--sb-primary-rgb), 0.1);
  border-bottom: 2px solid var(--sb-primary);
}

/* ==========================================================================
   19. Dropdown
   ========================================================================== */

.sb-dropdown {
  position: relative;
  display: inline-block;
}

.sb-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: var(--sb-bg-light);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-lg);
  box-shadow: var(--sb-shadow-lg);
  padding: var(--sb-spacing-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--sb-transition-smooth);
  z-index: var(--sb-z-dropdown);
}

.sb-dropdown.open .sb-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.sb-dropdown-item {
  display: block;
  width: 100%;
  padding: var(--sb-spacing-md) var(--sb-spacing-lg);
  background: transparent;
  border: none;
  border-radius: var(--sb-radius-sm);
  color: var(--sb-text-secondary);
  font-family: var(--sb-font-family);
  font-size: var(--sb-font-size-base);
  text-align: left;
  cursor: pointer;
  transition: all var(--sb-transition-base);
}

.sb-dropdown-item:hover {
  background: var(--sb-surface-3);
  color: var(--sb-text-primary);
}

.sb-dropdown-divider {
  height: 1px;
  background: var(--sb-border-light);
  margin: var(--sb-spacing-sm) 0;
}

/* ==========================================================================
   20. Kanban Board
   ========================================================================== */

.sb-kanban {
  display: flex;
  gap: var(--sb-spacing-xl);
  padding: var(--sb-spacing-xl);
  overflow-x: auto;
  min-height: calc(100vh - 200px);
}

.sb-kanban-column {
  min-width: 320px;
  max-width: 320px;
  background: var(--sb-surface-2);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-xl);
  display: flex;
  flex-direction: column;
}

.sb-kanban-column.drag-over {
  border-color: var(--sb-primary);
  box-shadow: 0 0 0 2px rgba(var(--sb-primary-rgb), 0.3);
}

.sb-kanban-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--sb-spacing-lg);
  border-bottom: 1px solid var(--sb-border-light);
}

.sb-kanban-column-title {
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-semibold);
  color: var(--sb-text-primary);
}

.sb-kanban-task-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 24px;
  padding: 0 var(--sb-spacing-sm);
  background: var(--sb-surface-4);
  border-radius: var(--sb-radius-full);
  font-size: var(--sb-font-size-sm);
  font-weight: var(--sb-font-weight-medium);
  color: var(--sb-text-secondary);
  margin-left: var(--sb-spacing-sm);
}

.sb-kanban-column-tasks {
  flex: 1;
  padding: var(--sb-spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--sb-spacing-md);
  overflow-y: auto;
  min-height: 200px;
}

.sb-kanban-task {
  background: var(--sb-surface-3);
  border: 1px solid var(--sb-border-light);
  border-radius: var(--sb-radius-md);
  padding: var(--sb-spacing-md);
  cursor: grab;
  transition: all var(--sb-transition-base);
}

.sb-kanban-task:hover {
  border-color: var(--sb-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--sb-shadow-sm);
}

.sb-kanban-task.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.sb-kanban-task-title {
  font-size: var(--sb-font-size-base);
  font-weight: var(--sb-font-weight-medium);
  color: var(--sb-text-primary);
  margin-bottom: var(--sb-spacing-sm);
}

.sb-kanban-task-meta {
  display: flex;
  align-items: center;
  gap: var(--sb-spacing-md);
  font-size: var(--sb-font-size-sm);
  color: var(--sb-text-muted);
}

.sb-kanban-add-task {
  width: 100%;
  padding: var(--sb-spacing-md);
  background: transparent;
  border: 1px dashed var(--sb-border-medium);
  border-radius: var(--sb-radius-md);
  color: var(--sb-text-muted);
  font-family: var(--sb-font-family);
  font-size: var(--sb-font-size-base);
  cursor: pointer;
  transition: all var(--sb-transition-base);
  margin: var(--sb-spacing-md);
}

.sb-kanban-add-task:hover {
  background: var(--sb-surface-3);
  border-color: var(--sb-primary);
  color: var(--sb-text-primary);
}

/* ==========================================================================
   21. Animations
   ========================================================================== */

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

@keyframes sb-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sb-slide-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sb-slide-down {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sb-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes sb-float {
  0% {
    transform: translateY(0) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0;
  }
}

/* Animation Utilities */
.sb-animate-fade-in {
  animation: sb-fade-in 0.3s ease-out;
}

.sb-animate-slide-up {
  animation: sb-slide-up 0.4s ease-out;
}

.sb-animate-slide-down {
  animation: sb-slide-down 0.3s ease-out;
}

.sb-animate-pulse {
  animation: sb-pulse 2s ease-in-out infinite;
}

/* ==========================================================================
   22. Utility Classes
   ========================================================================== */

/* Display */
.sb-hidden { display: none !important; }
.sb-block { display: block; }
.sb-inline { display: inline; }
.sb-inline-block { display: inline-block; }

/* Spacing */
.sb-m-0 { margin: 0; }
.sb-mt-sm { margin-top: var(--sb-spacing-sm); }
.sb-mt-md { margin-top: var(--sb-spacing-md); }
.sb-mt-lg { margin-top: var(--sb-spacing-lg); }
.sb-mt-xl { margin-top: var(--sb-spacing-xl); }
.sb-mb-sm { margin-bottom: var(--sb-spacing-sm); }
.sb-mb-md { margin-bottom: var(--sb-spacing-md); }
.sb-mb-lg { margin-bottom: var(--sb-spacing-lg); }
.sb-mb-xl { margin-bottom: var(--sb-spacing-xl); }

.sb-p-0 { padding: 0; }
.sb-p-sm { padding: var(--sb-spacing-sm); }
.sb-p-md { padding: var(--sb-spacing-md); }
.sb-p-lg { padding: var(--sb-spacing-lg); }
.sb-p-xl { padding: var(--sb-spacing-xl); }

/* Width */
.sb-w-full { width: 100%; }
.sb-w-auto { width: auto; }

/* Border Radius */
.sb-rounded { border-radius: var(--sb-radius-md); }
.sb-rounded-lg { border-radius: var(--sb-radius-lg); }
.sb-rounded-full { border-radius: var(--sb-radius-full); }

/* Shadows */
.sb-shadow { box-shadow: var(--sb-shadow-md); }
.sb-shadow-lg { box-shadow: var(--sb-shadow-lg); }

/* Overflow */
.sb-overflow-hidden { overflow: hidden; }
.sb-overflow-auto { overflow: auto; }

/* Cursor */
.sb-cursor-pointer { cursor: pointer; }

/* ==========================================================================
   23. Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
  .sb-grid-2,
  .sb-grid-3,
  .sb-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .sb-header {
    padding: var(--sb-spacing-md) var(--sb-spacing-lg);
  }

  .sb-header-nav {
    display: none;
  }
}

@media (max-width: 768px) {
  .sb-grid-2,
  .sb-grid-3,
  .sb-grid-4 {
    grid-template-columns: 1fr;
  }

  .sb-form-row {
    grid-template-columns: 1fr;
  }

  .sb-main {
    padding: var(--sb-spacing-lg);
  }

  .sb-modal {
    margin: var(--sb-spacing-md);
    max-height: calc(100vh - 32px);
  }

  .sb-kanban {
    padding: var(--sb-spacing-md);
  }

  .sb-kanban-column {
    min-width: 280px;
    max-width: 280px;
  }
}

@media (max-width: 480px) {
  .sb-header-brand h1 {
    font-size: var(--sb-font-size-md);
  }

  .sb-btn {
    padding: var(--sb-spacing-sm) var(--sb-spacing-md);
  }

  .sb-card {
    padding: var(--sb-spacing-lg);
  }
}