/* ==========================================================================
   LAYOUT STYLES
   ========================================================================== */

/* ==========================================================================
   APPLICATION LAYOUT
   ========================================================================== */

.app-container {
  display: flex;
  height: 100vh;
  background-color: var(--color-bg-primary);
}

/* View system */
.view {
  display: none;
  height: 100%;
}

.view.active {
  display: block;
}

/* ==========================================================================
   SIDEBAR
   ========================================================================== */

.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background: linear-gradient(180deg, var(--color-surface-elevated) 0%, var(--color-gray-50) 100%);
  border-right: var(--border-width-thin) solid var(--color-border-light);
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--z-fixed);
  backdrop-filter: blur(10px);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-8);
  border-bottom: var(--border-width-thin) solid var(--color-border-light);
  padding-bottom: var(--space-4);
}

.logo svg {
  width: 48px;
  height: 48px;
  margin-left: var(--space-4);
  color: var(--color-gray-button);
}

.logo h1 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

/* Navigation */
.sidebar-nav {
  flex-grow: 1;
  padding: var(--space-2) 0;
}

/* Navigation Sections */
.nav-section {
  margin-bottom: var(--space-6);
}

.nav-section:last-child {
  margin-bottom: 0;
}

.nav-section:first-child {
  margin-top: var(--space-2);
}

.nav-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-2) var(--space-4) var(--space-3) var(--space-4);
  margin-bottom: var(--space-1);
  opacity: 0.8;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-4);
  margin-bottom: var(--space-1);
  border-radius: var(--border-radius-lg);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  position: relative;
}

.nav-item:hover {
  background: var(--color-gray-100);
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-item.active {
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

.nav-icon {
  margin-right: var(--space-4);
  font-size: var(--font-size-lg);
  width: 20px;
  text-align: center;
  transition: color 0.2s ease;
}

/* Subtle count number for nav items */
.nav-item .nav-count,
.nav-item .favorites-count {
  margin-left: auto;
  color: var(--color-text-tertiary);
  font-size: 11px;
  line-height: 1;
  padding: 0;
}

/* User Info */
.user-info {
  padding-top: var(--space-4);
  border-top: var(--border-width-thin) solid var(--color-border-light);
}

.user-info-header {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-3);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  overflow: hidden;
  margin-right: var(--space-3);
  border: 2px solid var(--color-border-light);
  transition: var(--transition-base);
}

.user-avatar:hover {
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-email {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.02em;
  line-height: var(--line-height-tight);
}

/* Logout Button */
.logout-btn {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border-radius: var(--border-radius-base);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: left;
  gap: var(--space-2);
}

.logout-btn:hover {
  background: var(--color-error-light);
  border-color: var(--color-error);
  color: var(--color-error);
  transform: translateY(-1px);
}

.logout-btn i {
  font-size: var(--font-size-xs);
}

/* ==========================================================================
   MAIN CONTENT
   ========================================================================== */

.main-content {
  flex: 1;
  padding: var(--space-12);
  margin-left: var(--sidebar-width);
  overflow-y: auto;
  height: 100vh;
}

/* Content Header */
.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-2);
}

.content-header h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0;
}

/* Header Actions */
.header-actions {
  display: flex;
  gap: var(--space-2);
}

/* ==========================================================================
   TABS
   ========================================================================== */

.tabs {
  display: flex;
  border-bottom: var(--border-width-medium) solid var(--color-border-light);
  margin-bottom: var(--space-5);
}

.tab-btn {
  padding: var(--space-2) var(--space-4);
  font-weight: var(--font-weight-medium);
  position: relative;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-all);
}

.tab-btn:hover {
  color: var(--color-primary);
}

.tab-btn.active {
  color: var(--color-primary);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: calc(-1 * var(--border-width-medium));
  left: 0;
  width: 100%;
  height: var(--border-width-medium);
  background-color: var(--color-primary);
}

/* Tab Content */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ==========================================================================
   FILTER CONTROLS
   ========================================================================== */

.filter-controls {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  align-items: center;
  flex-wrap: wrap;
}

.filter-controls .search-container {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.filter-controls .search-container i {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.filter-container {
  min-width: 200px;
}

.filter-select,
.sort-select,
.date-range-select {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border: var(--border-width-thin) solid var(--color-border-medium);
  border-radius: var(--border-radius-base);
  font-size: var(--font-size-sm);
  background: var(--color-surface-elevated);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2371717a' d='M6 8.825L1.175 4 2.05 3.125 6 7.075 9.95 3.125 10.825 4z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  transition: var(--transition-all);
}

.filter-select:focus,
.sort-select:focus,
.date-range-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ==========================================================================
   GRID LAYOUTS
   ========================================================================== */

.channels-grid,
.outliers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

/* ==========================================================================
   LOADING & ERROR STATES
   ========================================================================== */

.loading,
.no-data,
.error {
  padding: var(--space-5);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.loading i,
.no-data i,
.error i {
  font-size: var(--font-size-lg);
}

.error {
  color: var(--color-error);
}

/* Simple centered empty states */
.favorites-empty-state,
.channels-empty-state,
.outliers-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-8);
  background: transparent;
  width: 100%;
  box-sizing: border-box;
  grid-column: 1 / -1;
  min-height: 300px;
}


.favorites-empty-state .empty-content,
.channels-empty-state .empty-content,
.outliers-empty-state .empty-content {
  margin-bottom: var(--space-6);
}

.favorites-empty-state .empty-title,
.channels-empty-state .empty-title,
.outliers-empty-state .empty-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin: 0 0 var(--space-3) 0;
  letter-spacing: -0.01em;
}

.favorites-empty-state .empty-subtitle,
.channels-empty-state .empty-subtitle,
.outliers-empty-state .empty-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.4;
}

.favorites-empty-state .empty-actions,
.channels-empty-state .empty-actions,
.outliers-empty-state .empty-actions {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.favorites-empty-state .btn,
.channels-empty-state .btn,
.outliers-empty-state .btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--border-radius-base);
  transition: all 0.15s ease;
  min-width: 100px;
}

.favorites-empty-state .btn-primary,
.channels-empty-state .btn-primary,
.outliers-empty-state .btn-primary {
  background: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
}

.favorites-empty-state .btn-primary:hover,
.channels-empty-state .btn-primary:hover,
.outliers-empty-state .btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.favorites-empty-state .btn-secondary,
.channels-empty-state .btn-secondary,
.outliers-empty-state .btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.favorites-empty-state .btn-secondary:hover,
.channels-empty-state .btn-secondary:hover,
.outliers-empty-state .btn-secondary:hover {
  background: var(--color-surface-elevated);
  border-color: var(--color-border-hover);
}

@media (max-width: 768px) {
  .favorites-empty-state,
  .channels-empty-state,
  .outliers-empty-state {
    padding: var(--space-8) var(--space-4);
    min-height: 250px;
  }
  
  .favorites-empty-state .empty-title,
  .channels-empty-state .empty-title,
  .outliers-empty-state .empty-title {
    font-size: var(--font-size-lg);
  }
  
  .favorites-empty-state .empty-subtitle,
  .channels-empty-state .empty-subtitle,
  .outliers-empty-state .empty-subtitle {
    font-size: var(--font-size-sm);
  }
  
  .favorites-empty-state .empty-actions,
  .channels-empty-state .empty-actions,
  .outliers-empty-state .empty-actions {
    flex-direction: column;
    gap: var(--space-2);
    width: 100%;
    max-width: 200px;
  }
  
  .favorites-empty-state .btn,
  .channels-empty-state .btn,
  .outliers-empty-state .btn {
    width: 100%;
    padding: var(--space-2) var(--space-3);
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

/* Tablet and below */
@media (max-width: 768px) {
  .sidebar {
    width: var(--sidebar-width-collapsed);
    padding: var(--space-3);
    background: var(--color-surface-elevated);
  }

  .logo {
    padding: var(--space-2);
    margin-bottom: var(--space-6);
  }

  .logo h1,
  .nav-item span:not(.nav-icon),
  .nav-section-title,
  .user-email,
  .logout-btn span {
    display: none;
  }

  .nav-item {
    padding: var(--space-3);
    justify-content: center;
  }

  .nav-icon {
    margin-right: 0;
  }

  .user-info {
    padding: var(--space-2);
  }

  .logout-btn {
    padding: var(--space-2);
  }

  .logout-btn i {
    margin: 0;
  }

  .main-content {
    margin-left: var(--sidebar-width-collapsed);
  }

  .content-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
  }

  .filter-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-controls .search-container {
    max-width: none;
  }

  .filter-container {
    min-width: 0;
  }

  .channels-grid,
  .outliers-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-4);
  }
}

/* Mobile */
@media (max-width: 480px) {
  .main-content {
    padding: var(--space-4);
  }

  .content-header h2 {
    font-size: var(--font-size-xl);
  }

  .channels-grid,
  .outliers-grid {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .filter-controls {
    gap: var(--space-3);
  }

  .tabs {
    margin-bottom: var(--space-4);
  }

  .tab-btn {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
  }
}