/* =============================================
   AX교육플랫폼 - Sidebar / Dashboard Layout CSS
   Charlie / 3분대장 - Task #8
   ============================================= */

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

/* === Sidebar === */
.sidebar {
  width: 220px;
  background: var(--color-primary);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--transition);
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.2) transparent;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

.sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.2);
  border-radius: 2px;
}

/* Collapsed state */
.sidebar.collapsed {
  width: 64px;
}

.sidebar.collapsed .sidebar-label,
.sidebar.collapsed .sidebar-section-title,
.sidebar.collapsed .sidebar-logo-text {
  display: none;
}

.sidebar.collapsed .sidebar-item a {
  justify-content: center;
  padding: 14px;
}

/* === Sidebar Header / Logo === */
.sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.sidebar-logo img {
  height: 36px;
  width: auto;
  display: block;
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
  color: white;
  flex-shrink: 0;
}

.sidebar-logo-text {
  color: white;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.2;
}

.sidebar-logo-text small {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  opacity: 0.6;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: rgba(255,255,255,0.95);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition);
  font-size: 1.1rem;
}

.sidebar-toggle:hover {
  color: white;
}

/* === Sidebar User Profile === */
.sidebar-user {
  padding: 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: white;
  flex-shrink: 0;
}

.sidebar-user-info {
  overflow: hidden;
}

.sidebar-user-name {
  color: white;
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  color: rgba(255,255,255,0.95);
  font-size: 0.75rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* === Sidebar Navigation === */
.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.sidebar-section-title {
  padding: 12px 16px 6px;
  font-size: 0.7rem;
  font-weight: 700;
  color: rgba(255,255,255,0.35);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.sidebar-menu {
  list-style: none;
  padding: 0;
}

.sidebar-item {
  position: relative;
}

.sidebar-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px 11px 20px;
  color: rgba(255,255,255,0.95);
  text-decoration: none;
  transition: all var(--transition);
  border-left: 3px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
}

.sidebar-item a:hover {
  color: white;
  background: rgba(255,255,255,0.08);
  border-left-color: rgba(255,255,255,0.3);
}

.sidebar-item.active a {
  color: white;
  background: rgba(255,107,53,0.15);
  border-left-color: var(--color-accent);
  font-weight: 600;
}

.sidebar-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.sidebar-label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Sidebar Badge (notification count) */
.sidebar-badge {
  background: var(--color-accent);
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 999px;
  min-width: 18px;
  text-align: center;
  line-height: 1.6;
}

/* Sidebar Submenu */
.sidebar-submenu {
  list-style: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.sidebar-item.open > .sidebar-submenu {
  max-height: 300px;
}

.sidebar-submenu a {
  padding-left: 48px;
  font-size: 0.85rem;
}

.sidebar-submenu-arrow {
  font-size: 0.75rem;
  transition: transform var(--transition);
}

.sidebar-item.open .sidebar-submenu-arrow {
  transform: rotate(90deg);
}

/* === Sidebar Footer === */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
  flex-shrink: 0;
}

.sidebar-footer-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 12px;
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  color: rgba(255,255,255,0.95);
  cursor: pointer;
  font-size: 0.875rem;
  font-family: var(--font-korean);
  transition: all var(--transition);
  text-decoration: none;
  margin-bottom: 6px;
}

.sidebar-footer-btn:hover {
  background: rgba(255,255,255,0.08);
  color: white;
  border-color: rgba(255,255,255,0.3);
}

.sidebar-footer-btn:last-child {
  margin-bottom: 0;
}

/* === Main Content Area === */
.app-main {
  flex: 1;
  background: var(--color-bg);
  overflow-y: auto;
  min-width: 0; /* prevent flex overflow */
}

/* Dashboard Header */
.app-header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--space-xl);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.app-header-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
}

.app-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.app-breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.app-breadcrumb a:hover {
  color: var(--color-accent);
}

.app-breadcrumb-sep {
  color: var(--color-border);
}

.app-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* Notification Bell */
.notif-btn {
  position: relative;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: all var(--transition);
}

.notif-btn:hover {
  border-color: var(--color-accent);
}

.notif-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  border: 2px solid white;
}

/* === Dashboard Content Padding === */
.app-content {
  padding: var(--space-xl);
}

.app-content-header {
  margin-bottom: var(--space-xl);
}

.app-content-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.app-content-subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* === Dashboard Grid Layouts === */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.dashboard-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.dashboard-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

/* === Widget Cards (Dashboard) === */
.widget {
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
}

.widget-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.widget-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-primary);
}

.widget-action {
  font-size: 0.8rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.widget-action:hover {
  text-decoration: underline;
}

/* Stat Widget */
.stat-widget {
  background: var(--color-white);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  transition: box-shadow var(--transition);
}

.stat-widget:hover {
  box-shadow: var(--shadow-md);
}

.stat-widget-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.stat-widget-icon-primary { background: rgba(45,27,105,0.08); }
.stat-widget-icon-accent { background: rgba(255,107,53,0.1); }
.stat-widget-icon-green { background: rgba(0,200,150,0.1); }
.stat-widget-icon-blue { background: rgba(59,130,246,0.1); }
.stat-widget-icon-purple { background: rgba(139,92,246,0.1); }

.stat-widget-content { flex: 1; }
.stat-widget-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.2;
}
.stat-widget-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}
.stat-widget-change {
  font-size: 0.8rem;
  font-weight: 600;
  margin-top: var(--space-xs);
}
.stat-widget-change.up { color: var(--color-green); }
.stat-widget-change.down { color: #EF4444; }

/* === Course Progress Widget === */
.course-progress-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.course-progress-item:last-child {
  border-bottom: none;
}

.course-progress-info {
  flex: 1;
  min-width: 0;
}

.course-progress-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.course-progress-bar-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.course-progress-bar-wrap .progress-bar {
  flex: 1;
  height: 6px;
}

.course-progress-pct {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  width: 32px;
  text-align: right;
}

/* === Activity Feed === */
.activity-item {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.activity-item:last-child { border-bottom: none; }

.activity-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255,107,53,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.activity-content { flex: 1; }
.activity-text {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.4;
}
.activity-time {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* === Sidebar Mobile Overlay === */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 990;
}

.sidebar-overlay.active {
  display: block;
}

/* Mobile Sidebar Toggle Button */
.sidebar-mobile-toggle {
  display: none;
  position: fixed;
  bottom: 80px;
  left: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  z-index: 500;
  box-shadow: var(--shadow-lg);
  align-items: center;
  justify-content: center;
}

/* === Responsive - Tablet === */
@media (max-width: 1024px) {
  .sidebar { width: 200px; }
  .dashboard-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-row { grid-template-columns: 1fr; }
  .dashboard-row-3 { grid-template-columns: repeat(2, 1fr); }
}

/* === Responsive - Mobile === */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -220px;
    z-index: 995;
    height: 100vh;
    top: 0;
    transition: left var(--transition);
    width: 220px;
  }

  .sidebar.mobile-open {
    left: 0;
  }

  .sidebar-overlay.active {
    display: block;
  }

  .sidebar-mobile-toggle {
    display: flex;
  }

  .app-main {
    margin-left: 0;
  }

  .app-content {
    padding: var(--space-md);
  }

  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .dashboard-row,
  .dashboard-row-3 {
    grid-template-columns: 1fr;
  }

  .app-header {
    padding: 0 var(--space-md);
  }
}

/* === Responsive - Small Mobile === */
@media (max-width: 480px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .app-header-title { font-size: 0.95rem; }
  .app-content-title { font-size: 1.25rem; }
}