/*
 * NextLevel - Layout System
 */

/* ============================================
   APP SHELL
   The primary layout container
   ============================================ */

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  background: var(--canvas-deep);
}

/* ============================================
   SIDEBAR
   Navigation & Brand Identity
   ============================================ */

.sidebar {
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--canvas-base);
  border-right: 1px solid var(--border-subtle);
  overflow: hidden;
}

/* Brand header */
.sidebar-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--border-subtle);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-primary);
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-inverse);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  padding: var(--space-4);
  overflow-y: auto;
}

.nav-section {
  margin-bottom: var(--space-6);
}

.nav-section-title {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-2);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.nav-item:hover {
  background: var(--surface-secondary);
  color: var(--text-primary);
}

.nav-item.active {
  background: var(--accent-primary-muted);
  color: var(--accent-primary);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  opacity: 0.7;
}

.nav-item.active svg,
.nav-item:hover svg {
  opacity: 1;
}

/* Connection status in sidebar */
.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-secondary);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.connection-status .status-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--semantic-success);
}

.connection-status.disconnected .status-dot {
  background: var(--text-tertiary);
}

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

.main {
  display: grid;
  grid-template-columns: 1fr 360px;
  height: 100vh;
  overflow: hidden;
}

/* Toggle for right panel on smaller screens */
.main.panel-collapsed {
  grid-template-columns: 1fr;
}

.main.panel-collapsed .right-panel {
  display: none;
}

/* ============================================
   CHAT AREA (CENTER)
   ============================================ */

.chat-area {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--canvas-deep);
  position: relative;
  overflow: hidden;
}



.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: rgba(13, 13, 15, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  z-index: 10;
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.chat-header-title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--text-primary);
}

.chat-header-subtitle {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.chat-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Messages area */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* Empty state */
.chat-empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
}

.chat-empty-icon {
  width: 80px;
  height: 80px;
  margin-bottom: var(--space-6);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-secondary);
  border-radius: var(--radius-2xl);
  color: var(--text-tertiary);
}

.chat-empty-icon svg {
  width: 40px;
  height: 40px;
}

.chat-empty-title {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.chat-empty-description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  max-width: 400px;
  line-height: var(--leading-relaxed);
}

/* Chat input area */
.chat-input-area {
  padding: var(--space-4) var(--space-6) var(--space-6);
  background: var(--canvas-deep);
  border-top: 1px solid var(--border-subtle);
}

.chat-input-container {
  display: flex;
  align-items: flex-end;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--surface-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-2xl);
  transition: all var(--duration-fast) var(--ease-out);
}

.chat-input-container:focus-within {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-primary-muted), var(--shadow-lg);
}

.chat-input {
  flex: 1;
  min-height: 24px;
  max-height: 200px;
  padding: var(--space-2) var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
  resize: none;
  line-height: var(--leading-normal);
}

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

.chat-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--accent-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  flex-shrink: 0;
}

.chat-submit:hover {
  background: var(--accent-primary-hover);
  transform: scale(1.02);
}

.chat-submit:active {
  transform: scale(0.98);
}

.chat-submit svg {
  width: 22px;
  height: 22px;
}

/* ============================================
   RIGHT PANEL - Learning Progress
   ============================================ */

.right-panel {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--canvas-base);
  border-left: 1px solid var(--border-subtle);
  overflow: hidden;
}

.right-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
}

/* New task button with pulse animation */
.right-panel-header .btn-primary {
  position: relative;
}

.right-panel-header .btn-primary::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-lg);
  background: var(--accent-primary);
  opacity: 0;
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
  z-index: -1;
}

@keyframes pulse {
  0%, 100% { opacity: 0; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(1.05); }
}

.right-panel-title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
}

.right-panel-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

/* Kanban columns */
.kanban {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.kanban-column {
  background: var(--surface-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.kanban-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--canvas-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.kanban-column-title {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
}

.kanban-column-count {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--surface-tertiary);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
}

.kanban-column-list {
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 60px;
}

/* Empty state for kanban columns */
.kanban-column-list:empty::before {
  content: 'No tasks yet';
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60px;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-style: italic;
}

/* Column-specific styling */
.kanban-column-todo .kanban-column-title {
  color: var(--text-secondary);
}

.kanban-column-progress .kanban-column-title {
  color: var(--semantic-warning);
}

.kanban-column-done .kanban-column-title {
  color: var(--semantic-success);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */

/* Tablet - Collapse right panel by default */
@media (max-width: 1200px) {
  .main {
    grid-template-columns: 1fr;
  }
  
  .right-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 360px;
    height: 100vh;
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: var(--z-overlay);
    box-shadow: var(--shadow-xl);
  }
  
  .right-panel.open {
    transform: translateX(0);
  }
  
  .panel-toggle {
    display: flex;
  }
}

/* Mobile - Stack everything */
@media (max-width: 768px) {
  .app {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform var(--duration-normal) var(--ease-out);
    z-index: var(--z-overlay);
    box-shadow: var(--shadow-xl);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .mobile-header {
    display: flex;
  }
  
  .chat-messages {
    padding: var(--space-4);
  }
  
  .chat-input-area {
    padding: var(--space-3);
  }
  
  .message {
    max-width: 95%;
  }
}

/* Desktop - Show panel toggle */
@media (min-width: 1201px) {
  .panel-toggle-mobile {
    display: none;
  }
}

/* Large screens */
@media (min-width: 1600px) {
  .main {
    grid-template-columns: 1fr 420px;
  }
}

/* ============================================
   MOBILE NAVIGATION OVERLAY
   ============================================ */

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  z-index: calc(var(--z-overlay) - 1);
}

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

/* Mobile header bar */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: var(--canvas-base);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 var(--space-4);
  align-items: center;
  justify-content: space-between;
  z-index: var(--z-sticky);
}

@media (max-width: 768px) {
  .mobile-header {
    display: flex;
  }
  
  .chat-area {
    padding-top: 64px;
  }
}

.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
}

.mobile-menu-btn:hover {
  background: var(--surface-secondary);
  color: var(--text-primary);
}

.mobile-menu-btn svg {
  width: 24px;
  height: 24px;
}

/* Panel toggle button - always visible */
.panel-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--surface-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.panel-toggle:hover {
  background: var(--surface-tertiary);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.panel-toggle svg {
  width: 20px;
  height: 20px;
}

/* Hide on very large screens where panel is always visible */
@media (min-width: 1400px) {
  .panel-toggle {
    display: none;
  }
}