/*
 * app-layout.css - Application Layout Structure
 * Shared across all modules
 */

/* =========================================================================
 * APP CONTAINER
 * ========================================================================= */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-areas: "sidebar main";
  background: var(--bg-app);
  transition: grid-template-columns var(--duration-normal) var(--ease-out);
}

.app--sidebar-collapsed {
  grid-template-columns: var(--sidebar-collapsed) 1fr;
}

.app--no-sidebar {
  grid-template-columns: 1fr;
  grid-template-areas: "main";
}

/* Module-specific app variants */
.app--chat,
.app--devmind {
  grid-template-columns: var(--sidebar-width) 1fr;
}

.app--test {
    grid-template-columns: var(--sidebar-maxcompact) 1fr;
}

.app--speaking {
    grid-template-columns: var(--sidebar-compact) 1fr;
}

.app--dual-mode {
  grid-template-columns: var(--sidebar-width) 1fr;
}

/* =========================================================================
 * SIDEBAR
 * ========================================================================= */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  overflow: hidden;
  max-height: 100vh;
  transition: width var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.sidebar--dark {
  background: var(--gray-900);
  border-right-color: var(--gray-800);
}

.sidebar--compact {
  width: var(--sidebar-compact);
}

.sidebar--test {
  background: linear-gradient(180deg, var(--bg-sidebar) 0%, var(--gray-50) 100%);
}

.sidebar--collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar--collapsed .sidebar__titles,
.sidebar--collapsed .sidebar__subtitle,
.sidebar--collapsed .sidebar__section-content,
.sidebar--collapsed .nav-item span {
  display: none;
}

/* Sidebar Header */
.sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.sidebar--dark .sidebar__header {
  border-bottom-color: var(--gray-800);
}

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

.sidebar__logo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--brand-primary);
  color: white;
  border-radius: var(--border-radius-lg);
  font-size: var(--text-lg);
  flex-shrink: 0;
}

.sidebar__logo--student {
  background: var(--color-success);
}

.sidebar__logo--gradient {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-secondary) 100%);
}

.sidebar__logo--ai {
  background: var(--gray-900);
  position: relative;
}

.sidebar__logo--ai .sidebar__logo-glow {
  position: absolute;
  inset: -2px;
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-accent) 100%);
  border-radius: var(--border-radius-lg);
  opacity: 0.5;
  z-index: -1;
  animation: pulse 2s ease-in-out infinite;
}

.sidebar__logo--code {
  background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
}

.sidebar__logo--speaking {
  background: var(--brand-secondary);
}

.sidebar__logo--ielts {
  background: linear-gradient(135deg, var(--color-warning) 0%, var(--brand-primary) 100%);
}

.sidebar__titles {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.sidebar__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  line-height: 1.2;
  white-space: nowrap;
}

.sidebar--dark .sidebar__title {
  color: var(--gray-100);
}

.sidebar__subtitle {
  font-size: var(--text-xs);
  color: var(--text-muted);
  white-space: nowrap;
}

.sidebar__collapse {
  flex-shrink: 0;
}

/* Sidebar Content */
.sidebar__content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2);
}

/* Sidebar Section */
.sidebar__section {
    padding: var(--space-2) 0;
    flex-shrink: 0;
}

.sidebar__section:first-child {
  padding-top: var(--space-2);
}

.sidebar__section--grow {
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    /*min-height: 400px;*/
    overflow: hidden;
}

    .sidebar__section--grow .nav-list {
        flex: 1 1 auto;
        overflow-y: auto;
        max-height: none;
    }

.sidebar__section-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
}

.sidebar__section-header--sticky {
  position: sticky;
  top: 0;
  background: var(--bg-sidebar);
  z-index: 1;
}

.sidebar--dark .sidebar__section-header--sticky {
  background: var(--gray-900);
}

.sidebar__section-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-secondary);
  padding: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar__section-content {
  padding: var(--space-2);
}

/* Sidebar Accordion */
.sidebar__accordion {
  border: none;
}

.sidebar__accordion > summary {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--border-radius-md);
  transition: background var(--duration-fast) var(--ease-out);
  list-style: none;
}

.sidebar__accordion > summary::-webkit-details-marker {
  display: none;
}

.sidebar__accordion > summary:hover {
  background: var(--bg-hover);
}

.sidebar__accordion-icon {
  margin-left: auto;
  font-size: var(--text-xs);
  transition: transform var(--duration-fast) var(--ease-out);
}

.sidebar__accordion[open] .sidebar__accordion-icon {
  transform: rotate(180deg);
}

/* Sidebar Footer */
.sidebar__footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
}

.sidebar--dark .sidebar__footer {
  border-top-color: var(--gray-800);
}

/* =========================================================================
 * MAIN CONTENT AREA
 * ========================================================================= */
.main {
  grid-area: main;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-app);
}

.main--practice,
.main--speaking {
  position: relative;
}

.main--chat {
  display: flex;
  flex-direction: column;
}

.main--code {
  background: var(--bg-app);
}

.main--test {
  display: flex;
  flex-direction: column;
}

/* =========================================================================
 * TOPBAR
 * ========================================================================= */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 var(--space-4);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  gap: var(--space-4);
}

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

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

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.breadcrumb__item {
  white-space: nowrap;
}

.breadcrumb__item--current {
  color: var(--text-primary);
  font-weight: var(--font-medium);
}

.breadcrumb__separator {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* =========================================================================
 * WORKSPACE
 * ========================================================================= */
.workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: var(--space-4);
}

.workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-light);
  gap: var(--space-4);
}

.workspace-header__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.workspace-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.workspace-header__title {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  background: transparent;
  border: none;
  padding: var(--space-1) var(--space-2);
  margin: calc(var(--space-1) * -1) calc(var(--space-2) * -1);
  border-radius: var(--border-radius-md);
  transition: background var(--duration-fast) var(--ease-out);
  min-width: 200px;
}

.workspace-header__title:hover {
  background: var(--bg-hover);
}

.workspace-header__title:focus {
  background: var(--bg-input);
  outline: none;
}

/* =========================================================================
 * CONTROL BAR (Bottom)
 * ========================================================================= */
.control-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--control-bar-height);
  padding: 0 var(--space-4);
  background: var(--bg-panel);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
  gap: var(--space-4);
}

.control-bar__left,
.control-bar__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.control-bar__center {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex: 1;
}

.control-bar__status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* =========================================================================
 * PANEL SYSTEM
 * ========================================================================= */
.panel {
  background: var(--bg-panel);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.panel__header h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.panel__header h3 i {
  color: var(--text-muted);
}

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

.panel__footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
}

/* Panel Toolbar */
.panel-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-input);
  border-bottom: 1px solid var(--border-light);
  gap: var(--space-4);
}

.panel-toolbar__left,
.panel-toolbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.panel-toolbar h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
}

/* =========================================================================
 * SLIDE-OUT PANELS
 * ========================================================================= */
.assistant-panel,
.learning-panel,
.media-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 400px;
  max-width: 100vw;
  background: var(--bg-panel);
  border-left: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-xl);
}

.assistant-panel--open,
.learning-panel--open,
.media-panel--open,
.assistant-panel[style*="block"],
.learning-panel[style*="block"],
.media-panel[style*="block"] {
  transform: translateX(0);
}

.assistant-panel__header,
.learning-panel__header,
.media-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
}

.assistant-panel__header h3,
.learning-panel__header h2,
.media-panel__header h3 {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
}

.assistant-panel__messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.assistant-panel__input {
  display: flex;
  gap: var(--space-2);
  padding: var(--space-4);
  border-top: 1px solid var(--border-light);
}

.assistant-panel__input textarea {
  flex: 1;
  resize: none;
  min-height: 40px;
  max-height: 120px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border-default);
  border-radius: var(--border-radius-md);
  background: var(--bg-input);
}

.learning-panel__content,
.media-panel__content {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.learning-panel__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4);
  border-top: 1px solid var(--border-light);
}

/* =========================================================================
 * FLOATING ACTION BUTTON
 * ========================================================================= */
.app-fab {
    position: fixed;
    bottom: calc(var(--control-bar-height) + var(--space-4));
    right: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background: var(--brand-primary);
    color: white;
    border-radius: var(--border-radius-full);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    z-index: var(--z-sticky);
    transition: all var(--duration-fast) var(--ease-out);
}

[data-theme="light"] .app-fab {
    box-shadow: var(--shadow-sm);
}

.app-fab:hover {
  background: var(--brand-primary-hover);
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

.app-fab--assistant {
  background: var(--brand-secondary);
}

.app-fab--assistant:hover {
  background: var(--brand-secondary-hover);
}

.app-fab__tooltip {
  position: absolute;
  right: calc(100% + var(--space-2));
  white-space: nowrap;
  padding: var(--space-2) var(--space-3);
  background: var(--bg-tooltip);
  color: var(--text-inverse);
  font-size: var(--text-sm);
  border-radius: var(--border-radius-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease-out);
}

.app-fab:hover .app-fab__tooltip {
  opacity: 1;
  visibility: visible;
}

/* =========================================================================
 * RESPONSIVE
 * ========================================================================= */
@media (max-width: 1024px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
  }
  
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: var(--z-modal);
    transform: translateX(-100%);
  }
  
  .sidebar--open {
    transform: translateX(0);
  }
  
  .assistant-panel,
  .learning-panel,
  .media-panel {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .topbar {
    padding: 0 var(--space-3);
  }
  
  .topbar__center {
    display: none;
  }
  
  .breadcrumb {
    display: none;
  }
  
  .workspace {
    padding: var(--space-3);
  }
  
  .control-bar {
    padding: 0 var(--space-3);
  }
  
  .app-fab {
    bottom: calc(var(--control-bar-height) + var(--space-3));
    right: var(--space-3);
    width: 48px;
    height: 48px;
  }
}