/* ========================================
   SIDEBAR COMPONENTS - Left & Right
   Shared sidebar styles and behaviors
   ======================================== */

/* ========== BASE SIDEBAR STYLES ========== */
.sidebar,
.left-sidebar,
.right-sidebar {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-secondary);
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    z-index: 2;
}

.left-sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    border-right: 1px solid var(--border-color);
}

.right-sidebar {
    width: var(--right-sidebar-width);
    min-width: var(--right-sidebar-width);
    border-left: 1px solid var(--border-color);
    height: 100dvh;
}

/* ========== COLLAPSED STATE ========== */
.sidebar.collapsed,
.left-sidebar.collapsed {
    width: var(--collapsed-width);
    min-width: var(--collapsed-width);
}

.right-sidebar.collapsed {
    width: 0;
    min-width: 0;
    border-left: none;
}

.left-sidebar.collapsed .sidebar-title,
.left-sidebar.collapsed .home-title,
.left-sidebar.collapsed #themeToggleBtn,
.left-sidebar.collapsed .sidebar-header-title,
.left-sidebar.collapsed .chats-list,
.left-sidebar.collapsed .student-info,
.left-sidebar.collapsed .notes-section,
.left-sidebar.collapsed .sidebar-content,
.left-sidebar.collapsed .sidebar-nav-item > span:not(.nav-icon),
.left-sidebar.collapsed .sidebar-chats-section,
.left-sidebar.collapsed .sidebar-student-info,
.left-sidebar.collapsed .sidebar-student-level-badge,
.left-sidebar.collapsed .sidebar-chats-title,
.left-sidebar.collapsed .sidebar-nav-global span,
.left-sidebar.collapsed .sidebar-header-actions,
.left-sidebar.collapsed .sidebar-divider {
    display: none;
}

.left-sidebar.collapsed .sidebar-new-chat-section {
    padding: 8px 0 0;
    display: flex;
    justify-content: center;
}

.left-sidebar.collapsed .sidebar-nav-new-chat {
    width: 34px;
    height: 34px;
    padding: 0;
    border-radius: 10px;
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #FFF;
    font-size: 18px;
}

.left-sidebar.collapsed .sidebar-nav-new-chat:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    opacity: 0.85;
}

.left-sidebar.collapsed .sidebar-nav-new-chat span {
    display: none;
}

.left-sidebar.collapsed .left-btn-icon-home {
    justify-content: center;
}

.home-icon-svg {
    display: none;
}

.left-sidebar.collapsed .home-icon-svg {
    display: block;
}

.left-sidebar.collapsed .sidebar-header-top {
    justify-content: center;
}

.left-sidebar.collapsed .sidebar-header {
    padding: 12px 0;
}

.right-sidebar.collapsed .sidebar-header-top {
    justify-content: center;
}

.right-sidebar.collapsed .sidebar-header {
    padding: 12px 0;
}

.left-sidebar.collapsed .sidebar-nav {
    padding: 8px 0;
    gap: 2px;
}

.left-sidebar.collapsed .sidebar-nav-item {
    justify-content: center;
    padding: 10px 0;
    gap: 0;
}

.left-sidebar.collapsed .sidebar-nav-item .nav-icon {
    opacity: 0.7;
}

.left-sidebar.collapsed .sidebar-student-card {
    justify-content: center;
    padding: 12px 0;
}

.left-sidebar.collapsed .btn-new-chat {
    margin: 12px auto;
    padding: 12px;
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.left-sidebar.collapsed .btn-new-chat span,
.left-sidebar.collapsed .chat-item-name {
    display: none;
}

.right-sidebar.collapsed .right-title,
.right-sidebar.collapsed .sidebar-stats-title,
.right-sidebar.collapsed .info-section,
.right-sidebar.collapsed .stats-grid,
.right-sidebar.collapsed h3,
.right-sidebar.collapsed .sidebar-stats-section,
.right-sidebar.collapsed .sidebar-content-section {
    display: none;
}

/* ========== SIDEBAR HEADER ========== */
.sidebar-header {
    padding: 22px 20px 18px;
    /* border-bottom: 1px solid var(--border-color); */
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-header h1 {
    font-size: 19px;
    font-weight: 600;
}

.sidebar-header-top {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header-title {
    text-align: center;
}

.sidebar-title,
.home-title,
.right-title {
    font-family: var(--font-serif-display);
    font-size: 22px;
    font-weight: 400;
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-primary);
    transition: 0.5s ease;
}

/* ========== SIDEBAR BUTTONS ========== */
.expand-btn,
.collapse-btn,
.left-btn-icon-home,
.left-btn-icon-toggle,
.right-btn-icon {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 6px;
    padding: 4px;
    transition: color 0.2s ease, background 0.2s ease;
    display: flex;
    align-items: center;
}

.left-btn-icon-home {
    color: var(--text-primary);
}

.expand-btn:hover,
.collapse-btn:hover,
.left-btn-icon-home:hover,
.left-btn-icon-toggle:hover,
.right-btn-icon:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    /* outline: 1px solid var(--border-color); */
}

.sidebar-header-actions {
    display: flex;
    gap: 4px;
    align-items: center;
}

.btn-topics-page {
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background 0.15s var(--ease-snappy), color 0.15s var(--ease-snappy);
    justify-content: center;
    align-items: center;
}

/* ========== SIDEBAR STUDENT INFO (TOP) ========== */
.sidebar-student-info {
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-student-card-row {
    display: flex;
    gap: 12px;
    align-items: center;
}

.sidebar-student-avatar {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(145deg, var(--bg-hover), var(--border-color));
    border: 1.5px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif-display);
    font-size: 16px;
    color: var(--text-primary);
    font-style: italic;
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.sidebar-student-name {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.2;
    margin-bottom: 3px;
    color: var(--text-primary);
}

.sidebar-student-name:empty {
    display: none;
}

.left-sidebar.collapsed .sidebar-student-name {
    display: none;
}

.sidebar-student-level-badge {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-primary);
    background: color-mix(in srgb, var(--accent-primary) 10%, transparent);
    padding: 2px 7px;
    border-radius: 4px;
    border: 1px solid color-mix(in srgb, var(--accent-primary) 20%, transparent);
}

.sidebar-student-level-badge:empty {
    display: none;
}

.sidebar-student-description {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-top: 12px;
    line-height: 1.45;
    font-style: italic;
}

.sidebar-student-description:empty {
    display: none;
}

.left-sidebar.collapsed .sidebar-student-description {
    display: none;
}

/* ========== SIDEBAR STUDENT INFO CLICKABLE ========== */
.sidebar-student-info {
    cursor: pointer;
    transition: background 0.15s ease;
    border-radius: 10px;
    margin: 0 4px;
    padding: 8px 12px 8px 12px;
}

.sidebar-student-info:hover {
    background: var(--bg-tertiary);
}

.sidebar-student-chevron {
    color: var(--text-tertiary);
    opacity: 0.5;
    flex-shrink: 0;
    transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.sidebar-student-info.nav-open .sidebar-student-chevron {
    transform: rotate(180deg);
}

.left-sidebar.collapsed .sidebar-student-chevron {
    display: none;
}

/* ========== SIDEBAR NAV COLLAPSE ========== */
.sidebar-nav-collapse {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.25s ease;
}

.sidebar-nav-collapse.open {
    max-height: 400px;
    opacity: 1;
}

/* ========== SIDEBAR NEW CHAT SECTION ========== */
.sidebar-new-chat-section {
    padding: 14px 14px 6px;
}

.sidebar-nav-new-chat {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 11px 16px;
    background: transparent;
    color: var(--accent-primary);
    border: 1.5px solid color-mix(in srgb, var(--accent-primary) 30%, transparent);
    border-radius: 10px;
    cursor: pointer;
    font-size: 13.5px;
    font-weight: 500;
    font-family: inherit;
    letter-spacing: 0.01em;
    transition: all 0.2s ease;
}

.sidebar-nav-new-chat:hover {
    background: color-mix(in srgb, var(--accent-primary) 8%, transparent);
    border-color: color-mix(in srgb, var(--accent-primary) 50%, transparent);
}

/* ========== SIDEBAR NAVIGATION ========== */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    padding: 6px 10px;
    gap: 1px;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 8px 12px;
    border-radius: 9px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 13.5px;
    font-weight: 400;
    transition: all 0.15s ease;
    text-decoration: none;
    white-space: nowrap;
    border: 1px solid transparent;
    margin-bottom: 1px;
}

.sidebar-nav-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-nav-item.active {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
    font-weight: 500;
}

.sidebar-nav-item svg {
    flex-shrink: 0;
}

.sidebar-nav-item .nav-icon {
    opacity: 0.55;
    display: flex;
}

.sidebar-nav-item.active .nav-icon {
    opacity: 1;
}

/* ========== SIDEBAR DIVIDER ========== */
.sidebar-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 20px;
}

/* ========== SIDEBAR CHATS SECTION ========== */
.sidebar-chats-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    padding: 10px 10px;
}

.sidebar-chats-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 12px 10px;
}

.sidebar-chats-title {
    font-family: var(--font-serif-display);
    font-size: 13px;
    font-weight: 400;
    color: var(--text-tertiary);
    font-style: italic;
}

.btn-new-chat-small {
    background: transparent;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    padding: 2px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    transition: color 0.15s ease;
}

.btn-new-chat-small:hover {
    color: var(--text-primary);
}

.sidebar-chats-list {
    flex: 1;
    overflow-y: auto;
    transition: max-height 0.3s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.25s ease;
    max-height: 100dvh;
}

.sidebar-chats-list.collapsed {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}

.sidebar-chat-name {
    font-size: 13.5px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: block;
    flex: 1;
}

.sidebar-chat-item.active .sidebar-chat-name,
.sidebar-chat-item:hover .sidebar-chat-name {
    color: var(--text-primary);
}

.sidebar-chat-item.active .sidebar-chat-name {
    font-weight: 500;
}

/* Chat item with menu */
.sidebar-chat-item {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.15s ease;
    border: 1px solid transparent;
    margin-bottom: 2px;
    margin-right: 5px;
}


.sidebar-chat-item:hover {
    background: var(--bg-tertiary);
}

.sidebar-chat-item.active {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
}

.sidebar-chat-menu {
    position: relative;
    flex-shrink: 0;
    opacity: 0;
    transition: opacity 0.15s;
}

.sidebar-chat-item:hover .sidebar-chat-menu {
    opacity: 1;
}

.sidebar-chat-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 14px;
    line-height: 1;
    letter-spacing: 0.1em;
    opacity: 0.5;
}

.sidebar-chat-menu-btn:hover {
    opacity: 1;
    color: var(--text-primary);
}

.sidebar-chat-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 4px 0;
    min-width: 100px;
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.sidebar-chat-dropdown.open {
    display: block;
}

.sidebar-chat-dropdown-item {
    padding: 6px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    white-space: nowrap;
}

.sidebar-chat-dropdown-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-chat-dropdown-item.danger:hover {
    background: var(--danger);
    color: white;
}

.sidebar-chat-empty {
    padding: 12px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 12px;
}

/* ========== RIGHT SIDEBAR SPECIFIC ========== */
.right-btn-icon-toggle {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 6px;
    transition: color 0.15s ease;
    display: flex;
    align-items: center;
    padding: 4px;
}

.right-btn-icon-toggle:hover {
    color: var(--text-primary);
}

/* Right sidebar collapsed state */
.right-sidebar.collapsed .sidebar-stats-section,
.right-sidebar.collapsed .sidebar-content-section {
    display: none;
}

/* ========== SIDEBAR STATS SECTION (RIGHT SIDEBAR) ========== */
.sidebar-stats-section {
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-stats-header {
    display: flex;
    align-items: center;
    padding: 20px 18px 8px;
}

.sidebar-stats-title {
    font-size: 10.5px;
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.sidebar-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 8px 18px 16px;
}

.sidebar-stat-item {
    background: var(--bg-tertiary);
    border-radius: 10px;
    padding: 12px 14px;
    cursor: pointer;
    transition: background 0.15s var(--ease-snappy), border-color 0.15s var(--ease-snappy);
    text-align: center;
    border: 1px solid var(--border-color);
}

.sidebar-stat-item:hover {
    background: var(--bg-hover);
    border-color: var(--text-tertiary);
}

.sidebar-stat-item.active {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
}

.sidebar-stat-value {
    font-family: var(--font-serif-display);
    font-size: 24px;
    font-weight: 400;
    color: var(--text-primary);
    line-height: 1.1;
    margin-bottom: 4px;
}

.sidebar-stat-value.DONE,
.stat-value.DONE {
    color: #22c55e;
}

.sidebar-stat-value.REPEAT,
.stat-value.REPEAT {
    color: #f59e0b;
}

.sidebar-stat-value.KNOWN,
.stat-value.KNOWN {
    color: #3b82f6;
}

.sidebar-stat-value.NOT_STARTED,
.stat-value.NOT_STARTED {
    color: var(--text-tertiary);
}

.sidebar-stat-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-top: 2px;
}

/* ========== SIDEBAR CONTENT SECTION (RIGHT SIDEBAR) ========== */
.sidebar-content-section {
    flex: 1;
    overflow-y: auto;
}

/* ========== SIDEBAR CONTENT AREA ========== */
.sidebar-content {
    padding: 20px;
    overflow-y: auto;
}

/* ========== INFO SECTIONS ========== */
.info-section {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border-color);
}

.info-section h3 {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    cursor: pointer;
    user-select: none;
}

.section-header:hover h4 {
    color: var(--text-primary);
}

.section-header h4 {
    font-size: 10.5px;
    font-weight: 700;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.section-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
}

.toggle-icon {
    transition: transform 0.2s ease;
    font-size: 14px;
    color: var(--text-secondary);
}

.toggle-icon.collapsed {
    transform: rotate(-90deg);
}

/* ========== INFO ITEM ENTRANCE ANIMATION ========== */
@keyframes infoItemIn {
    from { opacity: 0; transform: translateY(6px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.info-item.is-new {
    animation: infoItemIn 0.2s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* ========== INFO LISTS ========== */
.info-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
    max-height: 35dvh;
    min-height: 0;
    overflow-y: auto;
    overflow-x: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    padding-right: 4px;
    scroll-snap-type: y mandatory;
}

.info-list.collapsed {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
}

.info-item {
    padding: 9px 13px;
    flex-shrink: 0;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    font-size: 13.5px;
    font-weight: 500;
    font-family: var(--font-serif-body);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.15s ease;
    min-height: 0;
    scroll-snap-align: start;
    cursor: pointer;
    color: var(--text-primary);
}

.info-item.empty {
    color: var(--text-tertiary);
    font-style: italic;
    font-size: 13px;
    font-family: var(--font-serif-display);
    background: transparent;
    border: none;
    cursor: default;
}

.info-item:not(.empty):hover {
    background: var(--bg-hover);
}

.btn-remove {
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 2px 5px;
    border-radius: 4px;
    font-size: 14px;
    line-height: 1;
    opacity: 0;
    transition: background 0.15s var(--ease-snappy), color 0.15s var(--ease-snappy), opacity 0.15s var(--ease-snappy);
}

.info-item:hover .btn-remove {
    opacity: 1;
}

.btn-remove:hover {
    background: var(--danger);
    color: white;
}

/* ========== NOTES POPUP ========== */
#notesModal .modal-content {
    max-width: 500px;
}

#notesModal .notes-popup-body {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#notesModal .notes-textarea {
    width: 100%;
    min-height: 200px;
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    resize: vertical;
    font-family: inherit;
}

#notesModal .notes-popup-actions {
    display: flex;
    justify-content: flex-end;
}

#notesModal .btn-save-notes {
    opacity: 0.5;
    pointer-events: none;
    transition: all 0.2s;
}

#notesModal .btn-save-notes.visible {
    opacity: 1;
    pointer-events: auto;
}

/* ========== ADD BUTTON IN SECTIONS ========== */
.btn-add {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--accent-primary);
    display: flex;
    padding: 2px;
    font-size: 16px;
    transition: color 0.15s ease;
}

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

/* ========== FLOATING SIDEBAR TOGGLES (shared across pages) ========== */
.float-toggle-left,
.float-toggle-right {
    position: absolute;
    top: 14px;
    z-index: 10;
}

.float-toggle-left { left: 16px; }
.float-toggle-right { right: 16px; }

.float-toggle-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--float-btn-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    box-shadow: var(--float-btn-shadow);
    transition: all 0.15s ease;
}

.float-toggle-btn:hover {
    opacity: 1 !important;
    border-color: var(--text-tertiary);
    box-shadow: var(--float-btn-shadow), 0 0 0 1px var(--text-tertiary);
}

.float-toggle-btn.inactive {
    color: var(--text-tertiary);
}

/* ========== LESSON PAGE OVERRIDES ========== */
/* Hide sidebar toggle on lesson page — floating toggles replace it */
.lesson-page .left-sidebar .sidebar-header-actions .left-btn-icon-toggle[onclick*="toggleLeftSidebar"] {
    display: none;
}