/* Student Library Scoped Styles */

:root {
    --lib-primary: #0A34D3;
    --lib-primary-light: rgba(10, 52, 211, 0.08);
    --lib-dark: #1A1B24;
    --lib-border: #1A1B24;
    --lib-bg: #F8FBFF;
    --lib-card-bg: #FFFFFF;
    --lib-shadow: 0 4px 0 #1A1B24;
    --lib-shadow-hover: 0 8px 0 #1A1B24;
    --lib-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Page Root Wrapper */
.library-root {
    min-height: 100vh;
    background-color: var(--lib-bg);
    padding: 120px 24px 60px 24px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.library-container {
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
}

/* Header & Intro Section */
.library-header {
    text-align: center;
    margin-bottom: 40px;
    max-width: 700px;
}

.library-header h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--lib-dark);
    margin-bottom: 12px;
    line-height: 1.2;
}

.library-header p {
    font-size: 1.1rem;
    color: #555555;
    line-height: 1.6;
}

/* Board and Grade Selectors Grid */
.selector-section {
    background: var(--lib-card-bg);
    border: 3px solid var(--lib-border);
    border-radius: 24px;
    padding: 32px;
    box-shadow: var(--lib-shadow);
    margin-bottom: 40px;
    box-sizing: border-box;
}

.selector-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.25rem;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--lib-dark);
    display: flex;
    align-items: center;
    gap: 8px;
}

.selector-title::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 16px;
    background: var(--lib-primary);
    border-radius: 4px;
}

/* Board Toggle Row */
.board-toggle-row {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.board-btn {
    padding: 12px 28px;
    border: 3px solid var(--lib-border);
    border-radius: 16px;
    background: var(--lib-card-bg);
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--lib-transition);
    box-shadow: 0 4px 0 var(--lib-border);
}

.board-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 var(--lib-border);
}

.board-btn.active {
    background: var(--lib-primary);
    color: #FFFFFF;
    box-shadow: 0 4px 0 var(--lib-dark);
}

.board-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--lib-border);
}

/* Grade Grid Selector */
.grade-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 12px;
}

.grade-btn {
    height: 70px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--lib-border);
    border-radius: 16px;
    background: var(--lib-card-bg);
    font-weight: 800;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--lib-transition);
    box-shadow: 0 3px 0 var(--lib-border);
}

.grade-btn span {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-top: 2px;
    color: #666;
}

.grade-btn.active span {
    color: #FFFFFF;
}

.grade-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 0 var(--lib-border);
}

.grade-btn.active {
    background: var(--lib-primary);
    color: #FFFFFF;
    box-shadow: 0 3px 0 var(--lib-dark);
}

.grade-btn:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--lib-border);
}

/* Subjects Grid Section */
.subjects-section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--lib-dark);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.subject-tips-card {
    background: #FFFBEB;
    border: 2px dashed #F59E0B;
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

@media (max-width: 768px) {
    .overlay-actions-tooltip {
        padding: 8px !important;
        border-radius: 12px !important;
        max-width: calc(100vw - 48px) !important;
        width: 290px !important;
        box-shadow: 0 4px 0 #272727 !important;
    }
    
    .overlay-tooltip-header {
        padding-bottom: 4px !important;
        margin-bottom: 2px !important;
    }
    
    .overlay-tooltip-buttons {
        gap: 4px !important;
    }
    
    .overlay-tooltip-buttons .tooltip-action-btn {
        padding: 4px 8px !important;
        font-size: 0.72rem !important;
        border-width: 1.5px !important;
        box-shadow: 0 1.5px 0 #272727 !important;
    }
    
    .workspace-pane {
        padding: 16px !important;
        border-radius: 20px !important;
    }
    
    .pdf-page-container {
        border-radius: 12px !important;
        border-width: 2px !important;
        box-shadow: 0 4px 0 #272727 !important;
        margin-bottom: 20px !important;
    }
    
    .pdf-chunk-overlay:hover {
        border-width: 2px !important;
        box-shadow: 0 2px 0 #272727 !important;
        border-radius: 8px !important;
    }
}

.subject-card {
    border: 3px solid var(--lib-border);
    border-radius: 24px;
    background-color: var(--lib-card-bg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: var(--lib-transition);
    box-shadow: var(--lib-shadow);
    text-decoration: none;
    box-sizing: border-box;
}

.subject-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--lib-shadow-hover);
}

.subject-card-visual {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 3px solid var(--lib-border);
    background: linear-gradient(135deg, #E0F2FE 0%, #BAE6FD 100%);
    overflow: hidden;
}

.subject-card-icon {
    max-height: 100px;
    max-width: 100px;
    object-fit: contain;
    transition: var(--lib-transition);
}

.subject-card:hover .subject-card-icon {
    transform: scale(1.1) rotate(4deg);
}

.subject-card-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
    text-align: left;
}

.subject-card-title {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--lib-dark);
    margin: 0;
    font-family: 'Outfit', sans-serif;
}

.subject-card-desc {
    font-size: 0.85rem;
    color: #666666;
    margin: 0;
    line-height: 1.4;
}

/* Combined Study Workspace & Whiteboard View */
.workspace-root {
    width: 100%;
    height: 100vh;
    background-color: var(--lib-bg);
    padding: 92px 16px 12px 16px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.workspace-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    gap: 16px;
    flex-wrap: wrap;
}

.back-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border: 3px solid var(--lib-border);
    border-radius: 14px;
    background: var(--lib-card-bg);
    color: var(--lib-dark);
    font-weight: 700;
    text-decoration: none;
    font-size: 0.85rem;
    box-shadow: 0 3px 0 var(--lib-border);
    transition: var(--lib-transition);
}

.back-link-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 0 var(--lib-border);
}

.back-link-btn:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--lib-border);
}

.workspace-title-info h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--lib-dark);
    margin: 0;
    line-height: 1.1;
}

.workspace-title-info span {
    font-size: 0.8rem;
    color: #666;
    font-weight: 600;
}

/* Main Two-Column Split Layout */
.workspace-layout {
    display: grid;
    grid-template-columns: 1.15fr 1.15fr 0.7fr;
    gap: 16px;
    align-items: stretch;
    flex: 1;
    min-height: 0;
}

@media (max-width: 991.98px) {
    .workspace-layout {
        grid-template-columns: 1fr;
        overflow-y: auto;
    }
}

.workspace-pane {
    background: var(--lib-card-bg);
    border: 3px solid var(--lib-border);
    border-radius: 28px;
    padding: 16px;
    box-shadow: var(--lib-shadow);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
}

/* Left Pane Layout & Tab Switchers */
.pane-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 12px;
    flex-wrap: wrap;
}

.workspace-tabs {
    display: flex;
    gap: 8px;
    border: 3px solid var(--lib-border);
    background: #F1F5F9;
    padding: 4px;
    border-radius: 16px;
}

.workspace-tab {
    padding: 8px 18px;
    border: none;
    background: transparent;
    border-radius: 12px;
    font-size: 0.88rem;
    font-weight: 700;
    color: #475569;
    cursor: pointer;
    transition: var(--lib-transition);
}

.workspace-tab.active {
    background: var(--lib-dark);
    color: #FFFFFF;
}

/* Chapters Selector Dropdown */
.chapters-sidebar {
    min-width: 220px;
}

.chapters-dropdown-container {
    position: relative;
    width: 100%;
}

.chapters-select {
    width: 100%;
    padding: 10px 36px 10px 16px;
    border: 3px solid var(--lib-border);
    border-radius: 14px;
    font-size: 0.88rem;
    font-weight: 700;
    background-color: var(--lib-card-bg);
    color: var(--lib-dark);
    cursor: pointer;
    appearance: none;
    outline: none;
    transition: var(--lib-transition);
}

.chapters-select:focus {
    border-color: var(--lib-primary);
}

.chapters-dropdown-container::after {
    content: '▼';
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    color: var(--lib-dark);
    pointer-events: none;
}

/* Left Pane Content Views */
.pane-content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-height: 0;
    overflow: hidden;
}

/* PDF Viewer Frame Container */
.pdf-viewer-container {
    flex: 1 1 0%;
    min-height: 0;
    border: 3px solid var(--lib-border);
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    background-color: #525659;
}

.pdf-viewer-frame {
    width: 100%;
    height: 100%;
    border: none;
    position: absolute;
    top: 0;
    left: 0;
}

/* AI Study Guide (Scrollable text blocks) */
.ai-study-guide-container {
    flex: 1 1 0%;
    min-height: 0;
    max-height: none !important;
    border: 3px solid var(--lib-border);
    border-radius: 20px;
    background-color: #FAFAFA;
    position: relative;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.ai-study-guide-text-pane {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

/* Page-by-page PDF selection layout */
.pdf-page-container {
    position: relative;
    width: 100%;
    max-width: 680px;
    height: auto;
    margin: 0 auto 32px auto;
    border: 3px solid #272727;
    box-shadow: 0 8px 0 #272727;
    border-radius: 20px;
    background: #FFFFFF;
    overflow: visible;
    box-sizing: border-box;
}

.pdf-page-container canvas {
    display: block;
    width: 100% !important;
    height: auto !important;
    border-radius: 16px;
}

.pdf-page-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: #FEF3C7;
    border: 2px solid #272727;
    border-radius: 8px;
    padding: 4px 8px;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 0.72rem;
    color: #272727;
    z-index: 10;
    box-shadow: 2px 2px 0 #272727;
    pointer-events: none;
}

.pdf-chunk-overlay {
    position: absolute;
    box-sizing: border-box;
    background-color: rgba(99, 102, 241, 0.03);
    border: 1.5px dashed rgba(99, 102, 241, 0.25);
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.pdf-chunk-overlay:hover {
    border: 3px solid #272727;
    box-shadow: 0 4px 0 #272727;
    background-color: rgba(254, 240, 138, 0.25) !important;
    border-radius: 12px;
    z-index: 100 !important;
    transform: scale(1.015);
}

.overlay-actions-tooltip {
    position: absolute;
    bottom: 105%;
    left: 50%;
    transform: translateX(-50%) translateY(10px) scale(0.9);
    background: #FFFFFF;
    border: 3px solid #272727;
    box-shadow: 0 6px 0 #272727;
    border-radius: 16px;
    padding: 12px;
    display: none;
    flex-direction: column;
    gap: 8px;
    z-index: 1000;
    pointer-events: auto;
    width: max-content;
    max-width: 420px;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.pdf-chunk-overlay:hover .overlay-actions-tooltip,
.overlay-actions-tooltip.active {
    display: flex;
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1) !important;
}

.overlay-actions-tooltip.pinned {
    border-color: #0A34D3 !important;
    box-shadow: 0 6px 0 #0A34D3 !important;
}

.overlay-actions-tooltip.pinned .tooltip-badge {
    background: #0A34D3 !important;
}

.overlay-tooltip-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    border-bottom: 2px dashed rgba(39, 39, 39, 0.1);
    padding-bottom: 6px;
    margin-bottom: 4px;
}

.tooltip-badge {
    background: #272727;
    color: #FFFFFF;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: 8px;
    text-transform: uppercase;
    font-family: 'Outfit', sans-serif;
}

.tooltip-ai-indicator {
    color: #16A34A;
    font-size: 0.72rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
}

.overlay-tooltip-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}

.overlay-tooltip-buttons .tooltip-action-btn {
    padding: 5px 10px;
    border: 2px solid #272727;
    border-radius: 8px;
    background: #FFFFFF;
    color: #272727;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 2px 0 #272727;
    transition: all 0.1s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-family: 'Montserrat', sans-serif;
}

.overlay-tooltip-buttons .tooltip-action-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 0 #272727;
    background-color: #F8FAFC;
}

.overlay-tooltip-buttons .tooltip-action-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 0 #272727;
}

.tooltip-action-btn.explain-btn:hover { background-color: #FFE4E6; }
.tooltip-action-btn.summarize-btn:hover { background-color: #E0F2FE; }
.tooltip-action-btn.translate-btn:hover { background-color: #FEF3C7; }
.tooltip-action-btn.quiz-btn:hover { background-color: #F3E8FF; }
.tooltip-action-btn.career-btn:hover { background-color: #DCFCE7; }
.tooltip-action-btn.diagram-btn:hover { background-color: #FFEDD5; }

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Beautiful chunk card container following Neo-Brutalism rules */
.chunk-card {
    border: 3px solid var(--lib-border);
    border-radius: 24px;
    padding: 20px;
    margin-bottom: 24px;
    box-shadow: 0 6px 0 var(--lib-border);
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    gap: 14px;
    background: #FFFFFF;
    box-sizing: border-box;
    position: relative;
    translate: 0px;
    rotate: 0deg;
    scale: 1;
}

.chunk-card:hover {
    transform: translateY(-3px) scale(1.01);
    box-shadow: 0 9px 0 var(--lib-border);
}

.chunk-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chunk-badge {
    background: var(--lib-dark);
    color: #FFFFFF;
    font-size: 0.72rem;
    font-weight: 800;
    padding: 5px 10px;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 2px solid var(--lib-border);
}

.chunk-ai-badge {
    background: #F0FDF4;
    color: #16A34A;
    font-size: 0.72rem;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    border: 2px solid #16A34A;
}

.chunk-card-text {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.75;
    color: #1E293B;
    user-select: text;
}

.chunk-actions-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    border-top: 2px dashed rgba(26,27,36,0.1);
    padding-top: 12px;
}

.chunk-action-btn {
    padding: 6px 12px;
    border: 2px solid var(--lib-border);
    border-radius: 12px;
    background: #FFFFFF;
    color: var(--lib-dark);
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    box-shadow: 0 2px 0 var(--lib-border);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.chunk-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 0 var(--lib-border);
    background-color: #F1F5F9;
}

.chunk-action-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 0 var(--lib-border);
}

.chunk-card.variant-pink { background: linear-gradient(135deg, #FFE4E6 0%, #FECDD3 100%); }
.chunk-card.variant-blue { background: linear-gradient(135deg, #E0F2FE 0%, #BAE6FD 100%); }
.chunk-card.variant-yellow { background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%); }
.chunk-card.variant-purple { background: linear-gradient(135deg, #F3E8FF 0%, #E9D5FF 100%); }

/* Floating AI Actions Tooltip Toolbar */
.floating-ai-tooltip {
    position: absolute;
    display: none;
    z-index: 1000;
    background: var(--lib-dark);
    border: 2.5px solid #FFFFFF;
    border-radius: 14px;
    padding: 6px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
    align-items: center;
    gap: 4px;
    transform: translate(-50%, -100%);
    margin-top: -10px;
}

.floating-ai-tooltip::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-width: 8px 8px 0;
    border-style: solid;
    border-color: var(--lib-dark) transparent;
    display: block;
    width: 0;
}

.tooltip-action-btn {
    background: transparent;
    border: none;
    color: #E2E8F0;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--lib-transition);
    white-space: nowrap;
}

.tooltip-action-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #FFFFFF;
}

.ai-assistant-card {
    border: 3px solid var(--lib-border);
    border-radius: 20px;
    padding: 20px;
    background: #F0F4FF;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    flex: 45 1 0%;
    min-height: 0;
    overflow-y: auto;
}

.ai-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 800;
    color: var(--lib-dark);
    font-size: 0.95rem;
    border-bottom: 2px solid rgba(26,27,36,0.1);
    padding-bottom: 8px;
    flex-shrink: 0;
}

.ai-card-body {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #334155;
    flex: 1;
    min-height: 0;
    overflow-y: auto;
}

.ai-welcome-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 20px;
    height: 100%;
    min-height: 160px;
    box-sizing: border-box;
    gap: 8px;
}

.ai-welcome-icon {
    font-size: 2.2rem;
    animation: bounceWorm 2.5s infinite ease-in-out;
}

@keyframes bounceWorm {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-6px) scale(1.05); }
}

.ai-welcome-placeholder h4 {
    margin: 0;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.05rem;
    color: var(--lib-dark);
}

.ai-welcome-placeholder p {
    margin: 0;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.82rem;
    color: #64748B;
    max-width: 320px;
    line-height: 1.4;
}

/* AI Loader animation */
.ai-pulse-loader {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 10px 0;
}

.ai-pulse-line {
    height: 12px;
    background: #CBD5E1;
    border-radius: 4px;
    animation: pulseLoader 1.5s infinite;
}
.ai-pulse-line.w-80 { width: 80%; }
.ai-pulse-line.w-100 { width: 100%; }
.ai-pulse-line.w-90 { width: 90%; }

@keyframes pulseLoader {
    0% { opacity: 0.4; }
    50% { opacity: 0.8; }
    100% { opacity: 0.4; }
}

/* Quiz UI cards inside AI responses */
.quiz-question-box {
    font-weight: 800;
    margin-bottom: 12px;
}

.quiz-options-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.quiz-option-btn {
    width: 100%;
    padding: 10px 16px;
    border: 2px solid var(--lib-border);
    border-radius: 10px;
    background: #FFFFFF;
    text-align: left;
    font-weight: 700;
    font-size: 0.88rem;
    cursor: pointer;
    transition: var(--lib-transition);
}

.quiz-option-btn:hover {
    background-color: #F8FAFC;
}

.quiz-option-btn.correct {
    background-color: #DEF7EC;
    border-color: #31C48D;
    color: #03543F;
}

.quiz-option-btn.incorrect {
    background-color: #FDE8E8;
    border-color: #F05252;
    color: #9B1C1C;
}

.quiz-explanation {
    margin-top: 12px;
    font-size: 0.88rem;
    padding: 10px;
    background: #FFFFFF;
    border-left: 4px solid var(--lib-primary);
    border-radius: 4px;
}

/* Right Pane: Endless Drawing Whiteboard UI */
.whiteboard-pane {
    position: relative;
}

.whiteboard-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid var(--lib-border);
    padding-bottom: 16px;
    margin-bottom: 16px;
    gap: 16px;
    flex-wrap: wrap;
}

/* Drawing Toolbar Toolgroups */
.tool-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-label {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    color: #888;
    letter-spacing: 0.5px;
}

/* Color Dot Selectors */
.color-swatch-row {
    display: flex;
    gap: 6px;
}

.color-dot {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--lib-transition);
    padding: 0;
    box-sizing: border-box;
}

.color-dot:hover {
    transform: scale(1.1);
}

.color-dot.active {
    border-color: var(--lib-border);
    box-shadow: 0 0 0 2px #FFFFFF, 0 0 0 4px var(--lib-primary);
}

/* Brush Tool Selectors */
.brush-tool-btn {
    width: 34px;
    height: 34px;
    border: 3px solid var(--lib-border);
    border-radius: 10px;
    background: var(--lib-card-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--lib-transition);
    padding: 0;
    color: var(--lib-dark);
}

.brush-tool-btn:hover {
    background-color: var(--lib-primary-light);
}

.brush-tool-btn.active {
    background-color: var(--lib-dark);
    color: #FFFFFF;
}

/* Size Buttons */
.size-btn {
    width: 32px;
    height: 32px;
    border: 3px solid var(--lib-border);
    border-radius: 8px;
    background: var(--lib-card-bg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: var(--lib-transition);
}

.size-btn:hover {
    background-color: var(--lib-primary-light);
}

.size-btn.active {
    background-color: var(--lib-primary);
    color: #FFFFFF;
}

.size-dot {
    background-color: currentColor;
    border-radius: 50%;
}

.size-dot.thin { width: 4px; height: 4px; }
.size-dot.medium { width: 8px; height: 8px; }
.size-dot.thick { width: 12px; height: 12px; }

/* Control Buttons (Clear, Undo, Save) */
.ctrl-btn {
    padding: 8px 14px;
    border: 3px solid var(--lib-border);
    border-radius: 12px;
    background: var(--lib-card-bg);
    color: var(--lib-dark);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--lib-transition);
    box-shadow: 0 3px 0 var(--lib-border);
}

.ctrl-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 0 var(--lib-border);
    background-color: #F8FAFC;
}

.ctrl-btn:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--lib-border);
}

.ctrl-btn.btn-clear {
    border-color: #DC2626;
    color: #DC2626;
    box-shadow: 0 3px 0 #DC2626;
}

.ctrl-btn.btn-clear:hover {
    background-color: #FEF2F2;
}

.ctrl-btn.btn-save {
    background: var(--lib-primary);
    color: #FFFFFF;
}

.ctrl-btn.btn-save:hover {
    background: var(--lib-primary-hover);
}

/* Whiteboard Canvas Element Container */
.canvas-container {
    flex: 1;
    min-height: 0 !important;
    border: 3px solid var(--lib-border);
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    background-color: #FFFFFF;
    user-select: none;
}

.canvas-container.tool-pencil { cursor: crosshair; }
.canvas-container.tool-eraser { cursor: cell; }
.canvas-container.tool-hand { cursor: grab; }
.canvas-container.tool-hand:active { cursor: grabbing; }

.whiteboard-canvas {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: block;
}

/* Figma-like Canvas Zoom Controls HUD */
.canvas-zoom-hud {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--lib-border);
    border-radius: 12px;
    padding: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 100;
}

.zoom-btn {
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-weight: 800;
    font-size: 0.95rem;
    color: var(--lib-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--lib-transition);
}

.zoom-btn:hover {
    background: #E2E8F0;
}

.zoom-text {
    font-size: 0.8rem;
    font-weight: 800;
    padding: 0 6px;
    min-width: 48px;
    text-align: center;
    color: var(--lib-dark);
}

/* Empty State / Fallbacks */
.no-pdf-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 40px;
    text-align: center;
    color: #888;
}

.no-pdf-placeholder svg {
    margin-bottom: 16px;
    color: #AAA;
}

.no-pdf-placeholder h4 {
    font-family: 'Outfit', sans-serif;
    color: var(--lib-dark);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

/* ==========================================
   Study Space Guide Helpers Styling
   ========================================== */

/* Study Space Help Guide FAB */
.floating-help-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: #80CBC4;
    border: 3px solid var(--lib-border, #1A1B24);
    border-radius: 50px;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: var(--lib-shadow, 0 4px 0 #1A1B24);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2000;
}

.floating-help-fab:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 0 var(--lib-border, #1A1B24);
}

.floating-help-fab:active {
    transform: translateY(1px);
    box-shadow: 0 2px 0 var(--lib-border, #1A1B24);
}

.floating-help-fab .fab-icon {
    font-size: 1.25rem;
}

.floating-help-fab .fab-label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--lib-dark, #1A1B24);
}

/* Slide-out Contextual Help Drawer */
.help-guide-drawer {
    position: fixed;
    top: 0;
    right: -420px; /* Hidden initially */
    width: 380px;
    max-width: 90%;
    height: 100vh;
    background: #FFFFFF;
    border-left: 4px solid var(--lib-border, #1A1B24);
    box-shadow: -10px 0 30px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    z-index: 2500;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-sizing: border-box;
}

.help-guide-drawer.open {
    right: 0;
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px;
    border-bottom: 3px solid var(--lib-border, #1A1B24);
    background: #F4F6F9;
}

.drawer-header h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--lib-dark, #1A1B24);
    margin: 0;
}

.drawer-close-btn {
    background: transparent;
    border: none;
    font-size: 1.4rem;
    font-weight: 800;
    cursor: pointer;
    color: var(--lib-dark, #1A1B24);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.drawer-close-btn:hover {
    transform: scale(1.15);
}

.drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.drawer-body h4 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--lib-dark, #1A1B24);
    margin: 0 0 4px 0;
}

.drawer-body p, .drawer-body li {
    font-size: 0.88rem;
    color: #475569;
    line-height: 1.5;
    margin: 0;
}

.drawer-body ul {
    padding-left: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.subject-tips-card {
    background: #FFFBEB;
    border: 2px dashed #F59E0B;
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* AI Assistant Pane specific rules */
.ai-assistant-pane {
    background: #F0F4FF !important;
    display: flex;
    flex-direction: column;
    gap: 16px;
    box-sizing: border-box;
}

.ai-assistant-pane .ai-assistant-card {
    border: none !important;
    background: transparent !important;
    padding: 0 !important;
    box-shadow: none !important;
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow-y: auto;
}

.ai-assistant-pane .ai-card-body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.ai-assistant-pane .ai-welcome-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Ensure the horizontal top nav bar has a solid primary color background in the Study Workspace */
body:not(.scrolled-nav):not(.body-page-onboarding) header, 
body:not(.scrolled-nav):not(.body-page-onboarding) .header-transparent,
header, .header-transparent {
    background-color: #5F5AF6 !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
    backdrop-filter: blur(12px) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1) !important;
}

/* Adjust top padding of the workspace root to beautifully clear the solid 80px high top nav bar */
.workspace-root {
    padding-top: 88px !important;
}