/* Word Blocks - Main Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* AAC Color Coding (based on research best practices) */
    --color-verb: #FF6B9D;      /* Pink for actions */
    --color-noun: #FFA500;      /* Orange for things/people */
    --color-pronoun: #FFD700;   /* Yellow for pronouns */
    --color-adjective: #4169E1; /* Blue for descriptors */
    --color-adverb: #32CD32;    /* Green for manner/time */
    --color-preposition: #9370DB; /* Purple for relationships */
    
    /* UI Colors */
    --primary-bg: #f8fafc;
    --secondary-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #3b82f6;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
}

body {
    font-family: var(--font-family);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header Styles */
.app-header {
    background: var(--secondary-bg);
    border-bottom: 2px solid var(--border-color);
    padding: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.app-header h1 {
    color: var(--accent);
    font-size: var(--font-size-3xl);
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
}

.header-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.control-btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: all 0.2s;
}

.control-btn:hover:not(:disabled) {
    background: #2563eb;
    transform: translateY(-1px);
}

.control-btn:disabled {
    background: var(--text-secondary);
    cursor: not-allowed;
}

/* Main Content with Sidebar Layout */
.main-content {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-lg);
    max-width: 1800px;
    margin: 0 auto;
    width: 100%;
}

/* Content Column (Main Area) */
.content-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    min-width: 0; /* Prevent flex overflow */
}

/* Vocabulary Sidebar */
.vocabulary-sidebar {
    width: 320px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    min-height: 0; /* Allow flex children to shrink */
}

/* Sentence Display - Featured */
.sentence-display {
    background: var(--secondary-bg);
    border: 3px solid var(--accent);
    border-radius: 12px;
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.15);
}

.sentence-display.featured {
    background: linear-gradient(135deg, #ffffff, #f8fafc);
}

.section-title {
    font-size: var(--font-size-2xl);
    color: var(--accent);
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 700;
}

.sentence-box {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 3px dashed var(--accent);
    border-radius: 12px;
    padding: var(--spacing-xl);
    font-size: 2rem;
    font-weight: 600;
    text-align: center;
    line-height: 1.4;
}

.sentence-box .placeholder {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 1.5rem;
}

.sentence-box .sentence-text {
    color: var(--text-primary);
    font-weight: 700;
}

.sentence-controls {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

/* Semantic Network Section */
.semantic-network-section {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
}

.semantic-network-section h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

#semantic-canvas {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: #fafafa;
    width: 100%;
    height: 300px;
    cursor: pointer;
}

.network-info {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    text-align: center;
}

/* Word Selection - Sidebar Version */
.word-selection {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.word-selection h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.word-categories {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    flex-shrink: 0;
}

.category-btn {
    background: var(--border-color);
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all 0.2s;
    flex: 1;
    min-width: 60px;
}

.category-btn:hover,
.category-btn.active {
    background: var(--accent);
    color: white;
}

/* Sidebar word tiles - single column */
.vocabulary-sidebar .word-tiles {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    overflow-y: auto;
    flex: 1;
}

/* Default word tiles (for when not in sidebar) */
.word-tiles {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-sm);
    max-height: 400px;
    overflow-y: auto;
}

/* Word Tile Styles */
.word-tile {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.word-tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.word-tile.selected {
    border-color: var(--accent);
    background: #eff6ff;
}

.word-tile .symbol {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-xs);
}

.word-tile .word {
    font-weight: 600;
    font-size: var(--font-size-base);
}

.word-tile .pos-tag {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* Part of Speech Colors */
.word-tile.verb { border-left: 4px solid var(--color-verb); }
.word-tile.noun { border-left: 4px solid var(--color-noun); }
.word-tile.pronoun { border-left: 4px solid var(--color-pronoun); }
.word-tile.adjective { border-left: 4px solid var(--color-adjective); }
.word-tile.adverb { border-left: 4px solid var(--color-adverb); }
.word-tile.preposition { border-left: 4px solid var(--color-preposition); }

/* Relationship Selector */
.relationship-selector {
    grid-column: 1 / -1;
    background: var(--warning);
    border: 2px solid #f59e0b;
    border-radius: 12px;
    padding: var(--spacing-lg);
    animation: slideIn 0.3s ease-out;
}

.relationship-selector h3 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.relationship-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.relation-btn {
    background: white;
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-md);
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: all 0.2s;
}

.relation-btn:hover {
    background: #f1f5f9;
    transform: translateY(-1px);
}

/* Filter Controls */
.filter-controls {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
}

.filter-controls h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

.filter-group {
    margin-bottom: var(--spacing-md);
}

.filter-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.filter-group select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: var(--font-size-base);
}

.filter-toggles {
    display: flex;
    gap: var(--spacing-sm);
}

.toggle-btn {
    background: var(--border-color);
    color: var(--text-primary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all 0.2s;
}

.toggle-btn:hover,
.toggle-btn.active {
    background: var(--error);
    color: white;
}

/* Status Bar */
.status-bar {
    background: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
}

#status-text {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

/* Animations */
@keyframes slideIn {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .app-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .header-controls {
        width: 100%;
        justify-content: center;
    }
    
    .word-tiles {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .relationship-buttons {
        grid-template-columns: 1fr;
    }
}

/* Accessibility */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
button:focus,
select:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.word-tile:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Additional CSS classes for JavaScript interactions */
.has-sentence {
    background: var(--secondary-bg);
    border-color: var(--success);
    animation: pulse 0.3s ease-out;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.02); }
    100% { transform: scale(1); }
}

.selected {
    background: var(--accent) !important;
    color: white !important;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3);
}

.status-message {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.status-message.status-info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.status-message.status-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.filter-indicator {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--warning);
    color: white;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    font-size: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.canvas-tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    font-size: var(--font-size-sm);
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
    transform: translate(-50%, -100%);
    margin-top: -8px;
}

.canvas-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 4px solid transparent;
    border-top-color: rgba(0, 0, 0, 0.9);
}

/* Active state for toggle buttons */
.toggle-btn.active {
    background: var(--accent) !important;
    color: white !important;
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.category-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* Radial Menu Styles */
.radial-menu-canvas {
    position: absolute;
    z-index: 1000;
    border-radius: 50%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.radial-tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: var(--spacing-sm);
    border-radius: 6px;
    font-size: var(--font-size-sm);
    pointer-events: none;
    z-index: 1001;
    max-width: 200px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.tooltip-title {
    font-weight: bold;
    margin-bottom: 2px;
    color: #ffffff;
}

.tooltip-description {
    opacity: 0.9;
    font-size: 11px;
    line-height: 1.3;
}

/* Radial menu container */
.radial-menu-container {
    position: relative;
    display: inline-block;
}

/* Hide radial menu initially */
.radial-menu-canvas {
    display: none;
}

/* Sentence History Styles */
.sentence-history {
    background: var(--secondary-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: var(--spacing-lg);
    grid-column: 1 / -1;
}

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

.history-header h3 {
    color: var(--text-primary);
    font-size: var(--font-size-xl);
    margin: 0;
}

.small-btn {
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--error);
}

.small-btn:hover:not(:disabled) {
    background: #dc2626;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-height: 200px;
    overflow-y: auto;
    padding: var(--spacing-sm);
}

.history-empty {
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    padding: var(--spacing-lg);
}

.history-item {
    background: linear-gradient(135deg, #f0f9ff, #e0f2fe);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-item:hover {
    transform: translateX(4px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    border-color: var(--accent);
}

.history-item-text {
    flex: 1;
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 500;
}

.history-item-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.history-item-btn {
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all 0.2s;
}

.history-item-btn:hover {
    background: #2563eb;
    transform: scale(1.05);
}

.history-item-btn.delete-btn {
    background: var(--error);
}

.history-item-btn.delete-btn:hover {
    background: #dc2626;
}

.history-item-date {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

/* ===================================
   Responsive Mobile Layout
   =================================== */

@media (max-width: 768px) {
    /* Stack sidebar below main content on mobile */
    .main-content {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    /* Make vocabulary sidebar full width on mobile */
    .vocabulary-sidebar {
        width: 100%;
        order: 2; /* Move to bottom */
        margin-top: var(--spacing-lg);
    }

    /* Content column appears first */
    .content-column {
        order: 1;
    }

    /* Adjust sentence display for mobile */
    .sentence-box {
        font-size: 1.5rem; /* Slightly smaller on mobile */
        padding: var(--spacing-lg);
        min-height: 100px;
    }

    /* Adjust header controls for mobile */
    .header-controls {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }

    .control-btn {
        font-size: var(--font-size-sm);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    /* Adjust semantic network canvas for mobile */
    #semantic-canvas {
        max-width: 100%;
        height: 400px;
    }

    /* Make word tiles grid responsive */
    .vocabulary-sidebar .word-tiles {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: var(--spacing-sm);
    }

    /* Adjust filter controls for mobile */
    .filter-controls {
        padding: var(--spacing-md);
    }

    .filter-group {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Adjust history list for mobile */
    .history-list {
        max-height: 300px;
    }

    .history-item {
        padding: var(--spacing-md);
    }

    .history-item-text {
        font-size: var(--font-size-sm);
    }
}

/* Tablet-specific adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
    .vocabulary-sidebar {
        width: 280px; /* Slightly narrower on tablets */
    }

    .main-content {
        padding: var(--spacing-lg);
    }
}