:root {
    /* Light Theme */
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-secondary-element: #fbbf24;
    --bg-tertiary: #f1f5f9;
    --bg-accent: #e2e8f0;

    --text-color: #1a202c;
    --text-secondary: #2d3748;
    /* Improved contrast from #4a5568 */
    --text-primary: #1a202c;
    --text-muted: #4a5568;
    /* Improved contrast from #718096 */

    --border-color: #e2e8f0;
    --border-hover: #cbd5e0;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    --primary-color: #0553d1;
    /* Improved from #a5a5a5 */
    --primary-dark: #1d4ed8;
    /* Improved from #d3d3d3 */
    --secondary-color: #6366f1;
    /* Improved from #764ba2 */
    --accent-color: #3b82f6;
    /* Improved from #667eea */
    --accent-primary: #3b82f6;
    --accent-secondary: #6366f1;
    --success-color: #059669;
    /* Improved from #48bb78 */
    --warning-color: #d97706;
    /* Improved from #ed8936 */
    --error-color: #dc2626;
    /* Improved from #e53e3e */
    --info-color: #036ca3;
    /* Improved from #4299e1 */
    --success: #059669;
    --warning: #d97706;
    --error: #c73535;
    --info: #0284c7;
    --bg-muted: #e2e8f0;
    --hover-bg: #f1f5f9;
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-secondary-element: #899ce7;
    --bg-tertiary: #334155;
    --bg-accent: #475569;

    --text-color: #f8fafc;
    --text-secondary: #e2e8f0;
    /* Improved contrast from #cbd5e0 */
    --text-primary: #f8fafc;
    --text-muted: #cbd5e0;
    /* Improved contrast from #94a3b8 */

    --border-color: #334155;
    --border-hover: #475569;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.4);

    --primary-color: #0553d1;
    /* Improved from #a5a5a5 */
    --primary-dark: #1d4ed8;
    /* Improved from #d3d3d3 */
    --secondary-color: #6366f1;
    /* Same as light for consistency */
    --accent-color: #3b82f6;
    --success-color: #10b981;
    /* Improved contrast for dark theme */
    --warning-color: #f59e0b;
    /* Improved contrast for dark theme */
    --error-color: #c73535;
    /* Improved contrast for dark theme */
    --info-color: #036ca3;
    /* Improved contrast for dark theme */
    --bg-muted: #475569;
    --hover-bg: #475569;
}

/* Global Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Base Styles */
body {
    font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    transition: all 0.3s ease;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.theme-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.theme-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-xl);
}

.theme-btn.theme-switching {
    animation: theme-switch 0.3s ease;
}

@keyframes theme-switch {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(0.9) rotate(180deg);
    }

    100% {
        transform: scale(1) rotate(360deg);
    }
}

/* Main App Layout */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--bg-primary);
}

/* Main content wrapper */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 16px;
    padding: 16px;
    min-height: 0;
}

/* Left Sidebar */
.sidebar {
    width: 320px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border-radius: 16px;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border-radius: 16px 16px 0 0;
}

/* Scrollable Sidebar Content */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 16px 0;
}

.sidebar-content::-webkit-scrollbar {
    width: 8px;
}

.sidebar-content::-webkit-scrollbar-track {
    background: var(--bg-accent);
    border-radius: 4px;
    margin: 8px;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Sidebar Cards - Fixed Height */
.sidebar-card {
    margin: 0 16px 16px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.sidebar-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-content {
    padding: 16px;
}

/* Remove scrollable class from cards */
.card-content .scrollable {
    max-height: none;
    overflow: visible;
}

.sum-card {
    padding: 15px;
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* Common Card Elements */
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.3rem;
    font-weight: 700;
}

.logo i {
    font-size: 1.5rem;
}

.version {
    font-size: 0.8rem;
    opacity: 0.8;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 8px;
    border-radius: 12px;
}

.card-header {
    padding: 16px 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-header i {
    color: var(--accent-primary);
}

.canvas-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.canvas-header i {
    color: var(--accent-primary);
}

.canvas-info {
    display: flex;
    gap: 20px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.info-item i {
    color: var(--accent-primary);
}

.gates-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.io-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.gate-item {
    cursor: grab;
    transition: all 0.2s ease;
}

.gate-item:active {
    cursor: grabbing;
    transform: scale(0.95);
}

.gate-preview {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 8px;
    text-align: center;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    min-height: 70px;
    justify-content: center;
}

.gate-preview:hover {
    border-color: var(--accent-primary);
    background: var(--accent-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.gate-preview i {
    font-size: 1.2rem;
    opacity: 0.8;
}

/* Gate Type Styles */
.and-gate {
    border-color: #ff9a9e;
}

.or-gate {
    border-color: #a18cd1;
}

.not-gate {
    border-color: #fad0c4;
}

.nand-gate {
    border-color: #ff9a9e;
    border-style: dashed;
}

.nor-gate {
    border-color: #a18cd1;
    border-style: dashed;
}

.xor-gate {
    border-color: #ffecd2;
}

.xnor-gate {
    border-color: #ffecd2;
    border-style: dashed;
}

.input-gate {
    border-color: #a8edea;
}

.output-gate {
    border-color: #d299c2;
}

/* Wire Colors */
.wire-colors {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 12px;
}

.color-preset {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.color-preset:hover,
.color-preset.selected {
    border-color: var(--accent-primary);
    transform: scale(1.15);
    box-shadow: var(--shadow-md);
}

#custom-wire-color {
    width: 100%;
    height: 40px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 8px;
    transition: border-color 0.2s ease;
}

#custom-wire-color:hover {
    border-color: var(--accent-primary);
}

.selected-color-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

#current-wire-color {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
}

/* Controls */
.controls {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 8px;
}

/* Accessibility Improvements */
.color-input-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
    margin-top: 8px;
}

/* Improved Button Styles for Accessibility */
.btn {
    padding: 12px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
    outline: none;
    min-height: 44px;
    /* WCAG 2.1 AA minimum touch target */
}

.btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn.small {
    padding: 8px 12px;
    font-size: 0.8rem;
    min-height: 36px;
}

.btn.primary {
    background: #1d4ed8;
    /* Higher contrast blue */
    color: white;
}

.btn.primary:hover {
    background: #1e40af;
}

.btn.secondary {
    background: #374151;
    /* Higher contrast gray */
    color: white;
}

.btn.secondary:hover {
    background: #4b5563;
}

.btn.accent {
    background: #dc2626;
    /* Higher contrast red */
    color: white;
}

.btn.accent:hover {
    background: #b91c1c;
}

.btn.success {
    background: #059669;
    /* Already good contrast */
    color: white;
}

.btn.success:hover {
    background: #047857;
}

.btn.info {
    background: #0284c7;
    /* Higher contrast blue */
    color: white;
}

.btn.info:hover {
    background: #0369a1;
}

/* Improve span text contrast in buttons */
.btn span {
    color: inherit;
    font-weight: inherit;
}

/* Main Canvas */
.main-canvas {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
}

.canvas-header {
    padding: 20px 24px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-radius: 16px 16px 0 0;
}

/* Mode Toggle */
.mode-toggle {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 4px;
    gap: 4px;
}

.mode-btn {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    min-height: 44px;
    /* WCAG 2.1 AA minimum touch target */
}

.mode-btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.mode-btn.active {
    background: #1d4ed8;
    /* Higher contrast blue */
    border-color: #1d4ed8;
    color: white;
    box-shadow: var(--shadow-sm);
}

.mode-btn:hover:not(.active) {
    background: var(--bg-accent);
    color: var(--text-primary);
    border-color: var(--border-hover);
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow: hidden;
}

/* Visual Mode */
.visual-mode {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Code Mode */
.code-mode {
    display: none;
    flex-direction: column;
    height: 100%;
    gap: 16px;
}

.code-mode.active {
    display: flex;
}

/* Verilog Code Editor */
.verilog-editor {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    min-height: 500px;
}

.editor-header {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.editor-header h4 {
    font-size: 0.9rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.editor-actions {
    display: flex;
    gap: 8px;
}

/* Editor Container with Line Numbers */
.editor-container {
    flex: 1;
    display: flex;
    position: relative;
}

.line-numbers {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: 16px 8px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    text-align: right;
    border-right: 1px solid var(--border-color);
    user-select: none;
    min-width: 50px;
    white-space: pre;
    overflow: hidden;
}

.editor-content {
    flex: 1;
    position: relative;
}

#verilog-input {
    width: 100%;
    height: 100%;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.85rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    padding: 16px;
    resize: none;
    outline: none;
    line-height: 1.5;
    tab-size: 4;
    white-space: pre;
    overflow-wrap: normal;
    overflow: auto;
}

#verilog-input::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

/* Auto-complete Popup */
.autocomplete-popup {
    position: absolute;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    max-height: 200px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.autocomplete-item {
    padding: 8px 12px;
    cursor: pointer;
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

.autocomplete-item:last-child {
    border-bottom: none;
}

.autocomplete-item:hover,
.autocomplete-item.selected {
    background: var(--accent-primary);
    color: white;
}

.autocomplete-item .keyword {
    color: var(--accent-primary);
    font-weight: bold;
}

.autocomplete-item .description {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: 8px;
}

/* Error Display - Terminal Style */
.error-display {
    background: var(--text-color);
    color: #d4d4d4;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.85rem;
    max-height: 200px;
    overflow-y: auto;
    margin-top: 12px;
    display: none;
    position: relative;
}

[data-theme="dark"] .error-display {
    background: #1e1e1e;
    border-color: #333;
}

.error-display.show {
    display: block;
}

.terminal-header {
    background: var(--bg-primary);
    padding: 8px 16px;
    border-bottom: 1px solid var(--bg-muted);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.8rem;
}

.terminal-title {
    color: #ffffff;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.terminal-controls {
    display: flex;
    gap: 6px;
}

.terminal-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
}

.terminal-btn.close {
    background: #ff5f56;
}

.terminal-btn.minimize {
    background: #ffbd2e;
}

.terminal-btn.maximize {
    background: #27ca3f;
}

.terminal-content {
    padding: 12px;
    min-height: 60px;
}

.error-item {
    margin-bottom: 8px;
    padding: 8px 12px;
    border-radius: 4px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease;
    line-height: 1.4;
}

.error-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.error-item.error {
    border-left: 3px solid #f14c4c;
    background: rgba(241, 76, 76, 0.1);
}

.error-item.warning {
    border-left: 3px solid #ffcc02;
    background: rgba(255, 204, 2, 0.1);
}

.error-item.success {
    border-left: 3px solid #23d160;
    background: rgba(35, 209, 96, 0.1);
}

.error-item i {
    margin-top: 2px;
    color: inherit;
}

.error-message {
    color: #d4d4d4;
    line-height: 1.4;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.85rem;
}

[data-theme="dark"] .error-message {
    color: #d4d4d4;
}

.error-details {
    color: #7f1d1d;
    font-size: 0.8rem;
    font-family: 'Fira Code', monospace;
}

[data-theme="dark"] .error-details {
    color: #dc2626;
}

/* Generation Status */
.generation-status {
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.status-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.status-info.success {
    color: var(--success);
}

/* Resizable Panels */
.code-mode {
    display: none;
    flex-direction: column;
    height: 100%;
    gap: 0;
}

.code-mode.active {
    display: flex;
}

.editor-panel {
    flex: 2;
    min-height: 300px;
    position: relative;
    display: flex;
    flex-direction: column;
}

.terminal-panel {
    flex: 1;
    min-height: 150px;
    max-height: 400px;
    position: relative;
}

.panel-divider {
    height: 4px;
    background: var(--border-color);
    cursor: ns-resize;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s ease;
}

.panel-divider:hover {
    background: var(--primary-color);
}

.panel-divider::after {
    content: '⋯';
    color: var(--text-secondary);
    font-size: 12px;
    letter-spacing: 2px;
}

.resize-handle {
    position: absolute;
    background: transparent;
    z-index: 10;
}

.resize-handle.horizontal {
    height: 4px;
    left: 0;
    right: 0;
    cursor: ns-resize;
}

.resize-handle.horizontal:hover {
    background: var(--primary-color);
}

.resize-handle.vertical {
    width: 4px;
    top: 0;
    bottom: 0;
    cursor: ew-resize;
}

.resize-handle.vertical:hover {
    background: var(--primary-color);
}

.status-info.error {
    color: var(--error);
}

.generate-btn {
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.generate-btn:hover {
    background: var(--accent-secondary);
    transform: translateY(-1px);
}

.generate-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.canvas-instructions {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.canvas-instructions i {
    color: var(--info);
    margin-right: 8px;
}

.canvas {
    flex: 1;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    position: relative;
    overflow: visible;
    /* Changed from hidden to visible */
    background-image:
        radial-gradient(circle, var(--border-color) 1px, transparent 1px);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
    transition: all 0.3s ease;
    min-height: 400px;
    /* Ensure minimum height */
}

.canvas.drag-over {
    border-color: var(--accent-primary);
    background-color: var(--bg-tertiary);
    background-image:
        radial-gradient(circle, var(--accent-primary) 1px, transparent 1px);
}

/* Right Sidebar - Results */
.results-sidebar {
    width: 350px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border-radius: 16px;
}

.results-header {
    padding: 20px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    border-radius: 16px 16px 0 0;
}

.results-header h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.results-header i {
    color: var(--accent-primary);
}

/* Scrollable Results Content */
.results-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 16px 0;
}

.results-content::-webkit-scrollbar {
    width: 8px;
}

.results-content::-webkit-scrollbar-track {
    background: var(--bg-accent);
    border-radius: 4px;
    margin: 8px;
}

.results-content::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.results-content::-webkit-scrollbar-thumb:hover {
    background: var(--accent-secondary);
}

/* Result Cards - Fixed Height */
.result-card {
    margin: 0 16px 16px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.result-card .card-header {
    padding: 14px 18px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.result-card .card-content {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Remove scrollable from result cards */
.result-card .scrollable {
    flex: 1;
    overflow: visible;
    max-height: none;
}

/* Empty States */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 12px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Input Controls */
.input-controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.input-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.input-toggle:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 24px;
    background: var(--border-color);
    border-radius: 24px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.toggle-switch.active {
    background: var(--success);
}

.toggle-slider {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.toggle-switch.active .toggle-slider {
    transform: translateX(26px);
}

.input-value-display {
    background: var(--bg-accent);
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

/* Truth Table Container */
.truth-table-container {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
}

.truth-table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 5px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    gap: 12px;
    flex-wrap: wrap;
    min-height: 60px;
}

.truth-table-title {
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.truth-table-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    min-height: 36px;
}

.truth-table-pagination {
    display: flex;
    gap: 8px;
    align-items: center;
    background: var(--bg-primary);
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.truth-table-nav-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    min-width: 60px;
    min-height: 32px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.truth-table-nav-btn:hover:not(:disabled) {
    background: var(--primary-dark);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.truth-table-nav-btn:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.truth-table-nav-btn:disabled {
    background: var(--bg-muted);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
}

.truth-table-nav-btn i {
    font-size: 0.75rem;
    opacity: 0.9;
}

.truth-table-info {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    min-height: 32px;
    display: flex;
    align-items: center;
}

.truth-table-select {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 100px;
    min-height: 32px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.truth-table-select:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.truth-table-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.truth-table-wrapper {
    overflow-x: auto;
    overflow-y: auto;
    max-height: 500px;
    position: relative;
    background: var(--bg-primary);
}

.truth-table-wrapper::-webkit-scrollbar {
    height: 12px;
    width: 12px;
}

.truth-table-wrapper::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.truth-table-wrapper::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 6px;
    border: 2px solid var(--bg-tertiary);
}

.truth-table-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Truth Table */
.truth-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-primary);
    margin: 0;
    min-width: 700px;
    font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
}

.truth-table th,
.truth-table td {
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    text-align: center;
    white-space: nowrap;
    min-width: 90px;
    font-weight: 500;
}

.truth-table th {
    background: var(--bg-tertiary);
    font-weight: 700;
    color: var(--text-primary);
    position: sticky;
    top: 0;
    z-index: 10;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.truth-table tr:nth-child(even) {
    background: var(--bg-secondary);
}

.truth-table tr:hover {
    background: var(--hover-bg);
    transform: scale(1.01);
    transition: all 0.2s ease;
}

.truth-table-footer {
    padding: 16px 24px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.truth-table-footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.truth-table-summary {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.truth-table-summary span {
    padding: 6px 12px;
    background: var(--bg-primary);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 0.8rem;
}

/* Truth Table Cell Styling for Better Accessibility */
.input-header {
    background: var(--input-header-bg, #0891b2) !important;
    color: var(--input-header-text, white) !important;
}

.logic-header {
    background: var(--logic-header-bg, #f59e0b) !important;
    color: var(--logic-header-text, white) !important;
}

.output-header {
    background: var(--output-header-bg, #059669) !important;
    color: var(--output-header-text, white) !important;
}

.input-cell-true {
    background: var(--input-true-bg, rgba(8, 145, 178, 0.15)) !important;
    color: var(--input-true-text, #0891b2) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--input-header-bg, #0891b2) !important;
}

.input-cell-false {
    background: var(--input-false-bg, rgba(239, 68, 68, 0.1)) !important;
    color: var(--input-false-text, #dc2626) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--input-false-border, #dc2626) !important;
}

.logic-cell-true {
    background: var(--logic-true-bg, rgba(245, 158, 11, 0.15)) !important;
    color: var(--logic-true-text, #f59e0b) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--logic-header-bg, #f59e0b) !important;
}

.logic-cell-false {
    background: var(--logic-false-bg, rgba(239, 68, 68, 0.1)) !important;
    color: var(--logic-false-text, #dc2626) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--logic-false-border, #dc2626) !important;
}

.output-cell-true {
    background: var(--output-true-bg, rgba(5, 150, 105, 0.15)) !important;
    color: var(--output-true-text, #059669) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--output-header-bg, #059669) !important;
}

.output-cell-false {
    background: var(--output-false-bg, rgba(239, 68, 68, 0.1)) !important;
    color: var(--output-false-text, #dc2626) !important;
    font-weight: 700 !important;
    border-left: 3px solid var(--output-false-border, #dc2626) !important;
}

/* Dark mode overrides for better contrast */
[data-theme="dark"] .input-header {
    --input-header-bg: #0ea5e9;
    --input-header-text: #0f172a;
}

[data-theme="dark"] .logic-header {
    --logic-header-bg: #fbbf24;
    --logic-header-text: #0f172a;
}

[data-theme="dark"] .output-header {
    --output-header-bg: #10b981;
    --output-header-text: #0f172a;
}

[data-theme="dark"] .input-cell-true {
    --input-true-bg: rgba(14, 165, 233, 0.25);
    --input-true-text: #38bdf8;
}

[data-theme="dark"] .input-cell-false {
    --input-false-bg: rgba(248, 113, 113, 0.2);
    --input-false-text: #f87171;
    --input-false-border: #f87171;
}

[data-theme="dark"] .logic-cell-true {
    --logic-true-bg: rgba(251, 191, 36, 0.25);
    --logic-true-text: #fbbf24;
}

[data-theme="dark"] .logic-cell-false {
    --logic-false-bg: rgba(248, 113, 113, 0.2);
    --logic-false-text: #f87171;
    --logic-false-border: #f87171;
}

[data-theme="dark"] .output-cell-true {
    --output-true-bg: rgba(16, 185, 129, 0.25);
    --output-true-text: #34d399;
}

[data-theme="dark"] .output-cell-false {
    --output-false-bg: rgba(248, 113, 113, 0.2);
    --output-false-text: #f87171;
    --output-false-border: #f87171;
}

/* Responsive improvements for mobile */
@media (max-width: 768px) {
    .truth-table-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .truth-table-controls {
        justify-content: space-between;
    }

    .truth-table-pagination {
        flex: 1;
        justify-content: center;
    }

    .truth-table-select {
        min-width: 100px;
    }

    .truth-table-nav-btn {
        min-width: 50px;
        padding: 6px 10px;
        font-size: 0.75rem;
    }

    .truth-table-footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .truth-table-summary {
        justify-content: center;
    }
}

.truth-table-wrapper::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.truth-table-wrapper::-webkit-scrollbar-corner {
    background: var(--bg-tertiary);
}

/* Truth Table */
.truth-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    background: var(--bg-secondary);
    margin: 0;
    min-width: 700px;
    /* Ensure minimum width for horizontal scrolling */
}

.truth-table th,
.truth-table td {
    border: 1px solid var(--border-color);
    padding: 12px 16px;
    text-align: center;
    white-space: nowrap;
    min-width: 100px;
    font-weight: 500;
}

.truth-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-primary);
    position: sticky;
    top: 0;
    z-index: 10;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.truth-table tr:nth-child(even) {
    background: rgba(74, 144, 226, 0.05);
}

.truth-table tr:hover {
    background: rgba(74, 144, 226, 0.1);
    transition: background-color 0.2s ease;
}

.truth-table-footer {
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.truth-table-footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.truth-table-summary {
    display: flex;
    gap: 20px;
    font-size: 0.85rem;
    flex-wrap: wrap;
}

.truth-table-summary span {
    background: var(--bg-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .truth-table-header {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
        padding: 16px;
    }

    .truth-table-controls {
        justify-content: center;
        flex-wrap: wrap;
    }

    .truth-table-pagination {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .truth-table-header {
        padding: 12px;
    }

    .truth-table-title {
        text-align: center;
        font-size: 1rem;
    }

    .truth-table-controls {
        flex-direction: column;
        gap: 8px;
    }

    .truth-table-nav-btn {
        padding: 8px 12px;
        font-size: 0.8rem;
        min-width: 70px;
    }

    .truth-table th,
    .truth-table td {
        padding: 8px 12px;
        min-width: 80px;
        font-size: 0.8rem;
    }

    .truth-table-footer {
        padding: 12px;
    }

    .truth-table-footer-content {
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }

    .truth-table-summary {
        justify-content: center;
        gap: 8px;
    }
}

/* Verilog Code */
#verilog-code {
    width: 100%;
    height: 150px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.8rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    resize: vertical;
    outline: none;
}

/* Gate Elements on Canvas */
.gate-element {
    position: absolute;
    background: var(--bg-secondary-element);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    cursor: move;
    user-select: none;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.gate-element:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.gate-element.selected {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.3);
}

.gate-element.simulating {
    animation: pulse 1s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

/* Connection Pins */
.pin {
    width: 16px;
    height: 16px;
    background: var(--border-color);
    border-radius: 50%;
    position: absolute;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 2px solid var(--bg-secondary);
    box-shadow: var(--shadow-sm);
}

.pin:hover {
    transform: scale(1.3);
    box-shadow: var(--shadow-md);
}

.pin.input {
    left: -8px;
}

.pin.output {
    right: -8px;
}

.pin.active {
    background: var(--accent-primary);
    box-shadow: 0 0 15px rgba(102, 126, 234, 0.6);
    transform: scale(1.4);
}

.pin-label {
    font-family: 'Fira Code', monospace;
    font-weight: bold;
    pointer-events: none;
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* Connection Wires */
.wire {
    position: absolute;
    stroke: var(--text-secondary);
    stroke-width: 2;
    fill: none;
    pointer-events: auto;
    cursor: pointer;
}

.wire-path {
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: all 0.3s ease;
    pointer-events: stroke;
}

.wire:hover .wire-path {
    stroke-width: 5 !important;
    filter: brightness(1.3) drop-shadow(0 0 10px currentColor);
}

/* Value Indicators */
.value-indicator {
    pointer-events: none;
    user-select: none;
    font-weight: bold;
    font-size: 0.9rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--bg-secondary);
    margin: 15% auto;
    padding: 30px;
    border-radius: 16px;
    width: 400px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

/* Loading Overlay */
#loading {
    display: none !important;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#loading.show {
    display: flex !important;
    opacity: 1;
}

.loading-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: white;
}

.loading-content i {
    font-size: 3rem;
    margin-bottom: 20px;
}

.loading-content p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 1400px) {
    .sidebar {
        width: 280px;
    }

    .results-sidebar {
        width: 300px;
    }
}

@media (max-width: 1200px) {
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        flex-direction: row;
        overflow-x: auto;
        overflow-y: hidden;
    }

    .sidebar-card {
        min-width: 250px;
        margin: 8px;
    }

    .results-sidebar {
        width: 100%;
        flex-direction: row;
        height: auto;
        overflow-x: auto;
        overflow-y: hidden;
    }

    .result-card {
        min-width: 300px;
    }
}

@media (max-width: 768px) {
    .theme-toggle {
        top: 10px;
        right: 10px;
    }

    .theme-btn {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .canvas-header {
        padding: 16px;
    }

    .canvas-header h2 {
        font-size: 1.2rem;
    }

    .canvas-info {
        flex-direction: column;
        gap: 8px;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Custom Animations */
.value-indicator {
    animation: bounceIn 0.3s ease;
}

@keyframes bounceIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }

    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Loading overlay for processing states */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(2px);
}

.loading-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.loading-content i {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.loading-content p {
    margin: 0;
    color: var(--text-color);
    font-weight: 500;
}

/* Ripple effect for buttons */
.btn {
    position: relative;
    overflow: hidden;
}

.ripple {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0);
    animation: ripple-animation 0.6s linear;
    pointer-events: none;
}

@keyframes ripple-animation {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Custom tooltip styling */
.custom-tooltip {
    position: absolute;
    background: var(--text-color);
    color: var(--bg-color);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
}

.custom-tooltip.visible {
    opacity: 1;
}

.custom-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-color);
}

/* Status bar for notifications */
.status-bar {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-weight: 500;
    z-index: 1000;
    display: none;
    max-width: 300px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.status-bar.info {
    background: var(--primary-color);
    color: white;
}

.status-bar.success {
    background: var(--success-color);
    color: white;
}

.status-bar.error {
    background: var(--error-color);
    color: white;
}

.status-bar.warning {
    background: var(--warning-color);
    color: white;
}

/* Auto-hide sidebar behavior */
.sidebar.auto-hide,
.results-sidebar.auto-hide {
    transition: transform 0.3s ease;
}

.sidebar.auto-hide:not(.expanded):not(:hover) {
    transform: translateX(-80%);
}

.results-sidebar.auto-hide:not(.expanded):not(:hover) {
    transform: translateX(80%);
}

/* Mobile responsive enhancements */
@media (max-width: 768px) {

    .sidebar.mobile,
    .results-sidebar.mobile {
        position: fixed;
        z-index: 100;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .results-sidebar.mobile {
        transform: translateX(100%);
    }

    .sidebar.mobile.expanded,
    .results-sidebar.mobile.expanded {
        transform: translateX(0);
    }

    .main-canvas {
        margin: 0;
        width: 100%;
    }

    .main-content {
        padding: 0.5rem;
        gap: 0.5rem;
    }

    .app-footer {
        padding: 12px 16px;
    }
}

/* Enhanced scrollbar for better UX */
.sidebar-content::-webkit-scrollbar,
.results-content::-webkit-scrollbar {
    width: 6px;
}

.sidebar-content::-webkit-scrollbar-track,
.results-content::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-content::-webkit-scrollbar-thumb,
.results-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
    transition: background-color 0.2s ease;
}

.sidebar-content::-webkit-scrollbar-thumb:hover,
.results-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Improved focus states for accessibility */
.btn:focus,
.verilog-editor:focus,
#verilog-input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Animation improvements */
.card-content,
.error-display,
.generation-status {
    transition: all 0.2s ease;
}

.error-item:hover {
    background: rgba(var(--error-color-rgb), 0.1);
    cursor: pointer;
}

/* Better visual hierarchy */
.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.sidebar h2,
.results-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
}

/* ===== ADAPTIVE TOOLTIP SYSTEM ===== */
/* Tooltip Base Styles */
[title] {
    position: relative;
}

[title]:hover::before,
[title]:hover::after {
    opacity: 1;
    visibility: visible;
    pointer-events: none;
}

[title]::before {
    content: attr(title);
    position: absolute;
    z-index: 9999;
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 500;
    line-height: 1.4;
    white-space: nowrap;
    max-width: 200px;
    word-wrap: break-word;
    white-space: normal;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
    transform: translateY(-5px);

    /* Default positioning - top */
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-5px);
}

[title]::after {
    content: "";
    position: absolute;
    z-index: 9998;
    width: 0;
    height: 0;
    border: 6px solid transparent;
    border-top-color: var(--bg-secondary);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;

    /* Default arrow - top */
    bottom: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%);
}

/* Tooltip positioning variants */
.tooltip-bottom[title]::before {
    top: calc(100% + 8px);
    bottom: auto;
}

.tooltip-bottom[title]::after {
    top: calc(100% + 2px);
    bottom: auto;
    border-top-color: transparent;
    border-bottom-color: var(--bg-secondary);
}

.tooltip-right[title]::before {
    left: calc(100% + 8px);
    right: auto;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%) translateX(5px);
}

.tooltip-right[title]::after {
    left: calc(100% + 2px);
    right: auto;
    top: 50%;
    bottom: auto;
    transform: translateY(-50%);
    border-top-color: transparent;
    border-right-color: var(--bg-secondary);
}

/* Responsive tooltip positioning */
@media (max-width: 768px) {
    [title]::before {
        max-width: 150px;
        font-size: 0.75rem;
        padding: 6px 10px;
    }

    /* Force bottom positioning on small screens */
    [title]::before {
        top: calc(100% + 8px);
        bottom: auto;
        left: 50%;
        right: auto;
        transform: translateX(-50%) translateY(5px);
    }

    [title]::after {
        top: calc(100% + 2px);
        bottom: auto;
        left: 50%;
        right: auto;
        transform: translateX(-50%);
        border-top-color: transparent;
        border-bottom-color: var(--bg-secondary);
    }
}

/* Prevent tooltip overflow */
[title]::before {
    /* Adaptive positioning to prevent overflow */
    max-width: min(200px, calc(100vw - 32px));
}

/* Enhanced contrast for accessibility */
[data-theme="light"] [title]::before {
    background: var(--card-bg);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

[data-theme="light"] [title]::after {
    border-top-color: var(--card-bg);
}

[data-theme="light"] .tooltip-bottom[title]::after {
    border-bottom-color: var(--card-bg);
    border-top-color: transparent;
}

[data-theme="light"] .tooltip-left[title]::after {
    border-left-color: var(--card-bg);
    border-top-color: transparent;
}

[data-theme="light"] .tooltip-right[title]::after {
    border-right-color: var(--card-bg);
    border-top-color: transparent;
}

/* Dark theme tooltips - high contrast */
[data-theme="dark"] [title]::before {
    background: #1f2937 !important;
    color: #f9fafb !important;
    border: 1px solid #4b5563 !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5) !important;
}

[data-theme="dark"] [title]::after {
    border-top-color: #1f2937 !important;
}

[data-theme="dark"] .tooltip-bottom[title]::after {
    border-bottom-color: #1f2937 !important;
    border-top-color: transparent !important;
}

[data-theme="dark"] .tooltip-left[title]::after {
    border-left-color: #1f2937 !important;
    border-top-color: transparent !important;
}

[data-theme="dark"] .tooltip-right[title]::after {
    border-right-color: #1f2937 !important;
    border-top-color: transparent !important;
}

/* Tooltip positioning variants */
.tooltip-top[title]::before {
    bottom: calc(100% + 8px);
    top: auto;
    left: 50%;
    right: auto;
    transform: translateX(-50%) translateY(-5px);
}

.tooltip-top[title]::after {
    bottom: calc(100% + 2px);
    top: auto;
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    border-bottom-color: transparent;
    border-top-color: var(--bg-secondary);
}

[data-theme="dark"] .tooltip-top[title]::after {
    border-top-color: #1f2937 !important;
    border-bottom-color: transparent !important;
}

/* ===== ADAPTIVE TOOLTIP SYSTEM ===== */
/* Remove all default tooltip behaviors that might conflict */
.custom-tooltip,
.tooltip,
[title]:not([data-tooltip])::before,
[title]:not([data-tooltip])::after {
    display: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

/* Enhanced adaptive tooltip styling with better contrast */
.adaptive-tooltip {
    position: fixed !important;
    z-index: 10000 !important;
    background: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    padding: 10px 14px !important;
    border-radius: 8px !important;
    font-size: 0.8rem !important;
    font-weight: 500 !important;
    line-height: 1.4 !important;
    max-width: 220px !important;
    word-wrap: break-word !important;
    white-space: normal !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25) !important;
    border: 1px solid var(--border-color) !important;
    font-family: Inter, sans-serif !important;
    pointer-events: none !important;
}

.tooltip-arrow {
    position: absolute !important;
    width: 10px !important;
    height: 10px !important;
    background: var(--bg-secondary) !important;
    border: 1px solid var(--border-color) !important;
    transform: rotate(45deg) !important;
}

/* Dark theme tooltip support - High contrast fix */
[data-theme="dark"] .adaptive-tooltip {
    background: #374151 !important;
    color: #f9fafb !important;
    border-color: #6b7280 !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6) !important;
}

[data-theme="dark"] .tooltip-arrow {
    background: #374151 !important;
    border-color: #6b7280 !important;
}

/* Light theme tooltip for consistency */
[data-theme="light"] .adaptive-tooltip {
    background: #ffffff !important;
    color: #1f2937 !important;
    border-color: #d1d5db !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15) !important;
}

[data-theme="light"] .tooltip-arrow {
    background: #ffffff !important;
    border-color: #d1d5db !important;
}

/* Tour system styling */
.tour-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(0, 0, 0, 0.4) !important;
    z-index: 9998 !important;
    backdrop-filter: blur(2px) !important;
}

.tour-highlight {
    position: fixed !important;
    background: transparent !important;
    border: 3px solid var(--primary-color) !important;
    border-radius: 8px !important;
    z-index: 9999 !important;
    pointer-events: none !important;
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3) !important;
    animation: tour-pulse 2s infinite !important;
}

.tour-box {
    position: fixed !important;
    background: var(--bg-primary) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 12px !important;
    padding: 20px !important;
    max-width: 320px !important;
    min-width: 280px !important;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15) !important;
    z-index: 10000 !important;
    font-family: Inter, sans-serif !important;
}

.tour-btn {
    border: none !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    font-size: 0.85rem !important;
    padding: 8px 16px !important;
    transition: all 0.2s ease !important;
    font-family: inherit !important;
}

.tour-btn:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
}

@keyframes tour-pulse {

    0%,
    100% {
        box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3);
    }

    50% {
        box-shadow: 0 0 0 8px rgba(59, 130, 246, 0.1);
    }
}

/* Tour controls styling */
.tour-controls {
    margin-top: 16px !important;
    padding-top: 16px !important;
    border-top: 1px solid var(--border-color) !important;
}

/* ===== IMPROVED BUTTON CONTRAST ===== */
.btn.primary {
    background: var(--primary-color);
    /* Now #2563eb */
    color: #ffffff;
    font-weight: 600;
}

.btn.primary:hover {
    background: var(--primary-dark);
    /* Now #1d4ed8 */
}

.btn.secondary {
    background: #6b7280;
    /* Darker gray for better contrast */
    color: #ffffff;
    font-weight: 600;
}

.btn.secondary:hover {
    background: #4b5563;
}

.btn.accent {
    background: var(--error-color);
    /* Now #dc2626 */
    color: #ffffff;
    font-weight: 600;
}

.btn.accent:hover {
    background: #b91c1c;
}

.btn.info {
    background: var(--info-color);
    /* Now #0284c7 */
    color: #ffffff;
    font-weight: 600;
}

.btn.info:hover {
    background: #0369a1;
}

.btn.success {
    background: var(--success-color);
    /* Now #059669 */
    color: #ffffff;
    font-weight: 600;
}

.btn.success:hover {
    background: #047857;
}

/* Mode button contrast improvements */
.mode-btn.active {
    background: var(--primary-color);
    /* Now #2563eb */
    color: #ffffff;
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

/* Result card contrast improvements */
.result-card {
    margin: 0 16px 16px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.result-card p {
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.result-card h3,
.result-card h4 {
    color: var(--text-primary);
    font-weight: 600;
}

/* Dark theme specific improvements */
[data-theme="dark"] .btn.primary {
    background: var(--primary-color);
    /* #3b82f6 in dark theme */
    color: #ffffff;
}

[data-theme="dark"] .btn.primary:hover {
    background: var(--primary-dark);
    /* #2563eb in dark theme */
}

[data-theme="dark"] .btn.secondary {
    background: #64748b;
    /* Lighter in dark theme for better contrast */
    color: #ffffff;
}

[data-theme="dark"] .btn.secondary:hover {
    background: #475569;
}

[data-theme="dark"] .btn.accent {
    background: var(--error-color);
    /* #ef4444 in dark theme */
    color: #ffffff;
}

[data-theme="dark"] .btn.accent:hover {
    background: #dc2626;
}

[data-theme="dark"] .btn.info {
    background: var(--info-color);
    /* #06b6d4 in dark theme */
    color: #ffffff;
}

[data-theme="dark"] .btn.info:hover {
    background: #0891b2;
}

[data-theme="dark"] .btn.success {
    background: var(--success-color);
    /* #10b981 in dark theme */
    color: #ffffff;
}

[data-theme="dark"] .btn.success:hover {
    background: #059669;
}

[data-theme="dark"] .mode-btn.active {
    background: #0553d1;
    /* Brighter blue for dark theme */
    border-color: #3b82f6;
    color: white;
}

[data-theme="dark"] .result-card p {
    color: var(--text-primary);
    /* #f8fafc in dark theme */
    font-weight: 500;
}

[data-theme="dark"] .result-card h3,
[data-theme="dark"] .result-card h4 {
    color: var(--text-primary);
    font-weight: 600;
}

/* ===== ENHANCED TEXT CONTRAST ===== */
/* Ensure all text elements meet WCAG AA contrast requirements */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-primary);
    font-weight: 600;
}

p,
span,
div {
    color: var(--text-primary);
}

.text-secondary {
    color: var(--text-secondary);
}

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

/* Button span elements specifically */
.btn span {
    color: inherit;
    /* Inherit from parent button */
    font-weight: 600;
}

/* Sidebar text improvements */
.sidebar-header .logo span {
    color: var(--text-primary);
    font-weight: 700;
}

.sidebar-header .version {
    color: var(--text-secondary);
    font-weight: 500;
}

.card-header h3 {
    color: var(--text-primary);
    font-weight: 600;
}

/* Gate preview text */
.gate-preview span {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.8rem;
}

/* Canvas header text */
.canvas-header h2 {
    color: var(--text-primary);
    font-weight: 600;
}

/* Truth table improvements */
.truth-table th {
    color: var(--text-primary);
    font-weight: 600;
}

.truth-table td {
    color: var(--text-primary);
    font-weight: 500;
}

/* Navigation button text */
.truth-table-nav-btn {
    color: var(--text-primary);
    font-weight: 600;
}

.truth-table-nav-btn:disabled {
    color: var(--text-muted);
}

/* Input controls text */
.input-toggle span {
    color: var(--text-primary);
    font-weight: 600;
}

/* Terminal text */
.terminal-title {
    color: var(--text-primary);
    font-weight: 600;
}

/* Statistics text */
.stats-item span {
    color: var(--text-primary);
    font-weight: 500;
}

.stats-item .stats-number {
    color: var(--primary-color);
    font-weight: 700;
}

/* Performance optimizations */
.autocomplete-popup,
.loading-overlay {
    will-change: transform, opacity;
}

.ripple {
    will-change: transform, opacity;
}

/* ===== FOOTER STYLES ===== */
.app-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 16px 24px;
    margin-top: auto;
    flex-shrink: 0;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 100%;
    gap: 16px;
}

.copyright {
    color: var(--text-muted);
    font-size: 14px;
}

.github-link a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-size: 14px;
    font-weight: 500;
}

.github-link a:hover {
    background: var(--hover-bg);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.github-link a i {
    font-size: 18px;
}

.version-info {
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 500;
    background: var(--bg-muted);
    padding: 4px 8px;
    border-radius: 12px;
}

/* Responsive footer */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .copyright {
        font-size: 12px;
    }

    .github-link a {
        font-size: 13px;
    }

    .version-info {
        font-size: 11px;
    }
}

/* Dark theme footer styling */
[data-theme="dark"] .app-footer {
    background: var(--bg-secondary);
    border-top-color: var(--border-color);
}

[data-theme="dark"] .copyright {
    color: var(--text-muted);
}

[data-theme="dark"] .github-link a {
    color: var(--text-secondary);
}

[data-theme="dark"] .github-link a:hover {
    color: var(--primary-color);
    background: var(--hover-bg);
}