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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #475569;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-lg: rgba(0, 0, 0, 0.5);
    
    /* Gate color families */
    --gate-x-color: #ef4444;      /* Red - X family (X, CX, RX) */
    --gate-x-dark: #dc2626;
    --gate-y-color: #22c55e;      /* Green - Y family (Y, CY, RY) */
    --gate-y-dark: #16a34a;
    --gate-z-color: #3b82f6;      /* Blue - Z family (Z, CZ, RZ) */
    --gate-z-dark: #2563eb;
    --gate-h-color: #a855f7;      /* Purple - Hadamard */
    --gate-h-dark: #9333ea;
    --gate-phase-color: #06b6d4;  /* Cyan - Phase gates (S, T) */
    --gate-phase-dark: #0891b2;
    --gate-swap-color: #f97316;   /* Orange - SWAP */
    --gate-swap-dark: #ea580c;
    --gate-measure-color: #10b981; /* Green - Measurement */
    --gate-measure-dark: #059669;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }
    
    .sidebar, .code-sidebar {
        width: 100%;
        max-height: 300px;
        border-right: none;
        border-left: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .header-controls {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .circuit-controls {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
    
    .playback-controls {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .large-modal {
        min-width: 90vw;
        max-width: 90vw;
    }
}

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

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px var(--shadow);
}

.title-section {
    display: flex;
    align-items: center;
}

.title {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    height: 40px;
    margin-right: 1rem;
}

.quantum-icon {
    font-size: 2rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.header-controls {
    display: flex;
    gap: 0.75rem;
}

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--surface-light);
    color: var(--text-primary);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-primary.has-error {
    background: var(--danger);
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-primary.has-error:hover {
    background: var(--danger);
    opacity: 0.7;
}

.btn-secondary {
    background: var(--surface-light);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--surface);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1.5rem;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.sidebar-header-buttons {
    display: flex;
    gap: 0.5rem;
}

.sidebar-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    white-space: nowrap;
}

.gate-palette {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.gate-category {
    margin-bottom: 1rem;
}

.category-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.gate-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Circuit Area */
.circuit-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--background);
    overflow: hidden;
    position: relative;
}

.main-editor-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.visualization-section {
    flex: 0 0 35%;
    min-height: 250px;
    max-height: 400px;
    background: var(--surface);
    border-top: 2px solid var(--border-color);
    padding: 1rem;
    display: flex;
    gap: 1rem;
    overflow: hidden;
    position: relative;
    transition: flex 0.3s ease, min-height 0.3s ease, max-height 0.3s ease, padding 0.3s ease;
}

.visualization-section.collapsed {
    flex: 0 0 0;
    min-height: 0;
    max-height: 0;
    padding: 0;
    overflow: visible;
    border-top: 2px solid var(--border-color);
}

.visualization-section.collapsed > * {
    display: none;
}

.viz-section-toggle {
    position: absolute;
    bottom: 35%;
    left: 50%;
    transform: translateX(-50%) translateY(2px);
    width: 60px;
    height: 26px;
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-bottom: none;
    border-radius: 0.5rem 0.5rem 0 0;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 0;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.2);
    transition: bottom 0.3s ease, transform 0.3s ease, border-radius 0.3s ease, border 0.3s ease;
    overflow: visible;
}

.visualization-section.collapsed ~ .viz-section-toggle {
    bottom: 0;
    transform: translateX(-50%) translateY(-100%);
    border-bottom: 2px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 0.5rem 0.5rem;
}

.visualization-section.collapsed ~ .viz-section-toggle .toggle-icon {
    transform: rotate(180deg);
}

.viz-section-toggle:hover {
    background: var(--surface-light);
    border-color: var(--primary-color);
}

.viz-section-toggle .toggle-icon {
    font-size: 0.75rem;
    transition: transform 0.3s ease;
    display: block;
}

.viz-region {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
    min-width: 0;
}

.viz-tabs {
    display: flex;
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
}

.viz-tabs-scrollable-wrapper {
    display: flex;
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    position: relative;
    align-items: center;
}

.viz-tabs-scrollable {
    flex: 1;
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.viz-tabs-scrollable::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.viz-tabs-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 100%;
    background: var(--surface);
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    z-index: 1;
    padding: 0;
    flex-shrink: 0;
}

.viz-tabs-arrow:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

.viz-tabs-arrow-left {
    border-right: 1px solid var(--border-color);
}

.viz-tabs-arrow-right {
    border-left: 1px solid var(--border-color);
}

.viz-tab-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

/* Regular tabs (in .viz-tabs) flex to fill space */
.viz-tabs > .viz-tab-btn {
    flex: 1;
}

/* Scrollable tabs don't flex */
.viz-tabs-scrollable > .viz-tab-btn {
    flex: 0 0 auto;
}

.viz-tab-btn:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

.viz-tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--background);
}

.viz-panel {
    display: none;
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    min-height: 0;
    position: relative;
}

.viz-panel.active {
    display: flex;
    flex-direction: column;
}

.viz-panel .results-display,
.viz-panel .state-vector {
    flex: 1;
    min-height: 0;
}

.editor-tabs {
    display: flex;
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: var(--surface-light);
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--background);
}

.editor-panel {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.editor-panel.active {
    display: flex;
}

/* NMR and Resources wrappers */
.nmr-simulator-wrapper,
.resources-wrapper {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.nmr-error {
    padding: 1.5rem;
    color: var(--error-color, #ef4444);
    text-align: center;
}

.circuit-controls {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.qubit-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.input-number {
    width: 60px;
    padding: 0.375rem 0.5rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.qubit-count-input {
    width: 100px;
    text-align: center;
}

.input-number:focus {
    outline: none;
    border-color: var(--primary-color);
}

.circuit-info {
    display: flex;
    gap: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 1rem;
    border-left: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
}

.zoom-controls span {
    font-size: 0.875rem;
    min-width: 40px;
    text-align: center;
}

.selection-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    background: var(--background);
    border-radius: 0.25rem;
}

.playback-controls {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.playback-controls label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-left: 0.5rem;
}

.input-select {
    padding: 0.375rem 0.5rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
}

.input-select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Editor panel styles are defined above with tabs */

.editor-panel .circuit-canvas-wrapper {
    flex: 1;
    min-height: 0;
}

.editor-toolbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    display: flex;
    gap: 0.5rem;
}

/* Code Editor with Syntax Highlighting */
.code-editor-container {
    flex: 1;
    display: flex;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    overflow: hidden;
    min-height: 200px;
    position: relative;
    margin: 0 1rem 1rem 1rem;
}

.line-numbers {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    background: var(--surface);
    color: var(--text-secondary);
    padding: 1rem 0.5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--border-color);
    min-width: 40px;
    width: 50px;
    overflow: hidden;
    z-index: 2;
    box-sizing: border-box;
}

.line-numbers .line-num {
    display: block;
    padding-right: 0.5rem;
}

.line-numbers .line-num.error {
    color: var(--danger);
    font-weight: bold;
    position: relative;
    cursor: help;
}

.line-numbers .line-num.error::after {
    content: '✗';
    position: absolute;
    right: -2px;
    font-size: 0.65rem;
}

/* Native tooltip styling via title attribute - enhanced with CSS */
.line-numbers .line-num[title],
.line-error[title] {
    cursor: help;
}

.code-editor-wrapper {
    flex: 1;
    position: relative;
    overflow-x: auto;
    overflow-y: auto;
    min-height: 300px;
    margin-left: 50px; /* Space for line numbers */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.code-editor-wrapper::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

.code-highlight,
.code-editor {
    margin: 0;
    padding: 1rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre;
    word-wrap: normal;
    overflow-wrap: normal;
    tab-size: 4;
    -moz-tab-size: 4;
    letter-spacing: normal;
    word-spacing: normal;
    border: none;
    box-sizing: border-box;
}

.code-highlight {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: transparent;
    overflow: hidden;
    z-index: 0;
    color: var(--text-primary); /* Default text color for immediate visibility */
}

.code-editor {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    min-height: 300px;
    background: transparent;
    color: transparent;
    caret-color: var(--text-primary);
    resize: none;
    outline: none;
    z-index: 1;
    overflow: hidden;
}

.code-editor::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.code-editor:focus::placeholder {
    opacity: 0.3;
}

/* Syntax highlighting token colors */
.token-default {
    color: var(--text-primary);
}

.token-comment {
    color: #96addb;
    font-style: italic;
}

.token-gate {
    color: #c084fc;
    font-weight: 600;
}

.token-keyword {
    color: #9295ff;
    font-weight: 600;
}

.token-number {
    color: #fbbf24;
}

/* Qubit targets in parentheses (0,1,2) */
.token-target-qubits {
    color: #60a5fa;
}

/* Control qubits in brackets [0,1,2] */
.token-control-qubits {
    color: #63d4b6;
}

.token-invalid {
    color: #ef4444;
    text-decoration: wavy underline;
    text-decoration-color: #ef4444;
}

.line-error {
    background: rgba(239, 68, 68, 0.12);
    display: inline;
    border-radius: 2px;
    padding: 1px 0;
}

/* Syntax error tooltip */
.syntax-error-tooltip {
    position: fixed;
    background: #1e1e2e;
    color: #ef4444;
    border: 1px solid #ef4444;
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 0.8rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    max-width: 400px;
    z-index: 10000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    pointer-events: none;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.syntax-error-tooltip::before {
    content: '⚠ ';
}

.error-display {
    background: rgba(239, 68, 68, 0.1);
    border-top: 1px solid var(--danger);
    padding: 0.75rem 1rem;
    color: var(--danger);
    font-size: 0.875rem;
    font-family: 'Courier New', monospace;
    display: none;
    margin: 0 1rem 1rem 1rem;
    border-radius: 0 0 0.375rem 0.375rem;
}

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

.target-qubit-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
    max-height: 300px;
    overflow-y: auto;
}

.target-qubit-item {
    padding: 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.target-qubit-item:hover {
    background: var(--border-color);
    border-color: var(--primary-color);
}

.target-qubit-item.selected {
    background: var(--primary-color);
    border-color: var(--primary-dark);
    color: white;
}

.circuit-canvas-wrapper {
    flex: 1;
    overflow: auto;
    position: relative;
    min-height: 400px;
}

.circuit-canvas {
    padding: 2rem;
    position: relative;
    min-height: 400px;
    display: inline-block;
}

.step-timeline {
    background: var(--surface);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    flex-wrap: nowrap;
}

.step-item {
    min-width: 80px;
    padding: 0.75rem;
    background: var(--surface-light);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    flex-shrink: 0;
}

.step-item:hover {
    border-color: var(--primary-color);
    background: var(--border-color);
}

.step-item.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.step-item-number {
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.step-item-gates {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.step-item.active .step-item-gates {
    color: rgba(255, 255, 255, 0.8);
}

/* Code Sidebar (Right) */
.code-sidebar {
    width: 400px;
    background: var(--surface);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.code-sidebar .sidebar-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.code-sidebar .sidebar-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.code-sidebar .editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
    padding: 0;
}

.code-sidebar .editor-toolbar {
    margin: 0 1rem;
    border-radius: 0.375rem 0.375rem 0 0;
}

.qubit-visualization {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.probability-graphs {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
}

.sticky-results {
    position: sticky;
    top: 0;
    background: var(--surface);
    z-index: 10;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}


.graph-container {
    padding: 0;
}

.graph-view-toggle {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.graph-view-toggle button {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.graph-view-toggle button.active {
    background: var(--primary-color);
    color: white;
}

.large-modal {
    min-width: 600px;
    max-width: 800px;
}

.algorithms-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
    max-height: 500px;
    overflow-y: auto;
}

.algorithm-item {
    padding: 1rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.algorithm-item:hover {
    background: var(--border-color);
    border-color: var(--primary-color);
}

.algorithm-item h4 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.algorithm-item p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 0;
}

.algorithm-options {
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.checkbox-label:hover {
    color: var(--text-primary);
}

.algorithm-params {
    margin: 1.5rem 0;
    padding: 1rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
}

.algorithm-params h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.settings-content {
    margin: 1rem 0;
}

.settings-section {
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--surface-light);
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.settings-section-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 1rem 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.setting-item label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.setting-item .input-number,
.setting-item .input-select {
    padding: 0.5rem 0.75rem;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.setting-item .input-number:focus,
.setting-item .input-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.setting-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.input-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.settings-toggles {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toggle-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    background: var(--background);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background 0.2s ease;
}

.toggle-item:hover {
    background: var(--border-color);
}

.toggle-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
    flex-shrink: 0;
}

.toggle-label {
    font-size: 0.875rem;
    color: var(--text-primary);
}

/* Legacy parameter-group support */
.settings-content .parameter-group {
    margin-bottom: 1.5rem;
}

.settings-content input[type="checkbox"] {
    width: auto;
    margin-left: 0.5rem;
}

.gate-info-content {
    font-size: 0.875rem;
    line-height: 1.6;
}

.gate-info-content h4 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.gate-info-content .matrix {
    font-family: 'Courier New', monospace;
    background: var(--background);
    padding: 1rem;
    border-radius: 0.375rem;
    margin: 0.5rem 0;
    overflow-x: auto;
    display: flex;
    justify-content: center;
}

.matrix-table {
    border-collapse: collapse;
    margin: 0 auto;
}

.matrix-table td {
    padding: 0.5rem 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
    font-size: 0.875rem;
}

.matrix-text {
    text-align: center;
    font-size: 0.875rem;
}

.gate-info-content .description {
    color: var(--text-secondary);
    margin: 0.5rem 0;
}

.delete-gate-hint {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--danger);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.gate-on-wire:hover .delete-gate-hint {
    opacity: 1;
}

/* Styles for state vector and measurement results now in viz-panel */
.viz-panel h3 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.state-vector {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 1px solid var(--primary-color);
    border-radius: 0.5rem;
    padding: 1rem;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    overflow-y: auto;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    position: relative;
    flex: 1;
    min-height: 0;
}

.state-vector::before {
    content: '|ψ⟩ =';
    display: block;
    font-size: 0.75rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* State vector term styling */
.sv-coeff {
    color: var(--text-secondary);
    font-weight: 500;
}

.sv-imag {
    color: var(--secondary-color);
    font-style: italic;
}

.sv-ket {
    color: var(--primary-color);
    font-weight: 600;
    background: rgba(99, 102, 241, 0.15);
    padding: 0.15rem 0.4rem;
    border-radius: 0.25rem;
    margin: 0 0.1rem;
}

.sv-plus {
    color: var(--text-secondary);
    padding: 0 0.25rem;
}

.results-display {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 0;
    min-height: 0;
    flex: 1;
    overflow-y: auto;
}

.placeholder {
    color: var(--text-secondary);
    font-style: italic;
    text-align: center;
    padding: 1rem;
    margin: auto;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    min-width: 300px;
    box-shadow: 0 10px 40px var(--shadow-lg);
}

.modal-content h3 {
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.modal-buttons {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
    justify-content: flex-end;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--surface-light);
}