/* ===== CSS Custom Properties ===== */
:root {
    /* Light Theme Colors */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-editor: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* Accent Colors */
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --accent-light: rgba(99, 102, 241, 0.1);
    --accent-glow: rgba(99, 102, 241, 0.3);
    
    /* Semantic Colors */
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --error: #ef4444;
    --error-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    
    /* Code Syntax Colors (Light) */
    --syntax-keyword: #7c3aed;
    --syntax-string: #059669;
    --syntax-number: #0891b2;
    --syntax-comment: #64748b;
    --syntax-register: #dc2626;
    --syntax-label: #ea580c;
    --syntax-instruction: #2563eb;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    /* Spacing & Sizing */
    --header-height: 64px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-editor: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --border-hover: #475569;
    
    --accent-light: rgba(99, 102, 241, 0.15);
    --accent-glow: rgba(139, 92, 246, 0.4);
    
    /* Code Syntax Colors (Dark) */
    --syntax-keyword: #a78bfa;
    --syntax-string: #34d399;
    --syntax-number: #22d3ee;
    --syntax-comment: #64748b;
    --syntax-register: #f87171;
    --syntax-label: #fb923c;
    --syntax-instruction: #60a5fa;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* ===== Reset & Base Styles ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== App Container ===== */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    overflow: hidden;
}

.theme-toggle:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    transform: scale(1.05);
}

.theme-toggle svg {
    position: absolute;
    transition: all var(--transition-normal);
}

.theme-toggle .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

.theme-toggle .moon-icon {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .sun-icon {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* ===== Main Content ===== */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 24px 0;
    flex: 1;
}

/* ===== Editor Sections ===== */
.editor-section {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.editor-section:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--border-hover);
}

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

.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-icon {
    font-size: 1.2rem;
}

.section-title h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: inherit;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--accent-light);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Editor Wrapper */
.editor-wrapper {
    display: flex;
    flex: 1;
    min-height: 400px;
    max-height: 500px;
    overflow: hidden;
}

.line-numbers {
    width: 48px;
    padding: 16px 8px;
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-tertiary);
    text-align: right;
    user-select: none;
    overflow: hidden;
}

.code-editor,
.code-output {
    flex: 1;
    width: 100%;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    background: var(--bg-editor);
    color: var(--text-primary);
    border: none;
    outline: none;
    resize: none;
    overflow: auto;
}

.code-editor::placeholder {
    color: var(--text-tertiary);
}

.code-output {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.code-output .placeholder {
    color: var(--text-tertiary);
    font-style: italic;
}

/* Syntax Highlighting Classes */
.syntax-keyword { color: var(--syntax-keyword); font-weight: 500; }
.syntax-string { color: var(--syntax-string); }
.syntax-number { color: var(--syntax-number); }
.syntax-comment { color: var(--syntax-comment); font-style: italic; }
.syntax-register { color: var(--syntax-register); font-weight: 500; }
.syntax-label { color: var(--syntax-label); font-weight: 600; }
.syntax-instruction { color: var(--syntax-instruction); font-weight: 500; }

/* ===== Info Panel ===== */
.info-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding-bottom: 24px;
}

.info-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.info-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.register-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.register-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--accent-light);
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent-primary);
}

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

.register-item .arrow {
    color: var(--text-tertiary);
}

.register-item .reg-name {
    color: var(--syntax-register);
    font-weight: 600;
}

.placeholder-text {
    color: var(--text-tertiary);
    font-style: italic;
    font-family: 'Inter', sans-serif;
    background: none;
    padding: 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.feature-icon {
    color: var(--success);
    font-weight: bold;
}

/* ===== Register Assignment Section ===== */
.register-assignment-section {
    padding-bottom: 24px;
}

.assignment-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.assignment-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 12px;
}

.assignment-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
}

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

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.assignment-hint {
    font-size: 0.85rem;
    color: var(--text-tertiary);
    margin-bottom: 16px;
}

.variable-assignments {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    min-height: 60px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    border: 1px dashed var(--border-color);
}

.no-variables-message {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    width: 100%;
    justify-content: center;
    text-align: center;
}

.no-variables-message .icon {
    font-size: 1.5rem;
}

/* Variable Assignment Row */
.variable-assignment-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.variable-assignment-row:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.variable-assignment-row.assigned {
    border-color: var(--success);
    background: var(--success-bg);
}

.var-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 60px;
}

.assignment-arrow {
    color: var(--text-tertiary);
    font-size: 1rem;
}

.register-select {
    padding: 6px 12px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 500;
    background: var(--bg-editor);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 90px;
}

.register-select:hover {
    border-color: var(--accent-primary);
}

.register-select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.register-select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.register-select.selected {
    border-color: var(--success);
    color: var(--syntax-register);
}

/* Remove Variable Button */
.remove-var-btn {
    width: 24px;
    height: 24px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.remove-var-btn:hover {
    background: var(--error-bg);
    color: var(--error);
}

/* Auto-detect Toggle */
.auto-detect-toggle {
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    user-select: none;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--text-tertiary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle-label input:checked + .toggle-slider {
    background: var(--accent-light);
    border-color: var(--accent-primary);
}

.toggle-label input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: var(--accent-primary);
}

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

/* ===== Footer ===== */
.footer {
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 12px 24px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.toast.success {
    background: var(--success-bg);
    border-color: var(--success);
    color: var(--success);
}

.toast.error {
    background: var(--error-bg);
    border-color: var(--error);
    color: var(--error);
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .info-panel {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: 0 16px;
    }
    
    .logo h1 {
        font-size: 1.25rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .section-actions {
        width: 100%;
        display: flex;
        gap: 10px;
    }
    
    .btn {
        flex: 1;
        justify-content: center;
        padding: 12px; /* Larger touch target */
        font-size: 1rem;
    }
    
    .editor-wrapper {
        min-height: 250px; /* Reduced height to fit better on small screens */
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }

    .symbols-toolbar {
        padding: 12px;
        gap: 8px;
        justify-content: space-between;
    }

    .symbol-btn {
        min-width: 44px; /* Minimum accessible touch target size */
        height: 44px;
        font-size: 1rem;
        flex: 1;
    }

    .info-panel {
        gap: 16px;
    }

    .register-grid {
        gap: 6px;
    }

    .register-item {
        font-size: 0.75rem;
        padding: 4px 8px;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* ===== Selection ===== */
::selection {
    background: var(--accent-light);
    color: var(--accent-primary);
}

/* ===== Focus States ===== */
.code-editor:focus {
    box-shadow: inset 0 0 0 2px var(--accent-light);
}

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

/* ===== Error Styling ===== */
.error-output {
    color: var(--error);
    padding: 16px;
}

/* ===== PROFESSIONAL ANIMATIONS ===== */

/* Keyframe Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: var(--shadow-md);
    }
    50% {
        box-shadow: var(--shadow-glow);
    }
}

/* Page Load Animations */
.header {
    animation: fadeIn 0.6s ease-out;
}

.main-content {
    animation: fadeInUp 0.8s ease-out 0.1s backwards;
}

.input-section {
    animation: slideInLeft 0.8s ease-out 0.2s backwards;
}

.output-section {
    animation: slideInRight 0.8s ease-out 0.2s backwards;
}

.register-assignment-section {
    animation: fadeInUp 0.8s ease-out 0.3s backwards;
}

.info-panel {
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.footer {
    animation: fadeIn 0.8s ease-out 0.5s backwards;
}

/* Hover Animations */
.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    animation: pulse 1.5s ease-in-out infinite;
}

.btn-secondary:hover:not(:disabled) {
    transform: translateY(-1px);
}

.info-card {
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.assignment-card {
    transition: all 0.3s ease;
}

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

/* Feature Items Stagger Animation */
.feature-item {
    opacity: 0;
    animation: fadeIn 0.5s ease-out forwards;
}

.feature-item:nth-child(1) { animation-delay: 0.5s; }
.feature-item:nth-child(2) { animation-delay: 0.6s; }
.feature-item:nth-child(3) { animation-delay: 0.7s; }
.feature-item:nth-child(4) { animation-delay: 0.8s; }
.feature-item:nth-child(5) { animation-delay: 0.9s; }
.feature-item:nth-child(6) { animation-delay: 1s; }
.feature-item:nth-child(7) { animation-delay: 1.1s; }
.feature-item:nth-child(8) { animation-delay: 1.2s; }

/* Register Items Animation */
.register-item {
    animation: scaleIn 0.3s ease-out;
    transition: all 0.2s ease;
}

.register-item:hover {
    transform: scale(1.08);
    box-shadow: 0 2px 8px var(--accent-glow);
}

/* Variable Assignment Row Animation */
.variable-assignment-row {
    animation: scaleIn 0.4s ease-out;
}

.variable-assignment-row:hover {
    transform: translateX(4px);
}

/* Logo Animation */
.logo-icon svg {
    transition: transform 0.3s ease;
}

.logo:hover .logo-icon svg {
    transform: rotate(180deg);
}

.logo h1 {
    transition: all 0.3s ease;
}

.logo:hover h1 {
    transform: scale(1.02);
}

/* Editor Focus Animation */
.code-editor:focus {
    box-shadow: inset 0 0 0 2px var(--accent-light);
}

/* Button Click Animation */
.btn:active:not(:disabled) {
    transform: scale(0.98);
}



/* Toast Slide Animation */
.toast {
    animation: none;
}

.toast.show {
    animation: bounce 0.6s ease-out;
}

/* Loading State for Convert Button */
@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.btn-primary.loading svg {
    animation: rotate 1s linear infinite;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== MIPS Instructions List ===== */
.instructions-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.instruction-group h4 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-tertiary);
    margin-bottom: 8px;
}

.instruction-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.instruction-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--syntax-instruction);
    transition: all var(--transition-fast);
    cursor: default;
}

.instruction-tag:hover {
    background: var(--accent-light);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.instruction-note {
    margin-top: 12px;
    padding: 10px;
    background: var(--warning-bg, rgba(245, 158, 11, 0.1));
    border-left: 3px solid var(--warning);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== Symbols Toolbar ===== */
.symbols-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
}

.symbol-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    padding: 2px 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--syntax-instruction);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.symbol-btn:hover {
    background: var(--accent-light);
    border-color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.symbol-btn:active {
    transform: translateY(0);
    background: var(--accent-primary);
    color: white;
}