/* ===================================
   DSA VISUALIZER INFINITY - STYLES
   Professional-Grade CSS Architecture
   =================================== */

/* === CSS Variables & Theme System === */
:root {
    --navbar-height: 76px;

    /* Dark Theme Colors */
    --bg-primary: #0b1220;
    --bg-secondary: #141f34;
    --bg-tertiary: #23324f;
    --surface: #111c30;
    --surface-glass: rgba(17, 28, 48, 0.76);
    --surface-raised: #182744;
    --panel-accent: rgba(14, 165, 233, 0.22);
    --ambient-halo: rgba(14, 165, 233, 0.18);
    --accent-halo: rgba(14, 165, 233, 0.17);
    --accent-halo-light: rgba(14, 165, 233, 0.12);
    
    /* Accent Colors */
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --primary-light: rgba(14, 165, 233, 0.14);
    
    --success: #22c55e;
    --success-light: rgba(34, 197, 94, 0.1);
    
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);
    
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.1);
    
    --info: #06b6d4;
    --info-light: rgba(6, 182, 212, 0.1);
    
    /* Text Colors */
    --text-primary: #e2e8f0;
    --text-secondary: #9fb0c9;
    --text-muted: #64748b;
    
    /* Border & Dividers */
    --border-color: rgba(148, 163, 184, 0.22);
    --divider-color: rgba(148, 163, 184, 0.12);
    
    /* Shadows & Effects */
    --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.35);
    --shadow-md: 0 10px 20px rgba(2, 6, 23, 0.35);
    --shadow-lg: 0 18px 32px rgba(2, 6, 23, 0.38);
    --shadow-xl: 0 24px 48px rgba(2, 6, 23, 0.45);
    
    /* Spacing System (8px base) */
    --space-1: 8px;
    --space-2: 16px;
    --space-3: 24px;
    --space-4: 32px;
    --space-5: 40px;
    --space-6: 48px;
    
    /* Typography */
    --font-sans: 'Avenir Next', 'Segoe UI Variable', 'Segoe UI', 'Trebuchet MS', Tahoma, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Visualization Colors */
    --viz-default: var(--primary);
    --viz-compare: #fbbf24;
    --viz-swap: var(--danger);
    --viz-sorted: var(--success);
    --viz-current: #f97316;
    --viz-pivot: #14b8a6;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #edf3fa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #d4e1ee;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.88);
    --surface-raised: #f6faff;
    --panel-accent: rgba(3, 105, 161, 0.18);
    --ambient-halo: rgba(14, 116, 144, 0.12);
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --border-color: rgba(15, 23, 42, 0.12);
    --divider-color: rgba(15, 23, 42, 0.08);
    
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 10px 20px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 16px 30px rgba(15, 23, 42, 0.1);
    --shadow-xl: 0 22px 40px rgba(15, 23, 42, 0.14);
}

[data-category-accent="sorting"] {
    --primary: #0ea5e9;
    --primary-hover: #0284c7;
    --primary-light: rgba(14, 165, 233, 0.14);
    --panel-accent: rgba(14, 165, 233, 0.22);
    --ambient-halo: rgba(14, 165, 233, 0.18);
    --accent-halo: rgba(14, 165, 233, 0.17);
    --accent-halo-light: rgba(14, 165, 233, 0.12);
}

[data-category-accent="searching"] {
    --primary: #06b6d4;
    --primary-hover: #0891b2;
    --primary-light: rgba(6, 182, 212, 0.15);
    --panel-accent: rgba(6, 182, 212, 0.22);
    --ambient-halo: rgba(6, 182, 212, 0.2);
    --accent-halo: rgba(6, 182, 212, 0.16);
    --accent-halo-light: rgba(6, 182, 212, 0.11);
}

[data-category-accent="graphs"] {
    --primary: #f97316;
    --primary-hover: #ea580c;
    --primary-light: rgba(249, 115, 22, 0.15);
    --panel-accent: rgba(249, 115, 22, 0.2);
    --ambient-halo: rgba(249, 115, 22, 0.2);
    --accent-halo: rgba(249, 115, 22, 0.16);
    --accent-halo-light: rgba(249, 115, 22, 0.1);
}

[data-category-accent="trees"] {
    --primary: #22c55e;
    --primary-hover: #16a34a;
    --primary-light: rgba(34, 197, 94, 0.15);
    --panel-accent: rgba(34, 197, 94, 0.2);
    --ambient-halo: rgba(34, 197, 94, 0.2);
    --accent-halo: rgba(34, 197, 94, 0.15);
    --accent-halo-light: rgba(34, 197, 94, 0.1);
}

[data-category-accent="dp"] {
    --primary: #eab308;
    --primary-hover: #ca8a04;
    --primary-light: rgba(234, 179, 8, 0.16);
    --panel-accent: rgba(234, 179, 8, 0.22);
    --ambient-halo: rgba(234, 179, 8, 0.18);
    --accent-halo: rgba(234, 179, 8, 0.16);
    --accent-halo-light: rgba(234, 179, 8, 0.12);
}

[data-category-accent="strings"] {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: rgba(59, 130, 246, 0.16);
    --panel-accent: rgba(59, 130, 246, 0.2);
    --ambient-halo: rgba(59, 130, 246, 0.2);
    --accent-halo: rgba(59, 130, 246, 0.16);
    --accent-halo-light: rgba(59, 130, 246, 0.11);
}

[data-category-accent="geometry"] {
    --primary: #14b8a6;
    --primary-hover: #0f766e;
    --primary-light: rgba(20, 184, 166, 0.16);
    --panel-accent: rgba(20, 184, 166, 0.2);
    --ambient-halo: rgba(20, 184, 166, 0.2);
    --accent-halo: rgba(20, 184, 166, 0.16);
    --accent-halo-light: rgba(20, 184, 166, 0.11);
}

[data-category-accent="advanced"] {
    --primary: #ef4444;
    --primary-hover: #dc2626;
    --primary-light: rgba(239, 68, 68, 0.16);
    --panel-accent: rgba(239, 68, 68, 0.2);
    --ambient-halo: rgba(239, 68, 68, 0.2);
    --accent-halo: rgba(239, 68, 68, 0.16);
    --accent-halo-light: rgba(239, 68, 68, 0.1);
}

/* === Global Resets & Base Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background:
        radial-gradient(circle at 12% 18%, var(--accent-halo), transparent 34%),
        radial-gradient(circle at 84% 8%, rgba(34, 197, 94, 0.12), transparent 28%),
        radial-gradient(circle at 82% 84%, rgba(245, 158, 11, 0.14), transparent 24%),
        var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background var(--transition-base), color var(--transition-base);
    min-height: 100vh;
    position: relative;
}

[data-theme="light"] body {
    background:
        radial-gradient(circle at 10% 16%, var(--accent-halo-light), transparent 36%),
        radial-gradient(circle at 84% 10%, rgba(34, 197, 94, 0.1), transparent 30%),
        radial-gradient(circle at 78% 88%, rgba(245, 158, 11, 0.1), transparent 26%),
        var(--bg-primary);
}

body::before,
body::after {
    content: '';
    position: fixed;
    pointer-events: none;
    z-index: -1;
    filter: blur(18px);
}

body::before {
    width: 340px;
    height: 340px;
    left: -120px;
    top: calc(var(--navbar-height) + 28px);
    background: radial-gradient(circle at 30% 30%, var(--ambient-halo), transparent 68%);
    animation: ambientFloat 12s ease-in-out infinite;
}

body::after {
    width: 420px;
    height: 420px;
    right: -140px;
    bottom: -120px;
    background: radial-gradient(circle at 30% 30%, rgba(34, 197, 94, 0.14), transparent 72%);
    animation: ambientFloat 15s ease-in-out infinite reverse;
}

/* === Navbar === */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    flex-wrap: wrap;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-right: auto;
}

.logo-icon {
    color: var(--primary);
    filter: drop-shadow(0 0 10px rgba(14, 165, 233, 0.45));
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.2px;
    background: linear-gradient(135deg, var(--primary), #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.badge {
    padding: 2px 8px;
    background: linear-gradient(135deg, #0ea5e9, #22c55e);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.navbar-controls {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-group label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.35px;
    text-transform: uppercase;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-wrap: wrap;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
    outline: none;
    font-family: inherit;
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    box-shadow: 0 6px 16px rgba(14, 165, 233, 0.35);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(14, 165, 233, 0.45);
}

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

.btn-secondary {
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(180deg, var(--bg-tertiary), var(--surface));
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn.selected-tool {
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 8px 18px rgba(14, 165, 233, 0.35);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

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

.btn-icon {
    padding: 8px;
    background: rgba(148, 163, 184, 0.06);
    color: var(--text-secondary);
    border-color: var(--border-color);
}

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

.btn-icon.active {
    color: var(--primary);
}

.btn-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

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

.toggle-switch {
    width: 36px;
    height: 20px;
    background: var(--bg-tertiary);
    border-radius: 10px;
    position: relative;
    transition: background var(--transition-fast);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: transform var(--transition-fast);
}

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

.btn-toggle.active .toggle-switch::after {
    transform: translateX(16px);
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 4px 8px;
    font-size: 0.75rem;
}

#selfTestBtn {
    border-color: rgba(34, 197, 94, 0.35);
    background: linear-gradient(180deg, rgba(34, 197, 94, 0.18), rgba(14, 165, 233, 0.12));
}

#selfTestBtn:hover:not(:disabled) {
    border-color: rgba(34, 197, 94, 0.6);
    box-shadow: 0 10px 18px rgba(34, 197, 94, 0.2);
}

/* === Form Controls === */
.select-control {
    padding: 8px 12px;
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all var(--transition-fast);
}

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

.select-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.numeric-control {
    padding: 8px 12px;
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    outline: none;
    width: 100%;
    min-height: 38px;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.numeric-control:hover {
    border-color: var(--primary);
}

.numeric-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 120px;
    height: 6px;
    background: linear-gradient(90deg, var(--bg-tertiary), var(--surface-raised));
    border-radius: 3px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, var(--primary), #2563eb);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, var(--primary), #2563eb);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.divider {
    width: 1px;
    height: 24px;
    background: var(--divider-color);
}

/* === Main Container === */
.main-container {
    display: flex;
    height: calc(100vh - var(--navbar-height));
    height: calc(100dvh - var(--navbar-height));
    min-height: calc(100svh - var(--navbar-height));
    overflow: hidden;
}

/* === Sidebar === */
.sidebar {
    width: 280px;
    flex: 0 0 280px;
    max-width: 280px;
    background: linear-gradient(165deg, var(--surface), var(--surface-raised) 62%, var(--bg-secondary));
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition:
        transform var(--transition-base),
        width var(--transition-base),
        max-width var(--transition-base),
        flex-basis var(--transition-base),
        opacity var(--transition-fast);
}

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

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--panel-accent), transparent);
}

.sidebar-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.sidebar-search {
    padding: var(--space-2);
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--panel-accent), transparent);
}

.search-control {
    width: 100%;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--bg-primary), var(--surface-raised));
    color: var(--text-primary);
    font-size: 0.875rem;
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.search-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.search-row .search-control {
    flex: 1;
    min-width: 0;
}

.search-clear {
    flex: 0 0 auto;
    width: 34px;
    height: 34px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--text-secondary);
}

.search-clear:hover {
    color: var(--danger);
    border-color: var(--danger);
    background: var(--danger-light);
}

.search-meta {
    margin-top: 8px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.search-meta.empty {
    color: var(--danger);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-2);
}

.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

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

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

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

.algo-category {
    margin-bottom: var(--space-3);
}

.category-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

.algo-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.algo-btn {
    width: 100%;
    padding: 10px 12px;
    text-align: left;
    background: rgba(148, 163, 184, 0.03);
    color: var(--text-primary);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.algo-btn::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 100%;
    background: var(--primary);
    transform: scaleY(0);
    transition: transform var(--transition-fast);
}

.algo-btn:hover {
    background: var(--primary-light);
    border-color: var(--border-color);
    transform: translateX(2px);
}

.algo-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 500;
    box-shadow: inset 0 0 0 1px rgba(14, 165, 233, 0.3), var(--shadow-sm);
}

.algo-btn.active::before {
    transform: scaleY(1);
}

.sidebar-footer {
    padding: var(--space-2);
    border-top: 1px solid var(--border-color);
}

/* === Content Area === */
.content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: linear-gradient(180deg, transparent, rgba(15, 23, 42, 0.08));
}

/* === Analytics Bar === */
.analytics-bar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    background: var(--surface-glass);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: thin;
}

.metric {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 16px;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    min-width: 120px;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.metric:hover {
    transform: translateY(-1px);
    border-color: rgba(14, 165, 233, 0.35);
    box-shadow: var(--shadow-sm);
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.metric-value.complexity {
    color: var(--primary);
    font-family: var(--font-mono);
    font-size: 1rem;
}

/* === Visualization Container === */
.visualization-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    padding: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
}

#visualizationCanvas {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
    background:
        linear-gradient(180deg, rgba(148, 163, 184, 0.08), rgba(15, 23, 42, 0.05)),
        repeating-linear-gradient(
            90deg,
            transparent 0,
            transparent 35px,
            rgba(148, 163, 184, 0.08) 36px
        );
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

/* === Graph Container === */
.graph-container {
    width: 100%;
    height: 100%;
    position: relative;
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.08), rgba(15, 23, 42, 0.04));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.graph-node {
    position: absolute;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), #2563eb);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    cursor: move;
    user-select: none;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast);
    touch-action: none;
}

.graph-node:hover {
    transform: scale(1.1);
}

.graph-node.visiting {
    background: linear-gradient(135deg, var(--warning), #f59e0b);
    animation: pulse 0.5s ease-in-out;
}

.graph-node.visited {
    background: linear-gradient(135deg, var(--success), #16a34a);
}

.graph-node.current {
    background: linear-gradient(135deg, var(--viz-current), #ea580c);
    box-shadow: 0 0 20px rgba(249, 115, 22, 0.55);
}

.graph-edge {
    position: absolute;
    height: 2px;
    background: var(--border-color);
    transform-origin: left center;
    pointer-events: none;
    transition: background var(--transition-fast);
}

.graph-edge.active {
    background: var(--primary);
    box-shadow: 0 0 8px var(--primary);
}

.graph-edge-weight {
    position: absolute;
    background: var(--surface);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

/* === Tree Container === */
.tree-container {
    width: 100%;
    height: 100%;
    position: relative;
    background: linear-gradient(180deg, rgba(148, 163, 184, 0.08), rgba(15, 23, 42, 0.04));
    border-radius: var(--radius-lg);
    overflow: auto;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.tree-node {
    position: absolute;
    width: 45px;
    height: 45px;
    background: linear-gradient(135deg, var(--primary), #2563eb);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast);
}

.tree-node.current {
    background: linear-gradient(135deg, var(--viz-current), #ea580c);
    transform: scale(1.2);
    box-shadow: 0 0 20px rgba(249, 115, 22, 0.55);
}

.tree-node.visited {
    background: linear-gradient(135deg, var(--success), #16a34a);
}

.tree-edge {
    position: absolute;
    height: 2px;
    background: var(--border-color);
    transform-origin: left center;
}

.tree-edge.active {
    background: var(--primary);
}

/* === DP Table === */
.dp-table {
    padding: var(--space-3);
    overflow: auto;
}

.dp-table table {
    border-collapse: collapse;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.dp-table table.generated-dp-table {
    margin: 20px auto;
    font-size: 12px;
}

.dp-table table.generated-dp-table caption {
    caption-side: top;
    margin-bottom: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.dp-table th,
.dp-table td {
    padding: 12px 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    min-width: 60px;
    font-variant-numeric: tabular-nums;
}

.dp-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
}

.dp-table th.dp-row-label {
    text-align: left;
    min-width: 96px;
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-tertiary));
}

.dp-table td {
    transition: all var(--transition-fast);
}

.dp-table td.current {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

.dp-table td.filled {
    background: var(--success-light);
    color: var(--success);
}

/* === Graph Tools === */
.graph-tools {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    background: var(--surface-glass);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.graph-tools label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    cursor: pointer;
}

.graph-tools input[type="checkbox"] {
    cursor: pointer;
}

/* === Step Indicator === */
.step-indicator {
    padding: var(--space-2);
    background: var(--surface-glass);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--border-color);
}

.step-progress {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--space-1);
}

.step-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #22c55e);
    width: 0%;
    transition: width var(--transition-base);
}

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

/* === Right Panel === */
.right-panel {
    width: 380px;
    flex: 0 0 380px;
    max-width: 380px;
    background: linear-gradient(195deg, var(--surface), var(--surface-raised) 58%, var(--bg-secondary));
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition:
        transform var(--transition-base),
        width var(--transition-base),
        max-width var(--transition-base),
        flex-basis var(--transition-base),
        opacity var(--transition-fast);
}

.right-panel.collapsed {
    transform: translateX(100%);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-2);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.panel-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--bg-primary), var(--surface-raised));
    position: sticky;
    top: 0;
    z-index: 2;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition:
        color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
    position: relative;
    letter-spacing: 0.28px;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform var(--transition-fast);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--surface-raised);
    transform: translateY(-1px);
}

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

.tab-btn.active::after {
    transform: scaleX(1);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3);
    line-height: 1.62;
}

.panel-content::-webkit-scrollbar {
    width: 6px;
}

.panel-content::-webkit-scrollbar-track {
    background: transparent;
}

.panel-content::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: tabReveal 0.34s cubic-bezier(0.22, 1, 0.36, 1);
}

.tab-content h4 {
    font-size: 1.28rem;
    margin-bottom: var(--space-2);
    color: var(--text-primary);
    letter-spacing: 0.18px;
    line-height: 1.25;
}

.algo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: -2px 0 var(--space-2) 0;
}

.meta-pill {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    color: var(--text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.tab-content h5 {
    font-size: 1rem;
    margin-bottom: var(--space-1);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: 0.12px;
}

.tab-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-2);
    max-width: 68ch;
}

.info-card {
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.info-card:hover {
    transform: translateY(-1px);
    border-color: rgba(14, 165, 233, 0.3);
    box-shadow: var(--shadow-md);
}

.info-card ul,
.info-card ol {
    margin-left: var(--space-2);
    color: var(--text-secondary);
}

.info-card li {
    margin-bottom: 6px;
}

/* === Complexity Grid === */
.complexity-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.complexity-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-2);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.complexity-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.complexity-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary);
    font-family: var(--font-mono);
}

/* === Code Block === */
.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-1) var(--space-2);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.code-block {
    margin: 0 0 var(--space-2) 0;
    padding: var(--space-2);
    background: linear-gradient(180deg, var(--bg-primary), var(--surface-raised));
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    overflow-x: auto;
    border: 1px solid var(--border-color);
    border-top: none;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.pseudocode {
    margin: 0 0 var(--space-2) 0;
    padding: var(--space-2);
    background: linear-gradient(180deg, var(--bg-primary), var(--surface-raised));
    border-radius: var(--radius-md);
    overflow-x: auto;
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* === Quiz === */
.quiz-question {
    margin-bottom: var(--space-3);
}

.quiz-question p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.quiz-option {
    width: 100%;
    padding: 12px 16px;
    text-align: left;
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.quiz-option:hover {
    border-color: var(--primary);
    background: var(--primary-light);
}

.quiz-option.correct {
    border-color: var(--success);
    background: var(--success-light);
    color: var(--success);
}

.quiz-option.incorrect {
    border-color: var(--danger);
    background: var(--danger-light);
    color: var(--danger);
}

.quiz-option:disabled {
    cursor: not-allowed;
}

.quiz-feedback {
    padding: var(--space-2);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
    font-size: 0.875rem;
}

.quiz-feedback.correct {
    background: var(--success-light);
    border: 1px solid var(--success);
    color: var(--success);
}

.quiz-feedback.incorrect {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
}

.quiz-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-2);
    padding: var(--space-2);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.quiz-stats .stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.quiz-stats .stat span {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.quiz-stats .stat strong {
    font-size: 1.5rem;
    color: var(--primary);
}

/* === Modal === */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: var(--space-2);
}

.modal.active {
    display: flex;
    animation: fadeIn 0.2s ease-in-out;
}

.modal-content {
    background: linear-gradient(180deg, var(--surface-raised), var(--surface));
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    animation: slideUp 0.3s ease-out;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger-light);
    color: var(--danger);
}

.modal-body {
    padding: var(--space-3);
    overflow-y: auto;
    max-height: calc(90vh - 80px);
}

.comparison-selectors {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2);
    margin-bottom: var(--space-3);
}

.comparison-advanced-controls {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
    margin-bottom: var(--space-2);
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, rgba(14, 165, 233, 0.08), rgba(34, 197, 94, 0.06));
    backdrop-filter: blur(2px);
}

.selector-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.selector-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.comparison-results {
    margin-top: var(--space-3);
}

.comparison-status {
    margin-top: var(--space-2);
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.comparison-status.running {
    border-color: var(--warning);
    color: var(--warning);
}

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

.comparison-status.error {
    border-color: var(--danger);
    color: var(--danger);
}

.comparison-status.cancelled {
    border-color: var(--info);
    color: var(--info);
}

.comparison-progress {
    margin-top: 10px;
    height: 6px;
    border-radius: 999px;
    background: var(--bg-tertiary);
    overflow: hidden;
}

.comparison-progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #22c55e);
    transition: width var(--transition-base);
}

.comparison-table {
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
}

.comparison-table td {
    font-variant-numeric: tabular-nums;
}

.comparison-table tbody tr:hover td {
    background: rgba(14, 165, 233, 0.08);
}

.winner-cell {
    text-align: center;
    font-weight: 600;
    color: var(--success);
}

.winner-cell.error {
    color: var(--danger);
}

.self-test-status {
    margin: var(--space-2) 0;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.self-test-status.running {
    border-color: var(--warning);
    background: linear-gradient(180deg, rgba(245, 158, 11, 0.14), var(--bg-primary));
    color: var(--warning);
}

.self-test-status.pass {
    border-color: var(--success);
    background: linear-gradient(180deg, rgba(34, 197, 94, 0.14), var(--bg-primary));
    color: var(--success);
}

.self-test-status.fail {
    border-color: var(--danger);
    background: linear-gradient(180deg, rgba(239, 68, 68, 0.14), var(--bg-primary));
    color: var(--danger);
}

.self-test-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: var(--space-2);
}

.self-test-card {
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 10px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.self-test-card span {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.35px;
    color: var(--text-secondary);
}

.self-test-card strong {
    display: block;
    margin-top: 4px;
    font-size: 1.2rem;
    font-family: var(--font-mono);
    color: var(--primary);
}

.self-test-results {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 0;
    padding: 0;
}

.self-test-item {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: linear-gradient(180deg, var(--surface-raised), var(--bg-primary));
}

.self-test-item.pass {
    border-color: rgba(34, 197, 94, 0.42);
}

.self-test-item.fail {
    border-color: rgba(239, 68, 68, 0.42);
}

.self-test-item.neutral {
    border-style: dashed;
}

.self-test-name {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-primary);
}

.self-test-detail {
    font-size: 0.765rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    overflow-wrap: anywhere;
}

.edge-handle {
    position: fixed;
    top: calc(var(--navbar-height) + 12px);
    z-index: 120;
    border: 1px solid var(--border-color);
    background:
        linear-gradient(120deg, rgba(14, 165, 233, 0.08), rgba(34, 197, 94, 0.05)),
        var(--surface-glass);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 8px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2px;
    box-shadow: var(--shadow-md);
    cursor: pointer;
}

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

.edge-handle-left {
    left: 8px;
}

.edge-handle-right {
    right: 8px;
}

.drawer-backdrop {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--navbar-height));
    height: calc(100dvh - var(--navbar-height));
    background: rgba(2, 6, 23, 0.45);
    backdrop-filter: blur(2px);
    z-index: 95;
}

body.drawer-open {
    overflow: hidden;
}

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

/* === Animations === */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.15);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-4px);
    }
    75% {
        transform: translateX(4px);
    }
}

@keyframes ambientFloat {
    0%,
    100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.95;
    }
    50% {
        transform: translateY(-12px) translateX(8px) scale(1.04);
        opacity: 0.75;
    }
}

@keyframes tabReveal {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* === Responsive Design === */
@media (max-width: 1400px) {
    .right-panel {
        width: 320px;
        flex-basis: 320px;
        max-width: 320px;
    }
}

@media (max-width: 1200px) {
    :root {
        --navbar-height: 124px;
    }

    .navbar-controls {
        order: 3;
        width: 100%;
    }
    
    .right-panel {
        position: fixed;
        right: 0;
        top: var(--navbar-height);
        height: calc(100vh - var(--navbar-height));
        height: calc(100dvh - var(--navbar-height));
        z-index: 100;
        box-shadow: var(--shadow-xl);
    }
}

@media (max-width: 768px) {
    :root {
        --navbar-height: 142px;
    }

    .navbar {
        padding: var(--space-1);
    }
    
    .brand-text {
        display: none;
    }
    
    .navbar-controls {
        width: 100%;
        gap: var(--space-1);
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
        scrollbar-width: thin;
        -webkit-overflow-scrolling: touch;
    }

    .navbar-actions {
        width: 100%;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 4px;
        justify-content: flex-start;
        scrollbar-width: thin;
        -webkit-overflow-scrolling: touch;
    }
    
    .control-group {
        min-width: 100px;
    }
    
    .slider {
        width: 80px;
    }
    
    .sidebar {
        position: fixed;
        left: 0;
        top: var(--navbar-height);
        height: calc(100vh - var(--navbar-height));
        height: calc(100dvh - var(--navbar-height));
        width: min(86vw, 320px);
        z-index: 100;
        box-shadow: var(--shadow-xl);
    }

    .right-panel {
        width: min(92vw, 360px);
        max-width: min(92vw, 360px);
        flex-basis: min(92vw, 360px);
    }

    .edge-handle {
        top: calc(var(--navbar-height) + 8px);
        font-size: 0.6875rem;
        padding: 7px 9px;
    }

    .main-container {
        height: calc(100vh - var(--navbar-height));
        height: calc(100dvh - var(--navbar-height));
    }
    
    .analytics-bar {
        gap: var(--space-1);
    }
    
    .metric {
        min-width: 100px;
        padding: 6px 12px;
    }
    
    .metric-value {
        font-size: 1rem;
    }
    
    .visualization-container {
        padding: 10px;
    }

    .graph-tools {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 8px;
    }

    .graph-tools .btn {
        width: 100%;
    }

    .panel-tabs {
        overflow-x: auto;
        scrollbar-width: thin;
    }

    .tab-btn {
        min-width: 88px;
        white-space: nowrap;
    }

    .comparison-selectors {
        grid-template-columns: 1fr;
    }

    .comparison-advanced-controls {
        grid-template-columns: 1fr;
        padding: 10px;
    }

    .comparison-status {
        font-size: 0.76rem;
    }
    
    .complexity-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --navbar-height: 154px;
    }

    .navbar-actions {
        gap: 4px;
    }

    .badge {
        display: none;
    }
    
    .btn {
        padding: 6px 12px;
        font-size: 0.75rem;
    }
    
    .btn svg {
        width: 14px;
        height: 14px;
    }
    
    .metric {
        min-width: 90px;
    }
    
    .metric-label {
        font-size: 0.625rem;
    }
    
    .metric-value {
        font-size: 0.875rem;
    }

    .panel-content {
        padding: var(--space-2);
    }

    .tab-btn {
        padding: 10px 8px;
        min-width: 80px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 10px 12px;
        font-size: 0.8rem;
    }

    .quiz-stats,
    .self-test-summary {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) {
    .sidebar.collapsed {
        width: 0;
        min-width: 0;
        max-width: 0;
        flex-basis: 0;
        transform: translateX(-14px);
        opacity: 0;
        pointer-events: none;
        border-right: none;
    }

    .right-panel.collapsed {
        width: 0;
        min-width: 0;
        max-width: 0;
        flex-basis: 0;
        transform: translateX(14px);
        opacity: 0;
        pointer-events: none;
        border-left: none;
    }

    .drawer-backdrop {
        display: none !important;
    }
}

/* === Print Styles === */
@media print {
    .navbar,
    .sidebar,
    .right-panel,
    .graph-tools,
    .step-indicator {
        display: none;
    }
    
    .content {
        height: auto;
    }
    
    .visualization-container {
        page-break-inside: avoid;
    }
}