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

:root {
    --gold: #D4AF37;
    --gold-light: #F6D860;
    --gold-dark: #B8941F;
    --bg-dark: #0A0A0F;
    --bg-card: #12121A;
    --text-primary: #E8E8E8;
    --text-secondary: #B0B0B8;
}

body {
    font-family: 'Source Code Pro', monospace;
    background: linear-gradient(135deg, #0A0A0F 0%, #0F0F18 50%, #12121A 100%);
    min-height: 100vh;
    color: var(--text-primary);
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 30px 20px;
}

.back-button {
    position: fixed;
    top: 24px;
    left: 24px;
    padding: 12px 24px;
    background: linear-gradient(135deg, 
        rgba(15, 15, 25, 0.85) 0%, 
        rgba(20, 20, 30, 0.85) 100%);
    border: 1px solid rgba(212, 175, 55, 0.3);
    border-radius: 12px;
    color: var(--gold-light);
    text-decoration: none;
    font-family: 'Source Code Pro', monospace;
    font-weight: 500;
    font-size: 0.95rem;
    backdrop-filter: blur(10px);
    box-shadow: 
        0 4px 20px rgba(212, 175, 55, 0.15),
        0 0 30px rgba(212, 175, 55, 0.08),
        inset 0 1px 0 rgba(212, 175, 55, 0.1);
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-button:hover {
    background: linear-gradient(135deg, 
        rgba(20, 20, 30, 0.9) 0%, 
        rgba(25, 25, 35, 0.9) 100%);
    border-color: rgba(212, 175, 55, 0.5);
    transform: translateY(-2px);
    box-shadow: 
        0 6px 30px rgba(212, 175, 55, 0.25),
        0 0 40px rgba(212, 175, 55, 0.15),
        inset 0 1px 0 rgba(212, 175, 55, 0.15);
    text-shadow: 0 0 8px rgba(246, 216, 96, 0.4);
}

header {
    text-align: center;
    margin-bottom: 30px;
    margin-top: 30px;
    color: white;
}

header h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--gold-light);
    text-shadow: 
        0 0 15px rgba(246, 216, 96, 0.3),
        0 0 30px rgba(212, 175, 55, 0.15),
        2px 2px 8px rgba(0,0,0,0.6);
}

header p {
    font-family: 'Source Code Pro', monospace;
    font-size: 1.05rem;
    font-weight: 400;
    color: var(--text-secondary);
    opacity: 0.9;
}

.controls {
    background: linear-gradient(145deg, 
        rgba(20, 20, 30, 0.7) 0%, 
        rgba(25, 25, 35, 0.7) 100%);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(212, 175, 55, 0.08),
        inset 0 1px 0 rgba(212, 175, 55, 0.1);
    border: 1px solid rgba(212, 175, 55, 0.2);
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    align-items: center;
}

.input-section, .preset-section, .layout-control, .speed-control, .range-control {
    display: flex;
    gap: 10px;
    align-items: center;
}

.input-section input {
    min-width: 200px;
}

.speed-control label, .range-control label {
    color: var(--text-secondary);
    font-weight: 500;
}

#speedValue {
    color: var(--gold-light);
    font-weight: bold;
    min-width: 20px;
    text-align: center;
}

input[type="number"] {
    padding: 12px;
    border: 1px solid rgba(212, 175, 55, 0.3);
    background: rgba(10, 10, 15, 0.8);
    border-radius: 10px;
    font-size: 16px;
    width: 120px;
    color: var(--text-primary);
    font-family: 'Source Code Pro', monospace;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3) inset;
    transition: all 0.3s ease;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--gold-light);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.2), 0 2px 8px rgba(0,0,0,0.3) inset;
}

input[type="number"]::placeholder {
    color: #718096;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    font-family: 'Source Code Pro', monospace;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.2) 0%, rgba(212, 175, 55, 0.1) 100%);
    color: var(--gold-light);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.2), 0 0 1px rgba(212, 175, 55, 0.2) inset;
    border: 1px solid rgba(212, 175, 55, 0.3);
}

button:hover {
    transform: translateY(-2px);
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.3) 0%, rgba(212, 175, 55, 0.2) 100%);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.3), 0 0 1px rgba(212, 175, 55, 0.3) inset;
}

button:active {
    transform: translateY(-1px);
}

#clearBtn {
    background: linear-gradient(135deg, rgba(245, 101, 101, 0.2) 0%, rgba(229, 62, 62, 0.2) 100%);
    box-shadow: 0 4px 15px rgba(245, 101, 101, 0.2), 0 0 1px rgba(245, 101, 101, 0.2) inset;
    border-color: rgba(245, 101, 101, 0.4);
    color: #f56565;
}

#clearBtn:hover {
    background: linear-gradient(135deg, rgba(245, 101, 101, 0.3) 0%, rgba(229, 62, 62, 0.3) 100%);
    box-shadow: 0 6px 20px rgba(245, 101, 101, 0.4), 0 0 1px rgba(245, 101, 101, 0.3) inset;
}

/* Heatmap */
.heatmap-container {
    background: linear-gradient(145deg, rgba(18, 18, 25, 0.6) 0%, rgba(22, 22, 28, 0.6) 100%);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 25px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(212, 175, 55, 0.08);
}

.heatmap-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 15px;
}

.heatmap-title-section {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.heatmap-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    color: var(--gold-light);
    font-weight: 600;
}

.heatmap-instruction {
    font-family: 'Lora', serif;
    font-size: 0.85rem;
    color: rgba(212, 175, 55, 0.7);
    font-style: italic;
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.legend-color {
    width: 16px;
    height: 10px;
    border-radius: 2px;
}

.heatmap-grid {
    display: grid;
    grid-template-columns: repeat(50, 1fr);
    gap: 2px;
    width: 100%;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 2px;
    border: 1px solid rgba(0, 0, 0, 0.3);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

.heatmap-cell:hover {
    transform: scale(1.15);
    z-index: 10;
    box-shadow: 0 0 8px rgba(212, 175, 55, 0.5);
    border-color: var(--gold);
}

.heatmap-cell.empty {
    background: rgba(30, 30, 40, 0.5);
}

.tree-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
    margin-bottom: 25px;
}

.tree-grid.layout-2 {
    grid-template-columns: repeat(2, 1fr);
}

.tree-container {
    background: linear-gradient(145deg, rgba(18, 18, 25, 0.8) 0%, rgba(22, 22, 30, 0.8) 100%);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 
        0 10px 35px rgba(0, 0, 0, 0.6), 
        0 0 50px rgba(212, 175, 55, 0.15),
        inset 0 1px 0 rgba(212, 175, 55, 0.15),
        inset 0 0 30px rgba(212, 175, 55, 0.05);
    border: 1px solid rgba(212, 175, 55, 0.4);
    transition: all 0.3s ease;
}

.tree-container:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 14px 45px rgba(0, 0, 0, 0.7), 
        0 0 60px rgba(212, 175, 55, 0.25),
        inset 0 1px 0 rgba(212, 175, 55, 0.2),
        inset 0 0 40px rgba(212, 175, 55, 0.08);
    border-color: rgba(212, 175, 55, 0.5);
}

.tree-container h3 {
    font-family: 'Playfair Display', serif;
    text-align: center;
    margin-bottom: 8px;
    color: var(--gold-light);
    font-size: 1.25rem;
    font-weight: 600;
    text-shadow: 
        0 0 12px rgba(246, 216, 96, 0.25),
        0 2px 10px rgba(0,0,0,0.6);
}

.tree-description {
    font-family: 'Lora', serif;
    font-size: 0.9rem;
    color: rgba(230, 210, 140, 0.85);
    text-align: center;
    margin-bottom: 12px;
    line-height: 1.5;
    font-weight: 500;
    text-shadow: 0 0 10px rgba(212, 175, 55, 0.3);
}

.tree-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    font-size: 0.9rem;
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    color: var(--text-secondary);
}

.tree-info .height {
    color: rgba(100, 200, 255, 0.9);
    text-shadow: 0 0 8px rgba(100, 200, 255, 0.4);
}

.tree-info .nodes {
    color: rgba(100, 255, 150, 0.9);
    text-shadow: 0 0 8px rgba(100, 255, 150, 0.4);
}

.tree-canvas {
    border: 1px solid rgba(212, 175, 55, 0.18);
    border-radius: 12px;
    background: linear-gradient(135deg, 
        rgba(15, 15, 22, 0.7) 0%, 
        rgba(18, 18, 25, 0.7) 100%);
    display: block;
    margin: 0 auto;
    box-shadow: 
        0 4px 20px rgba(0, 0, 0, 0.5) inset,
        0 0 30px rgba(212, 175, 55, 0.05);
}

.tree-usage {
    font-family: 'Lora', serif;
    font-size: 0.85rem;
    color: rgba(212, 175, 55, 0.75);
    font-style: italic;
    line-height: 1.4;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid rgba(212, 175, 55, 0.1);
    text-align: center;
    text-shadow: 0 0 8px rgba(212, 175, 55, 0.25);
}

.warning-text {
    color: rgba(244, 67, 54, 0.9);
    font-weight: 600;
    text-shadow: 0 0 10px rgba(244, 67, 54, 0.4);
    font-style: normal;
}

.caution-text {
    color: rgba(255, 152, 0, 0.9);
    font-weight: 600;
    text-shadow: 0 0 8px rgba(255, 152, 0, 0.3);
    font-style: normal;
}

.advantage-text {
    color: rgba(76, 175, 80, 0.9);
    font-weight: 600;
    text-shadow: 0 0 8px rgba(76, 175, 80, 0.3);
    font-style: normal;
}

.operation-log {
    background: linear-gradient(145deg, rgba(28, 28, 38, 0.85) 0%, rgba(32, 32, 42, 0.85) 100%);
    border-radius: 16px;
    padding: 20px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    max-height: 400px;
    overflow-y: auto;
}

.operation-log h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    color: var(--gold-light);
    margin-bottom: 15px;
    text-shadow: 0 0 12px rgba(246, 216, 96, 0.25);
}

#logContent {
    font-family: 'Source Code Pro', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.log-entry {
    padding: 8px 12px;
    margin-bottom: 6px;
    background: rgba(15, 15, 22, 0.5);
    border-radius: 6px;
    border-left: 3px solid rgba(212, 175, 55, 0.4);
    color: var(--text-secondary);
    font-weight: 600;
}

.log-entry:last-child {
    border-bottom: none;
}

.log-entry.insert {
    border-left-color: #4CAF50;
    color: rgba(76, 175, 80, 0.9);
}

.log-entry.delete {
    border-left-color: #f44336;
    color: rgba(244, 67, 54, 0.9);
}

.log-entry.search {
    color: #4299e1;
    border-left-color: #4299e1;
}

.log-entry.rotation {
    border-left-color: #FF9800;
    color: rgba(255, 152, 0, 0.9);
}

/* Tree node styles */
.tree-node {
    cursor: pointer;
    transition: all 0.3s ease;
}

.tree-node.highlighted {
    filter: drop-shadow(0 0 8px var(--gold-light));
}

.tree-node.inserting {
    animation: pulse 1s ease-in-out;
}

.tree-node.deleting {
    animation: fadeOut 1s ease-in-out;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@keyframes fadeOut {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes wobble {
    0% { 
        transform: translateX(0) rotate(0deg) scale(1); 
        filter: drop-shadow(0 0 0px transparent);
    }
    10% { 
        transform: translateX(-4px) rotate(-3deg) scale(1.08);
        filter: drop-shadow(0 0 12px var(--gold-light));
    }
    25% { 
        transform: translateX(4px) rotate(3deg) scale(1.06);
        filter: drop-shadow(0 0 10px var(--gold-light));
    }
    40% { 
        transform: translateX(-2px) rotate(-2deg) scale(1.03);
        filter: drop-shadow(0 0 8px var(--gold-light));
    }
    60% { 
        transform: translateX(2px) rotate(1.5deg) scale(1.02);
        filter: drop-shadow(0 0 6px var(--gold-light));
    }
    80% { 
        transform: translateX(-1px) rotate(-0.5deg) scale(1.01);
        filter: drop-shadow(0 0 4px var(--gold-light));
    }
    100% { 
        transform: translateX(0) rotate(0deg) scale(1);
        filter: drop-shadow(0 0 0px transparent);
    }
}

.tree-node.wobble {
    animation: wobble 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.tree-node.new-node circle {
    stroke: var(--gold-light);
    stroke-width: 2;
    stroke-dasharray: 5, 3;
}

.metrics-panel {
    background: linear-gradient(145deg, rgba(28, 28, 38, 0.85) 0%, rgba(32, 32, 42, 0.85) 100%);
    border-radius: 16px;
    padding: 25px;
    margin-bottom: 25px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.metrics-panel h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--gold-light);
    margin-bottom: 20px;
    text-align: center;
    text-shadow: 0 0 15px rgba(246, 216, 96, 0.3);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.metric-card {
    background: linear-gradient(145deg, rgba(18, 18, 25, 0.8) 0%, rgba(22, 22, 30, 0.8) 100%);
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 
        0 4px 20px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(212, 175, 55, 0.08);
}

.metric-card h4 {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    color: var(--gold-light);
    margin-bottom: 15px;
    text-align: center;
    font-weight: 600;
}

.chart {
    min-height: 120px;
    position: relative;
}

/* KEY BAR STYLES FROM PREV - KEEPING THESE INTACT */
/* Support both class naming conventions */
.chart-bar,
.bar-container {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.chart-label,
.bar-label {
    width: 60px;
    font-weight: bold;
    text-transform: uppercase;
    font-family: 'Source Code Pro', monospace;
    color: var(--text-secondary);
    text-shadow: 0 0 6px rgba(176, 176, 184, 0.25);
}

.bar-wrapper {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.chart-bar-fill,
.bar-fill {
    height: 20px;
    border-radius: 10px;
    margin: 0 10px;
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    padding: 0 8px;
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
    max-width: calc(100% - 20px);
    box-shadow: 0 0 8px currentColor, inset 0 0 8px rgba(255, 255, 255, 0.15);
    filter: brightness(1.05);
}

.chart-value,
.bar-value {
    min-width: 30px;
    text-align: right;
    font-weight: bold;
    font-family: 'Source Code Pro', monospace;
    color: var(--text-primary);
    filter: drop-shadow(0 0 6px currentColor);
}

.properties {
    font-size: 0.85rem;
}

.property-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
}

.property-row:last-child {
    border-bottom: none;
}

.property-label {
    font-weight: bold;
    color: var(--text-secondary);
    font-family: 'Source Code Pro', monospace;
}

.property-value {
    color: var(--gold-light);
    font-weight: 600;
    font-family: 'Source Code Pro', monospace;
}

.property-value.warning {
    color: #ed8936;
}

.property-value.danger {
    color: #f56565;
}

/* Explanation Card */
.explanation-card {
    background: linear-gradient(145deg, rgba(18, 18, 25, 0.8) 0%, rgba(22, 22, 30, 0.8) 100%);
    border-radius: 12px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid rgba(212, 175, 55, 0.2);
    box-shadow: 
        0 4px 20px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(212, 175, 55, 0.08);
}

.explanation-card h4 {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    color: var(--gold-light);
    margin-bottom: 15px;
    text-align: center;
    font-weight: 600;
}

.explanation-card p {
    font-family: 'Lora', serif;
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.explanation-card p:last-child {
    margin-bottom: 0;
}

.explanation-card strong {
    color: var(--gold-light);
    font-weight: 600;
}

/* Layout control */
.layout-control {
    display: flex;
    gap: 8px;
    align-items: center;
}

.layout-btn {
    padding: 8px 16px;
    font-size: 0.85rem;
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.15) 0%, rgba(212, 175, 55, 0.08) 100%);
    border: 1px solid rgba(212, 175, 55, 0.25);
    color: rgba(212, 175, 55, 0.7);
    transition: all 0.3s ease;
}

.layout-btn:hover {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.25) 0%, rgba(212, 175, 55, 0.15) 100%);
    border-color: rgba(212, 175, 55, 0.4);
    color: var(--gold-light);
}

.layout-btn.active {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.3) 0%, rgba(212, 175, 55, 0.2) 100%);
    border-color: var(--gold-light);
    color: var(--gold-light);
    box-shadow: 0 0 12px rgba(212, 175, 55, 0.3);
}

/* Colored preset buttons */
#randomBtn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.18) 0%, rgba(56, 142, 60, 0.18) 100%);
    border-color: rgba(76, 175, 80, 0.4);
    color: #90E090;
}

#randomBtn:hover {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.28) 0%, rgba(56, 142, 60, 0.28) 100%);
    border-color: rgba(76, 175, 80, 0.6);
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.3);
}

#sequentialBtn {
    background: linear-gradient(135deg, rgba(33, 150, 243, 0.18) 0%, rgba(25, 118, 210, 0.18) 100%);
    border-color: rgba(33, 150, 243, 0.4);
    color: #90D0FF;
}

#sequentialBtn:hover {
    background: linear-gradient(135deg, rgba(33, 150, 243, 0.28) 0%, rgba(25, 118, 210, 0.28) 100%);
    border-color: rgba(33, 150, 243, 0.6);
    box-shadow: 0 0 20px rgba(33, 150, 243, 0.3);
}

#sequentialGrowBtn {
    background: linear-gradient(135deg, rgba(156, 39, 176, 0.18) 0%, rgba(123, 31, 162, 0.18) 100%);
    border-color: rgba(156, 39, 176, 0.4);
    color: #D090E0;
}

#sequentialGrowBtn:hover {
    background: linear-gradient(135deg, rgba(156, 39, 176, 0.28) 0%, rgba(123, 31, 162, 0.28) 100%);
    border-color: rgba(156, 39, 176, 0.6);
    box-shadow: 0 0 20px rgba(156, 39, 176, 0.3);
}

/* Tree-specific colors for charts */
.bst-color { background: #2196F3; }
.avl-color { background: #4CAF50; }
.rbt-color { background: #f44336; }
.sbt-color { background: #FF9800; }
.treap-color { background: #9C27B0; }
.splay-color { background: #00BCD4; }
.tree234-color { background: #795548; }

/* Speed slider styling */
input[type="range"] {
    width: 100px;
    height: 6px;
    border-radius: 3px;
    background: rgba(212, 175, 55, 0.2);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--gold-light);
    cursor: pointer;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--gold-light);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.5);
}

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

::-webkit-scrollbar-track {
    background: rgba(10, 10, 15, 0.5);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: rgba(212, 175, 55, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(212, 175, 55, 0.5);
}

/* Responsive design */
@media (max-width: 1200px) {
    .tree-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .input-section, .preset-section, .sequential-section {
        justify-content: center;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}