:root {
    /* SAP Brand Colors */
    --sap-blue: #0a6ed1;
    --sap-blue-dark: #0854a0;
    --sap-blue-light: #e6f2f9;
    --sap-orange: #f58b00;
    --sap-orange-dark: #c36a00;
    --sap-orange-light: #fff8e6;
    --sap-green: #5cba47;
    --sap-green-dark: #4a9b38;
    --sap-green-light: #e6f2e6;
    --sap-purple: #7c4dff;
    --sap-purple-dark: #5c3db3;
    --sap-purple-light: #f0e6ff;

    /* Dark Theme Colors */
    --dark-bg: #1a1a1a;
    --dark-card-bg: #242424;
    --dark-highlight: #2d2d2d;
    --dark-border: #333333;
    --dark-text: #e0e0e0;
    --dark-text-secondary: #a0a0a0;
    --dark-shadow: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--dark-bg);
    color: var(--dark-text);
    line-height: 1.6;
}

#sap-delta-app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.sap-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--dark-border);
}

.sap-logo {
    color: var(--sap-blue);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--dark-card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 4px var(--dark-shadow);
}

.sap-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--dark-text);
}

/* Controls */
.sap-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--dark-card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

.sap-control-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sap-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.sap-btn-primary:hover {
    background-color: var(--sap-blue-dark);
    transform: translateY(-1px);
}

.sap-btn-secondary {
    background-color: var(--dark-highlight);
    color: var(--dark-text);
}

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

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

.sap-speed-controls {
    display: flex;
    gap: 0.5rem;
}

.sap-btn-speed {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

.sap-btn-speed.sap-active {
    background-color: var(--sap-blue);
    color: white;
}

.sap-select {
    padding: 0.5rem;
    background-color: var(--dark-highlight);
    color: var(--dark-text);
    border: 1px solid var(--dark-border);
    border-radius: 6px;
    cursor: pointer;
}

/* Explanation */
.sap-explanation {
    background-color: var(--dark-card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

/* Storage Grid */
.sap-storage-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.sap-storage-card {
    background-color: var(--dark-card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

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

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

.sap-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}

.sap-badge[data-type="main"] {
    background-color: var(--sap-blue-light);
    color: var(--sap-blue-dark);
}

.sap-badge[data-type="delta"] {
    background-color: var(--sap-green-light);
    color: var(--sap-green-dark);
}

/* Column Store */
.sap-column-store {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.sap-column {
    background-color: var(--dark-highlight);
    border-radius: 6px;
    overflow: hidden;
}

.sap-column-header {
    background-color: var(--sap-blue);
    color: white;
    padding: 0.75rem;
    font-weight: 500;
    text-align: center;
}

.sap-column-content {
    padding: 0.75rem;
}

.sap-column-row {
    padding: 0.5rem;
    text-align: center;
    border-bottom: 1px solid var(--dark-border);
}

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

/* Row Store */
.sap-row-store {
    overflow-x: auto;
}

.sap-row-table {
    width: 100%;
    border-collapse: collapse;
}

.sap-row-table th {
    background-color: var(--sap-green);
    color: white;
    padding: 0.75rem;
    text-align: left;
}

.sap-row-table td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--dark-border);
}

.sap-row-table tr:last-child td {
    border-bottom: none;
}

/* Merge Overlay */
.sap-merge-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.sap-merge-progress {
    text-align: center;
    color: white;
}

.sap-progress-bar {
    width: 200px;
    height: 8px;
    background-color: var(--dark-border);
    border-radius: 4px;
    margin: 1rem 0;
    overflow: hidden;
}

.sap-progress-fill {
    height: 100%;
    background-color: var(--sap-blue);
    transition: width 0.3s ease;
}

/* Query Behavior */
.sap-query-behavior {
    background-color: var(--dark-card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

.sap-query-visualization {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.sap-query-box {
    background-color: var(--dark-highlight);
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    min-width: 120px;
}

.sap-query-operator {
    color: var(--dark-text-secondary);
    font-size: 1.5rem;
}

/* Performance Metrics */
.sap-metrics {
    background-color: var(--dark-card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

.sap-metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.sap-metric-card {
    background-color: var(--dark-highlight);
    padding: 1.5rem;
    border-radius: 6px;
    text-align: center;
}

.sap-metric-value {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0.5rem 0;
    color: var(--sap-blue);
}

.sap-metric-note {
    font-size: 0.875rem;
    color: var(--dark-text-secondary);
}

/* Advantages */
.sap-advantages {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.sap-advantage-card {
    background-color: var(--dark-card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--dark-shadow);
}

.sap-advantage-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--sap-blue);
}

.sap-advantage-card ul {
    list-style-type: none;
}

.sap-advantage-card li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.sap-advantage-card li::before {
    content: "•";
    color: var(--sap-blue);
    position: absolute;
    left: 0;
}

/* Footer */
.sap-footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--dark-text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid var(--dark-border);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sap-storage-grid {
        grid-template-columns: 1fr;
    }
    
    .sap-metrics-grid {
        grid-template-columns: 1fr;
    }
    
    .sap-advantages {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sap-controls {
        flex-direction: column;
    }
    
    .sap-control-group {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .sap-query-visualization {
        flex-direction: column;
    }
}