:root {
    --bg-color: #0b0f19;
    --card-bg: #111827;
    --accent: #0ea5e9;
    --accent-hover: #0284c7;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border: #1f2937;
    --success: #22c55e;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 25px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

h1 { 
    text-align: center; 
    margin-bottom: 30px; 
    color: var(--text-main); 
    font-weight: 600;
    letter-spacing: -0.025em;
}

/* Upload Zone */
.upload-area {
    border: 2px dashed var(--accent);
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    background: var(--card-bg);
    cursor: pointer;
    margin-bottom: 30px;
    transition: all 0.2s ease;
}

.upload-area:hover { 
    background: #162032; 
    border-color: var(--accent-hover);
}

/* Metric Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.kpi-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
    text-align: center;
}

.kpi-title { 
    font-size: 0.75rem; 
    color: var(--text-muted); 
    text-transform: uppercase; 
    letter-spacing: 0.05em;
    margin-bottom: 8px; 
}

.kpi-value { 
    font-size: 1.8rem; 
    font-weight: 700; 
    color: var(--accent); 
}

/* Share Actions Container */
.share-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

.share-action-btn {
    background-color: #1f2937;
    border: 1px solid var(--accent);
    color: var(--text-main);
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.share-action-btn:hover {
    background-color: var(--accent);
    color: #fff;
}

.share-toast {
    margin-top: 10px;
    font-size: 0.8rem;
    color: var(--success);
    display: none;
    font-weight: 500;
}

/* Charts Layout */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(600px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

@media (max-width: 768px) {
    .charts-grid { grid-template-columns: 1fr; }
}

.chart-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.chart-card.full-width { 
    grid-column: 1 / -1; 
}

.chart-card h3 { 
    margin-top: 0; 
    margin-bottom: 15px; 
    color: var(--text-main); 
    font-size: 1rem;
    font-weight: 600;
}

/* Universal Chart Tabs */
.chart-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.chart-tab {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 5px 10px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.chart-tab:hover {
    color: var(--text-main);
    border-color: var(--accent);
}

.chart-tab.active {
    background-color: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* Custom Heatmap Grid */
.heatmap-container {
    display: grid;
    grid-template-columns: 60px repeat(24, 1fr);
    gap: 3px;
    overflow-x: auto;
    padding-top: 10px;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 2px;
    background-color: rgba(14, 165, 233, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    color: transparent;
    transition: color 0.2s, outline 0.2s;
}

.heatmap-cell:hover { 
    color: #fff; 
    outline: 1px solid var(--accent); 
}

.heatmap-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
}

/* Leaderboard Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 5px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

th { 
    color: var(--text-muted); 
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

tr:hover td {
    background-color: rgba(255, 255, 255, 0.01);
}