:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --muted-text: #64748b;
    --kpi-bg: #f1f5f9;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --primary-color: #60a5fa;
    --secondary-color: #3b82f6;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --border-color: #334155;
    --success-color: #34d399;
    --warning-color: #fbbf24;
    --muted-text: #94a3b8;
    --kpi-bg: #0f172a;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

header h1 { font-size: 1.5rem; color: var(--primary-color); }

.header-controls { display: flex; align-items: center; gap: 15px; font-size: 0.9rem; }

.status { font-weight: bold; color: var(--warning-color); }
.status.ready { color: var(--success-color); }

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.2s;
}
button:hover { background-color: var(--secondary-color); }

#dark-mode-toggle {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
}
#dark-mode-toggle:hover {
    background-color: var(--border-color);
    color: var(--text-color);
}

section {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}

section h2, section h3 { margin-bottom: 15px; color: var(--text-color); }

.filters-container { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

select, input[type="date"] {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.kpi-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.kpi-card {
    background: var(--kpi-bg);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.kpi-card h3 { font-size: 0.85rem; color: var(--muted-text); margin-bottom: 5px; }
.kpi-card p { font-size: 1.25rem; font-weight: bold; color: var(--primary-color); }

.charts-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.chart-container {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

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

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { padding: 10px; text-align: left; border-bottom: 1px solid var(--border-color); }
th { background-color: var(--kpi-bg); font-weight: 600; position: sticky; top: 0; }

.questions-section .question-block {
    margin-bottom: 15px;
    padding: 15px;
    background: var(--kpi-bg);
    border-radius: 6px;
    border-left: 4px solid var(--primary-color);
}

.questions-section .question-text { font-weight: 600; margin-bottom: 8px; }
.questions-section .answer-text { color: var(--text-color); font-size: 0.95rem; opacity: 0.9; }

.method-section { font-size: 0.85rem; color: var(--muted-text); }

@media (max-width: 768px) {
    header { flex-direction: column; align-items: flex-start; gap: 10px; }
    .header-controls { width: 100%; justify-content: space-between; flex-wrap: wrap; }
    .kpi-section { grid-template-columns: repeat(2, 1fr); }
}