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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #0f1923;
    color: #e0e0e0;
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, #1a2a3a 0%, #0d2137 100%);
    border-bottom: 2px solid #2196F3;
    padding: 24px 40px;
}

header h1 {
    font-size: 28px;
    font-weight: 700;
    color: #fff;
}

header p {
    color: #90a4ae;
    margin-top: 4px;
    font-size: 14px;
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 40px;
}

.upload-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.upload-box {
    background: #1a2a3a;
    border: 2px dashed #2196F3;
    border-radius: 16px;
    padding: 60px 80px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-box:hover {
    border-color: #64b5f6;
    background: #1e3348;
}

.upload-icon {
    font-size: 64px;
    margin-bottom: 16px;
}

.upload-box h2 {
    font-size: 24px;
    color: #fff;
    margin-bottom: 8px;
}

.upload-box p {
    color: #90a4ae;
    margin-bottom: 20px;
}

.upload-box button {
    background: #2196F3;
    color: #fff;
    border: none;
    padding: 14px 32px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.upload-box button:hover {
    background: #1976D2;
}

.hint {
    font-size: 12px !important;
    color: #607d8b !important;
    margin-top: 16px !important;
}

.dashboard.hidden {
    display: none;
}

.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: #1a2a3a;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    border: 1px solid #263545;
}

.stat-value {
    font-size: 36px;
    font-weight: 700;
    color: #2196F3;
}

.stat-label {
    font-size: 13px;
    color: #90a4ae;
    margin-top: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.charts-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.chart-card {
    background: #1a2a3a;
    border-radius: 12px;
    padding: 24px;
    border: 1px solid #263545;
}

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

.chart-card h3 {
    font-size: 16px;
    color: #fff;
    margin-bottom: 16px;
}

.tables-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 20px;
}

.table-card {
    background: #1a2a3a;
    border-radius: 12px;
    padding: 24px;
    border: 1px solid #263545;
}

.table-card.full-width {
    margin-bottom: 20px;
}

.table-card h3 {
    font-size: 16px;
    color: #fff;
    margin-bottom: 16px;
}

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

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 12px 16px;
    background: #0f1923;
    color: #90a4ae;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #263545;
}

td {
    padding: 12px 16px;
    border-bottom: 1px solid #1e2d3d;
    font-size: 14px;
}

tr:hover td {
    background: #1e3348;
}

.status-completed {
    color: #4caf50;
    font-weight: 600;
}

.status-in-progress {
    color: #ff9800;
    font-weight: 600;
}

.status-not-started {
    color: #f44336;
    font-weight: 600;
}

@media (max-width: 900px) {
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
    .charts-row,
    .tables-row {
        grid-template-columns: 1fr;
    }
    main {
        padding: 20px;
    }
}