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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

h1 {
    color: white;
    font-size: 2.5em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    margin-bottom: 10px;
}

.upload-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.upload-area {
    position: relative;
    border: 3px dashed #667eea;
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    background: #f8f9ff;
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.upload-area:hover {
    border-color: #764ba2;
    background: #f0f2ff;
}

.upload-area.dragover {
    border-color: #28a745;
    background: #e8f5e8;
}

input[type="file"] {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-label {
    display: block;
    cursor: pointer;
}

.upload-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.upload-text {
    font-size: 1.2em;
    color: #667eea;
    font-weight: 500;
}

.file-list {
    margin-bottom: 20px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #f8f9fa;
    padding: 10px 15px;
    margin-bottom: 8px;
    border-radius: 5px;
    border-left: 4px solid #667eea;
}

.file-name {
    font-weight: 500;
}

.remove-file {
    color: #dc3545;
    cursor: pointer;
    font-weight: bold;
}

.process-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 25px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.process-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.process-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.sample-btn {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    box-shadow: 0 4px 15px rgba(67, 233, 123, 0.4);
}

.sample-btn:hover:not(:disabled) {
    box-shadow: 0 6px 20px rgba(67, 233, 123, 0.6);
}

.dashboard-section {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
}

.stat-card:nth-child(2) {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
}

.stat-card:nth-child(3) {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    box-shadow: 0 4px 15px rgba(67, 233, 123, 0.3);
}

.stat-card h3 {
    font-size: 0.9em;
    margin-bottom: 10px;
    opacity: 0.9;
}

.stat-value {
    font-size: 2.5em;
    font-weight: bold;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
}

.chart-container {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

.chart-container h3 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
    font-size: 1.2em;
}

canvas {
    max-width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    h1 {
        font-size: 2em;
    }

    .upload-section {
        padding: 20px;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}