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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e0e0e0;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2c3e50;
}

header p {
    font-size: 1rem;
    color: #666;
}

main {
    margin-bottom: 40px;
}

.flash-messages {
    margin-bottom: 30px;
}

.flash-message {
    padding: 15px 20px;
    border-radius: 4px;
    margin-bottom: 10px;
}

.flash-message.error {
    background-color: #fee;
    border: 1px solid #fcc;
    color: #c33;
}

.upload-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #2c3e50;
}

.form-group input[type="file"],
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input[type="file"]:focus,
.form-group input[type="number"]:focus,
.form-group select:focus {
    outline: none;
    border-color: #3498db;
}

.form-group small {
    display: block;
    margin-top: 5px;
    font-size: 0.875rem;
    color: #666;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.btn-primary,
.btn-download {
    display: inline-block;
    padding: 12px 30px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background-color 0.3s;
}

.btn-primary:hover,
.btn-download:hover {
    background-color: #2980b9;
}

.btn-primary {
    width: 100%;
    margin-top: 10px;
}

.results {
    max-width: 900px;
    margin: 0 auto;
}

.plot-section {
    margin-bottom: 50px;
    text-align: center;
}

.plot-section h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #2c3e50;
}

.plot-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 15px;
}

.btn-download {
    margin-bottom: 10px;
}

.actions {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
}

.actions .btn-primary {
    width: auto;
    min-width: 250px;
}

footer {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    header h1 {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .plot-image {
        max-width: 100%;
    }
}