:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --gray: #95a5a6;
    --success: #2ecc71;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    margin-top: 50px;
}

header {
    background: var(--primary);
    color: white;
    padding: 20px;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    font-weight: 500;
}

.calculator {
    padding: 25px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}

input, select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
    transition: border 0.3s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary);
}

.row {
    display: flex;
    gap: 15px;
}

.col {
    flex: 1;
}

button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    transition: background 0.3s;
}

button:hover {
    background: var(--primary-dark);
}

.results {
    margin-top: 30px;
    background: #f8f9fa;
    border-radius: 5px;
    padding: 20px;
    display: none;
}

.results h2 {
    margin-bottom: 15px;
    color: var(--dark);
    font-size: 1.3rem;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
}

.result-card {
    background: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.result-card h3 {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 5px;
}

.result-card p {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--dark);
}

.compression-badge {
    display: inline-block;
    background: var(--success);
    color: white;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-left: 5px;
}

@media (max-width: 600px) {
    .row {
        flex-direction: column;
    }
    
    .result-grid {
        grid-template-columns: 1fr;
    }
}