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

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    color: white;
}

header h1 {
    font-size: 3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

.converter {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.input-section {
    display: flex;
    gap: 1.5rem;
    align-items: end;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 250px;
}

.base-selector {
    min-width: 200px;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #555;
}

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

input:focus, select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#convert-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

#convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

#convert-btn:active {
    transform: translateY(0);
}

.results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.result-card {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 1.5rem;
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.result-card h3 {
    color: #495057;
    margin-bottom: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.result-value {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: #212529;
    border: 1px solid #dee2e6;
    margin-bottom: 1rem;
    word-break: break-all;
    min-height: 3rem;
    display: flex;
    align-items: center;
}

.copy-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.copy-btn:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

.copy-btn.copied {
    background: #28a745;
}

.info-section {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.info-section h2 {
    color: #495057;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    font-weight: 600;
}

.info-section ul {
    list-style: none;
    margin-bottom: 2rem;
}

.info-section li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.info-section li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

.examples h3 {
    color: #495057;
    margin-bottom: 1rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.example {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .converter {
        padding: 1.5rem;
    }

    .input-section {
        flex-direction: column;
        align-items: stretch;
    }

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

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

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    header p {
        font-size: 1rem;
    }

    .converter {
        padding: 1rem;
    }

    .info-section {
        padding: 1.5rem;
    }
}