body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 0.5rem 0;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

nav h1 {
    color: #fff;
    text-decoration: none;
    font-size: 2rem;
}

nav p {
    margin: 0;
    font-size: 1.1rem;
    opacity: 0.9;
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

section {
    background: #fff;
    margin-bottom: 2rem;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h2, h3 {
    color: #333;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.5rem;
}

.input-group {
    margin-bottom: 2rem;
}

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

textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    resize: vertical;
    transition: border-color 0.3s;
}

textarea:focus {
    outline: none;
    border-color: #667eea;
}

.output-section {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.hash-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.hash-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.hash-label {
    font-weight: bold;
    color: #667eea;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.hash-value {
    word-break: break-all;
    font-family: monospace;
    background: #fff;
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: background 0.3s;
}

.hash-value:hover {
    background: #e9ecef;
}

.copy-btn {
    background: #28a745;
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.3s;
}

.copy-btn:hover {
    background: #218838;
}

.copy-btn.copied {
    background: #ffc107;
    color: #333;
}

footer {
    text-align: center;
    padding: 1rem;
    background: #333;
    color: #fff;
    margin-top: 2rem;
}

footer a {
    color: #fff;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 600px) {
    .hash-grid {
        grid-template-columns: 1fr;
    }
    
    main {
        padding: 0 0.5rem;
    }
    
    section {
        padding: 1rem;
    }
}