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

:root {
    --primary-color: #4a5dff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --background: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #333;
    --border-color: #dee2e6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    flex: 1;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary-color);
}

header p {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

header a {
    color: var(--primary-color);
    text-decoration: none;
}

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

.card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.card h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--secondary-color);
    font-size: 0.875rem;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: #3a4dff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 93, 255, 0.3);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}

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

.result {
    margin-top: 30px;
    padding: 20px;
    background: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 5px;
}

.result h3 {
    color: var(--success-color);
    margin-bottom: 15px;
}

.link-container {
    display: flex;
    gap: 10px;
    margin: 15px 0;
}

.link-container input {
    flex: 1;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-family: monospace;
    background: white;
}

.expiry-info {
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-top: 10px;
}

.secret-display {
    background: #f8f9fa;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    padding: 20px;
    margin: 20px 0;
    word-wrap: break-word;
}

.secret-display pre {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'Courier New', monospace;
    font-size: 1rem;
    margin: 0;
}

.error {
    padding: 15px;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 5px;
    color: var(--danger-color);
    margin-top: 20px;
}

.warning {
    padding: 15px;
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 5px;
    color: #856404;
    margin-top: 20px;
    text-align: center;
}

.loading {
    text-align: center;
    padding: 20px;
    color: var(--primary-color);
    font-weight: 600;
}

.hidden {
    display: none !important;
}

footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-top: 40px;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .link-container {
        flex-direction: column;
    }
}