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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #000000 0%, #1a1a1a 100%);
    min-height: 100vh;
    padding: 20px;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: #2a2a2a;
    padding: 20px 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

h1 {
    color: #e0e0e0;
    font-size: 2rem;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.btn-primary {
    background: #4a4a4a;
    color: white;
}

.btn-primary:hover {
    background: #3a3a3a;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

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

.btn-danger {
    background: #dc3545;
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-danger:hover {
    background: #c82333;
}

.btn-success {
    background: #ffc107;
    color: #1a1a1a;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-success:hover {
    background: #e0a800;
}

.btn-warning {
    background: #9b59b6;
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.btn-warning:hover {
    background: #8e44ad;
}

dialog {
    border: none;
    border-radius: 10px;
    padding: 0;
    background: #2a2a2a;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    max-width: 500px;
    width: 90%;
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0.7);
}

dialog form {
    padding: 30px;
}

dialog h2 {
    margin-bottom: 20px;
    color: #e0e0e0;
}

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

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #e0e0e0;
    font-weight: 600;
}

.form-group input[type="text"],
.form-group input[type="number"] {
    width: 100%;
    padding: 10px;
    background: #1a1a1a;
    color: #e0e0e0;
    border: 2px solid #444;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input[type="text"]:focus,
.form-group input[type="number"]:focus {
    outline: none;
    border-color: #666666;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 10px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.form-buttons {
    display: flex;
    gap: 10px;
    margin-top: 25px;
}

.form-buttons button {
    flex: 1;
}

.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.book-card {
    background: #2a2a2a;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.5);
}

.book-card h3 {
    color: #e0e0e0;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.book-card p {
    color: #b0b0b0;
    margin-bottom: 8px;
}

.book-card .book-info {
    margin-bottom: 15px;
}

.book-card .read-status {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.book-card .read-status.read {
    background: #3a3a3a;
    color: #b0b0b0;
}

.book-card .read-status.not-read {
    background: #1a1a1a;
    color: #808080;
}

.book-card .card-buttons {
    display: flex;
    gap: 10px;
}

.book-card .card-buttons button {
    flex: 1;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: #2a2a2a;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.empty-state h2 {
    color: #b0b0b0;
    margin-bottom: 10px;
}

.empty-state p {
    color: #808080;
}