:root {
    /* Color Palette - Professional Library Theme */
    --primary-color: #2c5f7c;
    --primary-dark: #1a3d52;
    --primary-light: #4a8fb8;
    --accent-color: #ff6b6b;
    --accent-hover: #ff5252;
    --success-color: #51cf66;
    --warning-color: #ffd43b;
    --danger-color: #ff6b6b;

    /* Neutral Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    --border-color: #dee2e6;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 16px rgba(44, 95, 124, 0.15);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-lg);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) translateX(0);
    }

    50% {
        transform: translateY(-20px) translateX(10px);
    }
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.header-auth {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.admin-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    background: white;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.admin-link:hover {
    background: var(--primary-light);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.login-btn-header {
    padding: 0.5rem 1.2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.login-btn-header:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.header-title {
    color: var(--primary-color);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0;
    letter-spacing: 1px;
    position: relative;
    z-index: 1;
}

.header-description {
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0.95;
    max-width: 900px;
    position: relative;
    z-index: 1;
    font-weight: 300;
}

/* Tab Navigation */
.tab-nav {
    display: flex;
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
    padding: 0;
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    font-family: 'Noto Sans TC', sans-serif;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.tab-btn:hover {
    background: rgba(44, 95, 124, 0.05);
    color: var(--primary-color);
}

.tab-btn.active {
    color: var(--primary-color);
    font-weight: 600;
}

.tab-btn.active::after {
    transform: scaleX(1);
}

/* Tab Content */
.tab-content-wrapper {
    padding: var(--spacing-xl);
    min-height: 600px;
}

.tab-content {
    display: none;
    animation: fadeIn var(--transition-base);
}

.tab-content.active {
    display: block;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Annual Selection - Book List */
.books-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.book-item {
    display: grid;
    grid-template-columns: 40px 180px 280px 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--primary-color);
    transition: all var(--transition-base);
    position: relative;
}

.book-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateX(4px);
}

.book-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: var(--spacing-sm);
}

.book-cover {
    width: 180px;
    height: 240px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
}

.book-item:hover .book-cover {
    transform: scale(1.05);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.book-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.book-meta {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.book-meta span {
    color: var(--text-primary);
    font-weight: 500;
}

.book-description {
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-md);
    overflow-y: auto;
    max-height: 240px;
}

.book-description h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.book-description p {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    text-align: justify;
}

/* Buttons */
.btn-borrow,
.btn-borrow-disabled,
.btn-search,
.btn-renew,
.btn-return,
.btn-extend,
.btn-review,
.btn-link {
    padding: var(--spacing-xs) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: 'Noto Sans TC', sans-serif;
    margin-top: var(--spacing-sm);
}

.btn-borrow,
.btn-borrow-disabled {
    max-width: 120px;
    width: 100%;
}

.btn-borrow {
    background: var(--accent-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-borrow:hover {
    background: var(--accent-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-borrow-disabled {
    background: var(--text-muted);
    color: white;
    cursor: not-allowed;
}

.btn-search {
    background: var(--warning-color);
    color: var(--text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-weight: 600;
}

.btn-search:hover {
    background: #ffc107;
    transform: translateY(-2px);
}

/* Search Bar */
.search-bar {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

#search-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: 'Noto Sans TC', sans-serif;
    transition: all var(--transition-base);
}

#search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 95, 124, 0.1);
}

/* View Toggle */
.view-toggle {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: flex-end;
    margin-bottom: var(--spacing-lg);
}

.view-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: 'Noto Sans TC', sans-serif;
}

.view-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-light);
    color: var(--primary-color);
}

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

.view-btn svg {
    flex-shrink: 0;
}

/* Historical Books - Grid Layout */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    transition: all var(--transition-base);
}

/* Historical Books - List Layout */
.books-grid.list-view {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.books-grid.list-view .book-card {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--spacing-md);
}

.books-grid.list-view .book-card-cover {
    width: 180px;
    height: 240px;
}

.books-grid.list-view .book-card:hover {
    transform: translateX(4px);
}

.books-grid.list-view .book-card-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.book-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-8px);
}

.book-card-cover {
    width: 100%;
    height: 240px;
    overflow: hidden;
    background: var(--bg-tertiary);
    position: relative;
}

.book-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.book-card:hover .book-card-cover img {
    transform: scale(1.1);
}

.book-card-info {
    padding: var(--spacing-md);
}

.book-card-info h4 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.book-card-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.book-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(44, 95, 124, 0.9);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
}

/* My Borrowing Section */
.borrowing-info {
    background: linear-gradient(135deg, #fff5e6 0%, #ffe8cc 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid var(--warning-color);
}

.borrowing-info h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.borrowing-info ol {
    padding-left: var(--spacing-lg);
}

.borrowing-info li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    line-height: 1.8;
}

.borrowing-info strong {
    color: var(--accent-color);
    font-weight: 600;
}

.borrowing-records h3,
.borrowing-history h3 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.highlight {
    color: var(--accent-color);
    font-weight: 700;
}

.borrowing-record {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.borrowing-record:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.record-header {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.record-number {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
}

.record-book-info {
    font-size: 1.05rem;
    color: var(--text-primary);
}

.record-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.record-field {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.field-label {
    font-weight: 500;
}

.field-value {
    color: var(--text-primary);
}

.record-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.btn-renew,
.btn-return,
.btn-extend,
.btn-review {
    padding: 0.4rem 0.9rem;
    font-size: 0.85rem;
    margin-top: 0;
}

.btn-renew {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.status-warning {
    background: var(--danger-color);
    color: white;
}

.status-due-soon {
    background: var(--warning-color);
    color: var(--text-primary);
}

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

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

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

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

.btn-review:hover {
    background: var(--accent-hover);
}

.overdue-notice {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: #ffe0e0;
    color: var(--danger-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
}

/* History Table */
.borrowing-history {
    margin-top: var(--spacing-xl);
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.history-table thead {
    background: var(--primary-color);
    color: white;
}

.history-table th {
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
}

.history-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.history-table tbody tr:hover {
    background: var(--bg-secondary);
}

.history-table tbody tr:last-child td {
    border-bottom: none;
}

.btn-link {
    background: transparent;
    color: var(--accent-color);
    padding: 0;
    margin: 0;
    text-decoration: underline;
    font-size: 0.9rem;
}

.btn-link:hover {
    color: var(--accent-hover);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .book-item {
        grid-template-columns: 40px 150px 240px 1fr;
    }

    .book-cover {
        width: 150px;
        height: 200px;
    }

    .book-description {
        max-height: 200px;
    }
}

@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .header-title {
        font-size: 1.5rem;
    }

    .header-description {
        font-size: 0.85rem;
    }

    .tab-btn {
        font-size: 0.9rem;
        padding: var(--spacing-sm) var(--spacing-xs);
    }

    .tab-content-wrapper {
        padding: var(--spacing-md);
    }

    .book-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .book-number {
        position: absolute;
        top: var(--spacing-md);
        left: var(--spacing-md);
        background: var(--primary-color);
        color: white;
        width: 35px;
        height: 35px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        z-index: 2;
    }

    .book-cover {
        width: 100%;
        height: 300px;
    }

    .book-description {
        grid-column: 1;
    }

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

    .books-grid.list-view .book-card {
        grid-template-columns: 120px 1fr;
        gap: var(--spacing-sm);
    }

    .books-grid.list-view .book-card-cover {
        width: 120px;
        height: 160px;
    }

    .search-bar {
        flex-direction: column;
    }

    .view-toggle {
        justify-content: center;
    }

    .record-details {
        flex-direction: column;
        align-items: flex-start;
    }

    .history-table {
        font-size: 0.8rem;
    }

    .history-table th,
    .history-table td {
        padding: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .header-title {
        font-size: 1.2rem;
    }

    .tab-btn {
        font-size: 0.8rem;
    }
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    animation: modalFadeIn var(--transition-base);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    animation: overlayFadeIn var(--transition-base);
}

.modal-container {
    position: relative;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn var(--transition-base);
    z-index: 1001;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
    line-height: 1;
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Book Preview in Modal */
.book-preview {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid var(--primary-color);
}

.book-preview-cover {
    width: 80px;
    height: 110px;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    flex-shrink: 0;
}

.book-preview-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-preview-info {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.book-preview-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.book-preview-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Form Styles */
.borrow-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-label {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.label-required {
    color: var(--accent-color);
    font-weight: 600;
}

.form-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Noto Sans TC', sans-serif;
    transition: all var(--transition-base);
    background: white;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 95, 124, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
}

.form-input:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

.form-info {
    background: linear-gradient(135deg, #fff5e6 0%, #ffe8cc 100%);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--warning-color);
}

.form-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.form-info p:last-child {
    margin-bottom: 0;
}

.form-info strong {
    color: var(--accent-color);
    font-weight: 600;
}

/* Modal Footer */
.modal-footer {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.btn-modal-cancel,
.btn-modal-submit {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: 'Noto Sans TC', sans-serif;
    min-width: 100px;
}

.btn-modal-cancel {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-modal-cancel:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-modal-submit {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-modal-submit:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-modal-submit:active {
    transform: translateY(0);
}

/* Modal Animations */
@keyframes modalFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes overlayFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Modal Responsive Design */
@media (max-width: 768px) {
    .modal-container {
        width: 95%;
        max-height: 95vh;
    }

    .modal-header {
        padding: var(--spacing-md);
    }

    .modal-title {
        font-size: 1.2rem;
    }

    .modal-body {
        padding: var(--spacing-md);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .book-preview {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .book-preview-cover {
        width: 120px;
        height: 160px;
    }

    .modal-footer {
        flex-direction: column-reverse;
    }

    .btn-modal-cancel,
    .btn-modal-submit {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .modal-container {
        width: 100%;
        max-height: 100vh;
        border-radius: 0;
    }

    .modal-header {
        border-radius: 0;
    }
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 320px;
    max-width: 450px;
    z-index: 2000;
    transform: translateX(500px);
    opacity: 0;
    transition: all var(--transition-base);
}

.notification.show {
    transform: translateX(0);
    opacity: 1;
}

.notification-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

.notification-success .notification-icon {
    background: linear-gradient(135deg, #51cf66 0%, #40c057 100%);
    color: white;
}

.notification-error .notification-icon {
    background: linear-gradient(135deg, #ff6b6b 0%, #ff5252 100%);
    color: white;
}

.notification-info .notification-icon {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.notification-content {
    flex: 1;
}

.notification-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.notification-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.notification-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.notification-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .notification {
        top: 10px;
        right: 10px;
        left: 10px;
        min-width: auto;
        max-width: none;
    }
}