:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
}

.dashboard {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--card-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-header h2 {
    font-size: 1.25rem;
    color: var(--accent);
    margin-bottom: 2rem;
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    border-radius: 0.5rem;
    cursor: pointer;
    text-align: left;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

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

.sidebar-footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 2px solid var(--accent);
}

.user-details {
    display: flex;
    flex-direction: column;
}

#userName {
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-role {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.logout-btn {
    width: 100%;
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.logout-btn:hover {
    background: #ef444422;
    border-color: #ef4444;
    color: #ef4444;
}

.main-content {
    flex: 1;
    padding: 2.5rem;
    max-width: 1600px;
}

.view-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.header-stats {
    display: flex;
    gap: 0.5rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    gap: 12px;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 10px 0 12px;
    flex-wrap: wrap;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--border);
}

.actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

input[type="text"] {
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    width: 300px;
}

.btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}

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

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

.btn.secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn.secondary:hover {
    background: var(--border);
}

.btn.ai {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
}

.btn.ai:hover {
    opacity: 0.9;
}

.btn.logout {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 1px solid var(--border);
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
}

.btn.logout:hover {
    background: #dc2626;
    border-color: #dc2626;
    color: white;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 2.2rem;
    padding: 0 6px;
}

.book-card {
    background: var(--card-bg);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.book-cover {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    background: #334155;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 2rem;
}

.book-info {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-author {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.book-meta {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.book-actions {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.open-btn {
    width: 100%;
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 0.375rem;
    cursor: pointer;
}

.open-btn:hover {
    background: var(--border);
}

.gbooks-link {
    font-size: 0.75rem;
    color: var(--accent);
    text-decoration: none;
    text-align: center;
}

.gbooks-link:hover {
    text-decoration: underline;
}

.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
}

/* Filters */
.filters {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border);
}

.search-input {
    width: 100% !important;
    font-size: 1rem;
}

.advanced-filters {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

.advanced-filters input {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
}

.badge {
    font-size: 0.75em;
    background: var(--accent);
    color: white;
    padding: 4px 10px;
    border-radius: 10px;
    vertical-align: middle;
    margin-right: 8px;
}

.pagination-actions {
    text-align: center;
    padding: 20px;
    grid-column: 1 / -1;
}

#loadMoreBtn {
    padding: 6px 16px;
    font-size: 13px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 2rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-color);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
}

.form-actions {
    text-align: right;
    margin-top: 1.5rem;
}

/* Info Button */
.info-btn {
    width: 100%;
    padding: 0.5rem;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 0.375rem;
    cursor: pointer;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.info-btn:hover {
    background: var(--border);
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 80px;
        padding: 1rem 0.5rem;
    }
    .sidebar-header h2, .user-details, .nav-btn span, .logout-btn span {
        display: none;
    }
    .nav-btn {
        justify-content: center;
        padding: 0.75rem;
    }
}

@media (max-width: 768px) {
    .dashboard {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 1rem;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }
    .main-content {
        padding: 1.5rem;
    }
}