/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --green-dark:   #1a3a2a;
    --green-mid:    #2d6a4f;
    --green-light:  #52b788;
    --cream:        #fdf8f0;
    --cream-dark:   #f0e9d8;
    --text-dark:    #1c1c1c;
    --text-muted:   #5a5a5a;
    --gold:         #c9a84c;
    --red:          #b94040;
    --shadow:       0 4px 20px rgba(0,0,0,0.12);
    --radius:       10px;
    --transition:   0.25s ease;
}

body {
    font-family: 'Georgia', serif;
    background-color: var(--cream);
    color: var(--text-dark);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ===== Navbar ===== */
nav {
    background-color: var(--green-dark);
    color: #fff;
    padding: 0 2rem;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.nav-brand {
    font-size: 1.4rem;
    font-weight: bold;
    letter-spacing: 0.5px;
    color: var(--gold);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-brand span {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-links a {
    color: #ddd;
    font-size: 0.95rem;
    transition: color var(--transition);
    font-family: 'Arial', sans-serif;
}

.nav-links a:hover {
    color: var(--gold);
}

.nav-links .btn-nav {
    background-color: var(--green-light);
    color: #fff;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: background-color var(--transition);
}

.nav-links .btn-nav:hover {
    background-color: var(--green-mid);
    color: #fff;
}

.nav-links .btn-logout {
    background-color: transparent;
    border: 1px solid #aaa;
    color: #ddd;
    padding: 0.35rem 0.9rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition);
    font-family: 'Arial', sans-serif;
}

.nav-links .btn-logout:hover {
    border-color: var(--gold);
    color: var(--gold);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.7rem 1.6rem;
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: 'Arial', sans-serif;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    font-weight: 600;
}

.btn-primary {
    background-color: var(--green-mid);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--green-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background-color: transparent;
    color: var(--green-mid);
    border: 2px solid var(--green-mid);
}

.btn-secondary:hover {
    background-color: var(--green-mid);
    color: #fff;
}

.btn-gold {
    background-color: var(--gold);
    color: #fff;
}

.btn-gold:hover {
    background-color: #a8872e;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.85rem;
    border-radius: 6px;
}

.btn-danger {
    background-color: var(--red);
    color: #fff;
}

.btn-danger:hover {
    background-color: #8b2e2e;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--green-dark) 0%, var(--green-mid) 100%);
    color: #fff;
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background-color: rgba(201, 168, 76, 0.25);
    color: var(--gold);
    border: 1px solid var(--gold);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    font-family: 'Arial', sans-serif;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    line-height: 1.15;
}

.hero h1 em {
    color: var(--gold);
    font-style: normal;
}

.hero p {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.82);
    margin-bottom: 2.5rem;
    line-height: 1.7;
    font-family: 'Arial', sans-serif;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ===== Features Section ===== */
.section {
    padding: 4rem 2rem;
}

.section-title {
    text-align: center;
    font-size: 1.9rem;
    color: var(--green-dark);
    margin-bottom: 0.5rem;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 3rem;
    font-family: 'Arial', sans-serif;
    font-size: 0.95rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--green-light);
    transition: transform var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--green-dark);
    margin-bottom: 0.6rem;
    font-size: 1.1rem;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
}

/* ===== Stats Bar ===== */
.stats-bar {
    background-color: var(--green-dark);
    color: #fff;
    padding: 2.5rem 2rem;
}

.stats-inner {
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.stat-item .number {
    font-size: 2.2rem;
    font-weight: bold;
    color: var(--gold);
    display: block;
}

.stat-item .label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.7);
    font-family: 'Arial', sans-serif;
    margin-top: 0.2rem;
}

/* ===== CTA Banner ===== */
.cta-banner {
    background-color: var(--cream-dark);
    border-top: 1px solid #ddd;
    border-bottom: 1px solid #ddd;
    padding: 3rem 2rem;
    text-align: center;
}

.cta-banner h2 {
    font-size: 1.8rem;
    color: var(--green-dark);
    margin-bottom: 0.8rem;
}

.cta-banner p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-family: 'Arial', sans-serif;
}

/* ===== Footer ===== */
footer {
    margin-top: auto;
    background-color: var(--green-dark);
    color: rgba(255,255,255,0.6);
    text-align: center;
    padding: 1.5rem 2rem;
    font-family: 'Arial', sans-serif;
    font-size: 0.85rem;
}

footer a {
    color: var(--gold);
}

/* ===== Catalogue Page ===== */
.catalogue-header {
    background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
    color: #fff;
    padding: 3rem 2rem 2.5rem;
}

.catalogue-header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.4rem;
}

.catalogue-header p {
    color: rgba(255,255,255,0.75);
    font-family: 'Arial', sans-serif;
    font-size: 0.95rem;
}

.catalogue-body {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

/* Search / Filter Bar */
.search-bar {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem 1.5rem;
    margin-bottom: 2rem;
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.search-bar label {
    font-size: 0.8rem;
    font-family: 'Arial', sans-serif;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.search-group {
    display: flex;
    flex-direction: column;
}

.search-group.grow {
    flex: 1;
    min-width: 180px;
}

.search-bar select,
.search-bar input[type="text"] {
    padding: 0.55rem 0.85rem;
    border: 1.5px solid #d0c9be;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: 'Arial', sans-serif;
    background: var(--cream);
    color: var(--text-dark);
    transition: border-color var(--transition);
    outline: none;
}

.search-bar select:focus,
.search-bar input[type="text"]:focus {
    border-color: var(--green-light);
}

.filter-pills {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    align-items: center;
}

.filter-pills span {
    font-size: 0.85rem;
    font-family: 'Arial', sans-serif;
    color: var(--text-muted);
    margin-right: 0.25rem;
}

.pill {
    padding: 0.3rem 0.85rem;
    border-radius: 20px;
    border: 1.5px solid var(--cream-dark);
    background: #fff;
    font-size: 0.82rem;
    font-family: 'Arial', sans-serif;
    cursor: pointer;
    transition: all var(--transition);
    color: var(--text-dark);
}

.pill:hover,
.pill.active {
    background-color: var(--green-mid);
    border-color: var(--green-mid);
    color: #fff;
}

/* Book Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.book-card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    border: 1px solid rgba(0,0,0,0.06);
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.book-card-spine {
    height: 6px;
    background: var(--green-mid);
}

.book-card.unavailable .book-card-spine {
    background: var(--red);
}

.book-card-body {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-genre-badge {
    display: inline-block;
    background-color: var(--cream-dark);
    color: var(--green-dark);
    font-size: 0.72rem;
    font-family: 'Arial', sans-serif;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    margin-bottom: 0.6rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.book-title {
    font-size: 1.05rem;
    font-weight: bold;
    color: var(--green-dark);
    margin-bottom: 0.2rem;
    line-height: 1.3;
}

.book-author {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-family: 'Arial', sans-serif;
    margin-bottom: 0.75rem;
    font-style: italic;
}

.book-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'Arial', sans-serif;
    line-height: 1.55;
    flex: 1;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.book-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--cream-dark);
    padding-top: 0.85rem;
    margin-top: auto;
    gap: 0.5rem;
}

.availability-badge {
    font-size: 0.78rem;
    font-family: 'Arial', sans-serif;
    font-weight: 600;
    padding: 0.25rem 0.65rem;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.availability-badge.available {
    background-color: #d4edda;
    color: #145523;
}

.availability-badge.unavailable {
    background-color: #f8d7da;
    color: #7a1c1c;
}

.book-format {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'Arial', sans-serif;
}

.book-actions {
    padding: 0 1.25rem 1.25rem;
    display: flex;
    gap: 0.5rem;
}

/* Loading / Empty States */
.state-box {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
    font-family: 'Arial', sans-serif;
}

.state-box .state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.state-box p {
    font-size: 1rem;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 999;
}

.toast {
    background: var(--green-dark);
    color: #fff;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-family: 'Arial', sans-serif;
    font-size: 0.9rem;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s ease, fadeOut 0.4s ease 2.6s forwards;
    max-width: 300px;
}

.toast.error {
    background: var(--red);
}

@keyframes slideIn {
    from { transform: translateX(120%); opacity: 0; }
    to   { transform: translateX(0);   opacity: 1; }
}

@keyframes fadeOut {
    to { opacity: 0; transform: translateX(120%); }
}

/* ISBN tag */
.isbn-tag {
    font-size: 0.72rem;
    color: #999;
    font-family: 'Arial', sans-serif;
    margin-top: 0.25rem;
}

/* Responsive */
@media (max-width: 600px) {
    .hero h1 { font-size: 2rem; }
    .stats-inner { gap: 2rem; }
    nav { padding: 0 1rem; }
    .search-bar { flex-direction: column; }
}

/* ===== Management Pages (Librarian / Admin / Owner) ===== */

/* Shared page header */
.panel-header {
    background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
    color: #fff;
    padding: 2.5rem 2rem 2rem;
}
.panel-header h1 { font-size: 2rem; margin-bottom: 0.4rem; }
.panel-header p  { color: rgba(255,255,255,0.75); font-family:'Arial',sans-serif; font-size:0.95rem; }

.panel-body {
    max-width: 1280px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

/* Tabs */
.tabs { display:flex; border-bottom:2px solid var(--cream-dark); margin-bottom:2rem; }

.tab-btn {
    padding: 0.7rem 1.5rem;
    border: none;
    background: transparent;
    font-family: 'Arial', sans-serif;
    font-size: 0.95rem;
    cursor: pointer;
    color: var(--text-muted);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    font-weight: 600;
    transition: all var(--transition);
}
.tab-btn.active         { color: var(--green-dark); border-bottom-color: var(--green-mid); }
.tab-btn:hover:not(.active) { color: var(--green-mid); }

.tab-pane        { display: none; }
.tab-pane.active { display: block; }

/* Toolbar above each table */
.table-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}
.table-toolbar h2 { font-size: 1.15rem; color: var(--green-dark); }

/* Spreadsheet / Excel-like table */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid #c8bfad;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    font-family: 'Arial', sans-serif;
    font-size: 0.875rem;
}

.data-table thead th {
    background: var(--green-dark);
    color: #fff;
    padding: 0.7rem 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    white-space: nowrap;
    border-right: 1px solid rgba(255,255,255,0.12);
    user-select: none;
}
.data-table thead th:last-child { border-right: none; text-align: center; }

.data-table tbody td {
    padding: 0.6rem 1rem;
    border-bottom: 1px solid #e4ddd1;
    border-right: 1px solid #e4ddd1;
    color: var(--text-dark);
    white-space: nowrap;
    max-width: 260px;
    overflow: hidden;
    text-overflow: ellipsis;
}
.data-table tbody td:last-child { border-right: none; text-align: center; white-space: nowrap; }

.data-table tbody tr:nth-child(even) { background: #f7f3ec; }
.data-table tbody tr:hover           { background: #dff0e8; }

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

.table-empty {
    text-align: center !important;
    padding: 2.5rem !important;
    color: var(--text-muted);
    font-style: italic;
}
.table-loading {
    text-align: center !important;
    padding: 1.5rem !important;
    color: var(--text-muted);
}

/* Status / availability badge inside table */
.status-badge {
    display: inline-block;
    padding: 0.18rem 0.55rem;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.status-badge.avail   { background: #d4edda; color: #145523; }
.status-badge.checked { background: #f8d7da; color: #7a1c1c; }

/* Role badges */
.role-badge {
    display: inline-block;
    padding: 0.18rem 0.6rem;
    border-radius: 12px;
    font-size: 0.72rem;
    font-family: 'Arial', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    white-space: nowrap;
}
.role-badge.USER      { background: #d4edda; color: #145523; }
.role-badge.LIBRARIAN { background: #cce5ff; color: #004085; }
.role-badge.ADMIN     { background: #fff3cd; color: #856404; }
.role-badge.OWNER     { background: #f8d7da; color: #721c24; }

/* ── Add-form pages ── */
.form-page {
    max-width: 640px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
}

.form-card {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2rem 2.25rem;
    border-top: 4px solid var(--green-mid);
}

.form-card h2 {
    color: var(--green-dark);
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--cream-dark);
}

.form-group { margin-bottom: 1.1rem; }

.form-label {
    display: block;
    font-size: 0.78rem;
    font-family: 'Arial', sans-serif;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border: 1.5px solid #d0c9be;
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: 'Arial', sans-serif;
    background: var(--cream);
    color: var(--text-dark);
    outline: none;
    transition: border-color var(--transition);
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus { border-color: var(--green-light); }

.form-textarea { resize: vertical; min-height: 90px; }

.form-checkbox-row { display:flex; align-items:center; gap:0.5rem; }
.form-checkbox-row input[type="checkbox"] { width:16px; height:16px; cursor:pointer; accent-color:var(--green-mid); }
.form-checkbox-row label { font-family:'Arial',sans-serif; font-size:0.9rem; color:var(--text-dark); cursor:pointer; }

.form-actions { margin-top:1.5rem; display:flex; gap:0.75rem; align-items:center; }

/* ── Confirmation / Role-change Modal ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
}
.modal-overlay.open {
    opacity: 1;
    pointer-events: all;
}
.modal-box {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: 0 8px 40px rgba(0,0,0,0.22);
    padding: 2rem 2.25rem;
    max-width: 420px;
    width: 90%;
    transform: translateY(-16px);
    transition: transform var(--transition);
}
.modal-overlay.open .modal-box { transform: translateY(0); }

.modal-box h3    { color: var(--green-dark); font-size: 1.1rem; margin-bottom: 0.6rem; }
.modal-box p     { color: var(--text-muted); font-family:'Arial',sans-serif; font-size:0.9rem; line-height:1.5; margin-bottom:1.4rem; }
.modal-actions   { display:flex; gap:0.75rem; justify-content:flex-end; }

.modal-box .form-select { margin-bottom: 1.4rem; }

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.4rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

.page-btn {
    min-width: 38px;
    height: 38px;
    padding: 0 0.6rem;
    border-radius: 6px;
    border: 1.5px solid var(--cream-dark);
    background: #fff;
    font-family: 'Arial', sans-serif;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--text-dark);
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    white-space: nowrap;
}

.page-btn:hover:not(:disabled):not(.active) {
    background: var(--cream-dark);
    border-color: var(--green-light);
}

.page-btn.active {
    background: var(--green-mid);
    border-color: var(--green-mid);
    color: #fff;
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.page-ellipsis {
    font-family: 'Arial', sans-serif;
    font-size: 0.9rem;
    color: var(--text-muted);
    padding: 0 0.2rem;
    user-select: none;
}

/* ===== Book Detail Modal ===== */
.book-detail-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.52);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 600;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    padding: 1rem;
}

.book-detail-overlay.open {
    opacity: 1;
    pointer-events: all;
}

.book-detail-box {
    background: #fff;
    border-radius: var(--radius);
    box-shadow: 0 8px 40px rgba(0,0,0,0.28);
    max-width: 580px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    transition: transform var(--transition);
}

.book-detail-overlay.open .book-detail-box {
    transform: translateY(0);
}

.book-detail-header {
    background: linear-gradient(135deg, var(--green-dark), var(--green-mid));
    color: #fff;
    padding: 1.5rem 2rem;
    border-radius: var(--radius) var(--radius) 0 0;
    position: relative;
}

.book-detail-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255,255,255,0.15);
    border: none;
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.book-detail-close:hover {
    background: rgba(255,255,255,0.3);
}

.book-detail-body {
    padding: 1.75rem 2rem;
}

.book-detail-field {
    margin-bottom: 1.1rem;
}

.book-detail-label {
    font-size: 0.72rem;
    font-family: 'Arial', sans-serif;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.25rem;
}

.book-detail-value {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-family: 'Arial', sans-serif;
    line-height: 1.55;
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1.5rem;
}

.book-detail-divider {
    border: none;
    border-top: 1px solid var(--cream-dark);
    margin: 1.25rem 0;
}

.book-detail-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}