body {
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(99,102,241,0.12) 0%, transparent 70%);
}

/* ── Top nav ── */
nav {
    position: sticky;
    top: 0;
    z-index: 20;
    height: 72px;
    background: rgba(5,8,15,0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
}

.nav-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-title);
    letter-spacing: -0.5px;
}

.nav-brand span {
    color: var(--accent);
}

.import-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16,1,0.3,1);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.import-btn:hover {
    background: #4f46e5;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

/* ── Main content ── */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 56px 48px 96px;
}

/* ── Drop zone (shown when no books or dragging) ── */
.drop-zone {
    border: 2px dashed var(--border-hover);
    border-radius: 24px;
    padding: 80px 40px;
    text-align: center;
    margin-bottom: 56px;
    transition: all 0.3s ease;
    cursor: pointer;
    display: none;
}

.drop-zone.visible { display: block; }

.drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-dim);
}

.drop-zone-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    opacity: 0.4;
}

.drop-zone h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--text-title);
    margin-bottom: 12px;
}

.drop-zone p {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 28px;
}

.drop-zone-btn {
    background: var(--accent-dim);
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 12px 28px;
    border-radius: 10px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.drop-zone-btn:hover {
    background: var(--accent);
    color: #fff;
}

/* ── Section header ── */
.section-header {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 28px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-title);
    letter-spacing: -0.5px;
}

.section-count {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ── Book card grid ── */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.book-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px;
    cursor: pointer;
    position: relative;
    transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
    overflow: hidden;
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #a78bfa);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.book-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0,0,0,0.3);
}

.book-card:hover::before { opacity: 1; }

.book-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 16px;
}

.book-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.book-delete-btn {
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.2s ease;
}

.book-card:hover .book-delete-btn { opacity: 1; }

.book-delete-btn:hover {
    background: var(--danger-dim);
    border-color: var(--danger);
    color: var(--danger);
}

.book-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-title);
    line-height: 1.3;
    margin-bottom: 6px;
}

.book-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Progress bar */
.progress-track {
    height: 4px;
    background: var(--border);
    border-radius: 99px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #a78bfa);
    border-radius: 99px;
    transition: width 0.4s ease;
}

.progress-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
}

.progress-label .chapter-current {
    color: var(--accent);
    font-weight: 600;
}

/* ── Import overlay ── */
.import-overlay {
    position: fixed;
    inset: 0;
    background: rgba(5,8,15,0.92);
    backdrop-filter: blur(16px);
    z-index: 100;
    display: none;
    align-items: flex-start;
    justify-content: center;
    overflow-y: auto;
    padding: 40px 0;
}

.import-overlay.active { display: flex; }

.import-card {
    background: #0d1120;
    border: 1px solid var(--border-hover);
    border-radius: 24px;
    padding: 48px;
    max-width: 480px;
    width: 90%;
    box-shadow: 0 40px 80px rgba(0,0,0,0.6);
    text-align: center;
    margin: auto;
}

.import-card h2 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--text-title);
    margin-bottom: 10px;
}

.import-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 28px;
}

.import-progress-wrap {
    display: none;
    flex-direction: column;
    gap: 12px;
}

.import-progress-wrap.active { display: flex; }

.import-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

.import-status {
    font-size: 0.9rem;
    color: var(--text-body);
    font-weight: 500;
}

.import-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.import-file-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 16px 32px;
    border-radius: 14px;
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.import-file-btn:hover {
    background: #4f46e5;
    box-shadow: 0 6px 20px var(--accent-glow);
}

.import-cancel-btn {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
    padding: 14px 32px;
    border-radius: 14px;
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.import-cancel-btn:hover {
    color: var(--text-title);
    border-color: var(--border-hover);
}

/* ── Import modal Tabs & Forms ── */
.import-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: rgba(255,255,255,0.02);
    padding: 4px;
    border-radius: 12px;
    border: 1px solid var(--border);
}
.import-tab {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--text-body);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}
.import-tab.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px var(--accent-glow);
}
.import-tab-content {
    display: none;
    text-align: left;
}
.import-tab-content.active {
    display: block;
}
.import-field {
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.import-field label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-title);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.import-input {
    background: rgba(0,0,0,0.2);
    border: 1px solid var(--border);
    color: var(--text-title);
    padding: 12px 16px;
    border-radius: 10px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.25s ease;
}
.import-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}
.import-advanced-btn {
    background: transparent;
    border: none;
    color: var(--accent);
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
    padding: 0;
}
.import-advanced-panel {
    display: none;
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 8px;
}
.import-advanced-panel.active {
    display: block;
}
.import-preview-box {
    background: rgba(255,255,255,0.01);
    border: 1px dashed var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-top: 16px;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}
.import-preview-box.active {
    display: block;
}
.import-preview-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-title);
    margin-bottom: 8px;
}
.import-preview-body {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    color: var(--text-body);
    line-height: 1.6;
}

/* ── Toast ── */
.toast {
    position: fixed;
    bottom: 36px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-hover);
    border-radius: 14px;
    padding: 14px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-title);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    z-index: 200;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
    pointer-events: none;
    white-space: nowrap;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── Delete confirmation modal ── */
.confirm-modal {
    position: fixed;
    inset: 0;
    background: rgba(5,8,15,0.85);
    backdrop-filter: blur(12px);
    z-index: 150;
    display: none;
    align-items: center;
    justify-content: center;
}

.confirm-modal.active { display: flex; }

.confirm-card {
    background: #0d1120;
    border: 1px solid var(--border-hover);
    border-radius: 20px;
    padding: 36px;
    max-width: 380px;
    width: 90%;
    text-align: center;
}

.confirm-card h3 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--text-title);
    margin-bottom: 10px;
}

.confirm-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 28px;
    line-height: 1.6;
}

.confirm-btns {
    display: flex;
    gap: 12px;
}

.confirm-delete-btn {
    flex: 1;
    background: var(--danger);
    color: #fff;
    border: none;
    padding: 14px;
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.confirm-delete-btn:hover { background: #dc2626; }

.confirm-cancel-btn {
    flex: 1;
    background: transparent;
    color: var(--text-body);
    border: 1px solid var(--border);
    padding: 14px;
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.confirm-cancel-btn:hover {
    color: var(--text-title);
    border-color: var(--border-hover);
}

/* ── Library Controls (Search, Filter, Sort) ── */
.library-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 32px;
    align-items: center;
    justify-content: space-between;
}

.search-wrap {
    position: relative;
    flex: 1;
    min-width: 280px;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.95rem;
    color: var(--text-muted);
    pointer-events: none;
}

.control-input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-title);
    padding: 12px 16px 12px 42px;
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.25s ease;
}

.control-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
    background: rgba(255,255,255,0.01);
}

.filter-sort-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.control-select-wrap {
    position: relative;
}

.control-select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-body);
    padding: 12px 36px 12px 16px;
    border-radius: 12px;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    appearance: none;
    transition: all 0.25s ease;
}

.control-select:hover, .control-select:focus {
    border-color: var(--accent);
    color: var(--text-title);
}

.control-select-wrap::after {
    content: "▼";
    font-size: 0.65rem;
    color: var(--text-muted);
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
}

@media (max-width: 640px) {
    nav { padding: 0 20px; }
    main { padding: 36px 20px 64px; }
    .books-grid { grid-template-columns: 1fr; }
}

/* ── Stats Dashboard ── */
.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.stats-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
}

.stats-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.stats-icon {
    font-size: 1.8rem;
    width: 48px;
    height: 48px;
    background: var(--accent-dim);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stats-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stats-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stats-value {
    font-family: var(--font-ui);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-title);
}

/* ── Crawl Status Floating Panel ── */
.crawl-status-panel {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg-panel);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-hover);
    border-radius: 16px;
    padding: 16px 20px;
    width: 320px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    z-index: 1000;
    display: none;
    flex-direction: column;
    gap: 10px;
    transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
}

.crawl-status-panel.active {
    display: flex;
}

.crawl-status-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-title);
}

.crawl-status-header button {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.2s;
}

.crawl-status-header button:hover {
    color: var(--danger);
}

.crawl-status-progress {
    height: 6px;
    background: rgba(255,255,255,0.05);
    border-radius: 3px;
    overflow: hidden;
}

.crawl-progress-fill {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s ease;
}

.crawl-status-text {
    font-size: 0.78rem;
    color: var(--text-body);
}