:root {
    --bg-color: #0d1117;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --glass-bg: rgba(22, 27, 34, 0.75);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent: #ff4785;
    --accent-hover: #ff2a70;
    --accent-glow: rgba(255, 71, 133, 0.5);
    --success: #2ea043;
    --card-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(255, 71, 133, 0.1), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(88, 166, 255, 0.1), transparent 25%);
    background-attachment: fixed;
    display: flex;
    justify-content: center;
    padding: 2rem;
}

.app-container {
    width: 100%;
    max-width: 1400px;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.glass-header {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 1.5rem 2.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ff4785, #ff9a9e);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.2rem;
}

.header-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.glass-tabs {
    display: flex;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.3rem;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.5rem;
    font-family: inherit;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    background: rgba(255, 71, 133, 0.15);
    color: var(--accent);
    border: 1px solid rgba(255, 71, 133, 0.3);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    min-height: 50vh;
    display: flex;
    flex-direction: column;
}

.btn {
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.primary-btn {
    background: var(--accent);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.primary-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.action-btn {
    background: rgba(255,255,255,0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.action-btn:hover {
    background: rgba(255,255,255,0.1);
}

.action-btn.success {
    background: rgba(46, 160, 67, 0.2);
    border-color: rgba(46, 160, 67, 0.4);
    color: #46c95d;
}

/* Cards Grid Layout */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    width: 100%;
}

@media (min-width: 768px) {
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 1.5rem;
    }
}

.book-card {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--glass-border);
    border-radius: var(--card-radius);
    padding: 0.8rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.5);
    border-color: rgba(255, 255, 255, 0.2);
}

.book-card.processed {
    opacity: 0.6;
    border-color: rgba(46, 160, 67, 0.4);
}

.card-cover-wrapper {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: 8px;
    background: #111;
    position: relative;
}

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

.success-badge {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(46, 160, 67, 0.9);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    z-index: 10;
}

.card-info {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.2rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-author {
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-action {
    width: 100%;
    padding: 0.6rem;
    font-size: 0.9rem;
}

.cover-img {
    object-fit: cover;
    border-radius: 6px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.5);
    background: #111;
}

.cover-img.square {
    width: 70px;
    height: 70px;
}

.cover-img.scraped {
    width: 70px;
    height: 105px;
}

.tags-box {
    background: rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 6px;
    padding: 0.6rem;
    font-size: 0.8rem;
    max-height: 105px;
    overflow-y: auto;
    color: #ffd166;
    line-height: 1.4;
    white-space: pre-wrap;
    transition: var(--transition);
}

.tags-box::-webkit-scrollbar {
    width: 4px;
}

.tags-box::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
}

.action-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    color: var(--text-secondary);
    text-align: center;
    padding: 4rem;
}

.empty-state .empty-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.hidden {
    display: none !important;
}

.status-bar {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 8px;
    background: rgba(88, 166, 255, 0.1);
    border: 1px solid rgba(88, 166, 255, 0.2);
    color: #58a6ff;
    text-align: center;
    font-weight: 600;
    transition: var(--transition);
}
.status-bar.error {
    background: rgba(248, 81, 73, 0.1);
    border-color: rgba(248, 81, 73, 0.2);
    color: #f85149;
}
.status-bar.success {
    background: rgba(46, 160, 67, 0.1);
    border-color: rgba(46, 160, 67, 0.2);
    color: #46c95d;
}

.pulse-glow {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(255, 71, 133, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(255, 71, 133, 0); }
    100% { box-shadow: 0 0 0 0 rgba(255, 71, 133, 0); }
}

.loading-spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

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

.glass-select {
    background: rgba(0,0,0,0.3);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    padding: 0.5rem;
    border-radius: 6px;
    font-family: inherit;
    outline: none;
    cursor: pointer;
    transition: var(--transition);
}
.glass-select:focus {
    border-color: rgba(88, 166, 255, 0.5);
}
.glass-select option {
    background: var(--bg-color);
    color: var(--text-primary);
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    width: 90%;
    max-width: 500px;
    transform: translateY(20px);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    max-height: 90vh;
    overflow-y: auto;
    scrollbar-width: thin;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 1rem;
    margin-bottom: 1.2rem;
}

.modal-header h2 {
    font-size: 1.3rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ff4785, #ff9a9e);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.modal-hero {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: center;
}

.modal-hero .cover-img {
    width: 70px;
    height: 70px;
    flex-shrink: 0;
}

.modal-book-info h3 {
    font-size: 1.1rem;
    margin-bottom: 0.2rem;
}

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

.modal-section {
    margin-bottom: 1.2rem;
}

.modal-section h4 {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-actions-bar {
    display: flex;
    justify-content: center;
    margin-bottom: 1.2rem;
}

.tags-box.highlight {
    border-color: rgba(46, 160, 67, 0.4);
    background: rgba(46, 160, 67, 0.1);
}

.muted {
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.9rem;
}

.muted-text {
    font-size: 0.75rem;
    margin-top: 4px;
    color: var(--text-secondary);
    text-align: right;
}

.modal-footer {
    margin-top: 1rem;
}

/* Match UI Scroll Container */
.matches-scroll-container {
    display: flex;
    overflow-x: auto;
    gap: 1rem;
    padding: 0.5rem 0;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
}
.match-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    min-width: 130px;
    max-width: 130px;
    padding: 0.8rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}
.match-card:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 71, 133, 0.5);
}
.match-card.selected {
    background: rgba(255, 71, 133, 0.15);
    border-color: var(--accent);
    box-shadow: 0 0 15px rgba(255, 71, 133, 0.2);
}
.match-cover {
    width: 90px;
    height: 90px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 0.8rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}
.match-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.3rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.match-author {
    font-size: 0.75rem;
    color: var(--muted-color);
}

/* V3 Modal Tabs */
.modal-tabs {
    display: flex;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.2rem;
    margin-bottom: 1.5rem;
}

.modal-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.6rem 0.5rem;
    font-family: inherit;
    font-weight: 600;
    font-size: 0.8rem;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.modal-tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.modal-tab-btn.active {
    background: rgba(255, 71, 133, 0.15);
    color: var(--accent);
    border: 1px solid rgba(255, 71, 133, 0.3);
}

/* Metadata Comparison Table */
.meta-compare-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

.meta-compare-table th {
    text-align: left;
    color: var(--text-secondary);
    padding: 0.5rem;
    border-bottom: 1px solid var(--glass-border);
    font-size: 0.75rem;
    text-transform: uppercase;
}

.meta-compare-table td {
    padding: 0.6rem 0.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    vertical-align: top;
}

.meta-label {
    width: 100px;
    font-weight: 600;
    color: var(--text-secondary);
}

.meta-current {
    width: 45%;
    color: var(--text-primary);
}

.meta-new {
    width: 45%;
    color: #46c95d;
    font-weight: 500;
}

.meta-new.identical {
    color: var(--text-secondary);
    font-weight: 400;
}

.delete-btn {
    background: rgba(248, 81, 73, 0.1);
    border: 1px solid rgba(248, 81, 73, 0.3);
    color: #f85149;
}

.delete-btn:hover {
    background: rgba(248, 81, 73, 0.2);
    border-color: rgba(248, 81, 73, 0.5);
}

.btn-row {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.btn-row .btn {
    flex: 1;
}

/* Adjusted modal for more content */
.modal-content {
    max-width: 700px;
}

@media (max-width: 768px) {
    .modal-hero {
        flex-direction: column;
        text-align: center;
    }
    .meta-compare-table th:nth-child(2), 
    .meta-compare-table td:nth-child(2) {
        display: none; /* Hide 'current' on very small screens to save space */
    }
}