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

:root {
    --primary: #4f46e5;
    --primary-light: #6366f1;
    --primary-dark: #4338ca;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Background image */
body.has-bg {
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}
body.has-bg::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(240,242,245,0.92);
    z-index: -1;
}

/* ===== Header ===== */
#app-header {
    background: var(--card-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-top {
    padding: 0;
}

.header-divider {
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    width: 80px;
    margin: 0;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 24px;
}

.logo-area {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border);
    cursor: pointer;
    transition: border-color 0.2s;
}

.app-title-area {
    display: flex;
    align-items: center;
    gap: 8px;
}

.app-version {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 500;
}
.logo-area:hover { border-color: var(--primary); }
.logo-placeholder {
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
}
.logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.app-title-area {
    flex: 1;
}
.app-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    cursor: pointer;
}

.header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}
.header-btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}
.header-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.header-btn-back, .header-btn-forward {
    padding: 8px 12px;
    font-size: 13px;
}
.header-btn-save {
    background: var(--success);
    color: white;
    border-color: var(--success);
}
.header-btn-save:hover {
    background: #0d9668;
    border-color: #0d9668;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: 8px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
    cursor: pointer;
}
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .separator { color: var(--border); }

/* ===== Main Content ===== */
#main-content {
    flex: 1;
    padding: 24px;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

/* ===== Home Page Category Grid ===== */
.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.category-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}
.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.category-card-image {
    width: 100%;
    height: 140px;
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.category-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.category-card-image .placeholder {
    font-size: 36px;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
}

.category-card-info {
    padding: 12px 16px;
}
.category-card-name {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}
.category-card-count {
    font-size: 13px;
    color: var(--text-secondary);
}

.category-card-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}
.category-card:hover .category-card-actions {
    opacity: 1;
}
.category-card-actions button {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.9);
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.category-card-actions button:hover { background: white; }

/* Add Card */
.add-card {
    background: transparent;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
    min-height: 200px;
}
.add-card:hover {
    border-color: var(--primary);
    background: rgba(79,70,229,0.04);
}
.add-card-content {
    text-align: center;
    color: var(--text-secondary);
}
.add-card-content .plus {
    font-size: 36px;
    color: var(--primary);
    margin-bottom: 8px;
}
.add-card-content .text {
    font-size: 14px;
}

/* ===== Sub-category Grid (Level 2) ===== */
.subcategory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.subcategory-card {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}
.subcategory-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.subcategory-card-image {
    width: 100%;
    height: 120px;
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.subcategory-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.subcategory-card-image .placeholder {
    font-size: 28px;
    color: var(--primary);
    font-weight: 700;
}

.subcategory-card-info {
    padding: 10px 12px;
}
.subcategory-card-name {
    font-size: 15px;
    font-weight: 600;
}
.subcategory-card-count {
    font-size: 12px;
    color: var(--text-secondary);
}

.subcategory-card-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}
.subcategory-card:hover .subcategory-card-actions { opacity: 1; }
.subcategory-card-actions button {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.9);
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Folder Grid (Level 3 for model type) ===== */
.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.folder-card {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}
.folder-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.folder-card-icon {
    width: 100%;
    height: 100px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.folder-card-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.folder-card-icon .placeholder {
    font-size: 40px;
}

.folder-card-info {
    padding: 8px 12px;
}
.folder-card-name {
    font-size: 14px;
    font-weight: 600;
}
.folder-card-count {
    font-size: 12px;
    color: var(--text-secondary);
}

.folder-card-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}
.folder-card:hover .folder-card-actions { opacity: 1; }
.folder-card-actions button {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.9);
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Item Grid (Final Level) ===== */
.item-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.item-card {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    position: relative;
}
.item-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.item-card-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #e0e7ff, #c7d2fe);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}
.item-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.item-card-image .placeholder {
    font-size: 24px;
    color: var(--primary);
}

.purchased-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--success);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}
.not-purchased-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--text-secondary);
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
}

.item-card-info {
    padding: 10px 12px;
}
.item-card-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.item-card-meta {
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.item-card-meta span {
    background: var(--bg);
    padding: 2px 6px;
    border-radius: 4px;
}

.item-card-actions {
    position: absolute;
    top: 6px;
    right: 6px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
}
.item-card:hover .item-card-actions { opacity: 1; }
.item-card-actions button {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.9);
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Multi-Select ===== */
.multi-select-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}
.multi-select-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    padding: 10px 16px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    flex-wrap: wrap;
}
.multi-select-check {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}
.multi-select-check input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary);
}
.multi-select-count {
    font-size: 14px;
    color: var(--primary);
    font-weight: 600;
    margin-left: auto;
}
.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.item-checkbox {
    position: absolute;
    top: 8px;
    left: 8px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    border: 2px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    z-index: 10;
    transition: all 0.2s;
}
.item-checkbox.checked {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.item-card-selected {
    outline: 3px solid var(--primary);
    outline-offset: -3px;
}

/* ===== Floating Add Button ===== */
.floating-add-btn {
    position: fixed;
    bottom: 80px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-size: 14px;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(79,70,229,0.4);
    z-index: 50;
    transition: transform 0.2s, background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    white-space: nowrap;
    overflow: hidden;
    width: auto;
    padding: 0 20px;
    border-radius: 28px;
    height: 48px;
}
.floating-add-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

/* ===== Import/Export Bar ===== */
.io-bar {
    position: fixed;
    bottom: 24px;
    left: 24px;
    display: flex;
    gap: 8px;
    z-index: 50;
}
.io-btn {
    padding: 8px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
}
.io-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.modal-header h2 {
    font-size: 18px;
    font-weight: 700;
}
.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
    padding: 0;
}
.modal-close:hover { color: var(--text); }

.modal-body {
    padding: 24px;
}

.form-group {
    margin-bottom: 16px;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
}
.form-group label .required {
    color: var(--danger);
    margin-left: 2px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-row {
    display: flex;
    gap: 12px;
}
.form-row .form-group {
    flex: 1;
}

.image-upload-area {
    width: 120px;
    height: 120px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    background: var(--bg);
}
.image-upload-area:hover { border-color: var(--primary); }
.image-upload-area img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.image-upload-area .upload-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 12px;
}
.image-upload-area .upload-text .icon {
    font-size: 24px;
    display: block;
    margin-bottom: 4px;
}
.image-delete-overlay {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(239,68,68,0.85);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background 0.2s;
}
.image-delete-overlay:hover {
    background: var(--danger);
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}
.btn {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn:hover { background: var(--bg); }
.btn-primary {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}
.btn-danger:hover { background: #dc2626; }

/* ===== Detail Popup ===== */
.detail-popup-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.7);
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.detail-popup-content {
    background: var(--card-bg);
    border-radius: var(--radius);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.detail-popup-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0,0,0,0.5);
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}
.detail-popup-close:hover { background: rgba(0,0,0,0.8); }

.detail-image-section {
    width: 100%;
    height: 400px;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.detail-image-section img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}
.detail-image-section .placeholder {
    font-size: 48px;
    color: var(--text-secondary);
}

.detail-info-section {
    padding: 24px;
}

.detail-info-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.detail-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}
.detail-info-item {
    background: var(--bg);
    padding: 12px;
    border-radius: var(--radius-sm);
}
.detail-info-item .label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.detail-info-item .value {
    font-size: 15px;
    font-weight: 600;
}

.detail-purchase-section {
    margin-top: 20px;
    border-top: 1px solid var(--border);
    padding-top: 20px;
}
.detail-purchase-section h3 {
    font-size: 16px;
    margin-bottom: 12px;
}
.purchase-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.purchase-item {
    display: flex;
    gap: 12px;
    align-items: center;
    background: var(--bg);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}
.purchase-item .purchase-info {
    flex: 1;
    font-size: 14px;
}
.purchase-item .purchase-delete {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 16px;
}

.detail-gallery {
    margin-top: 20px;
    border-top: 1px solid var(--border);
    padding-top: 20px;
}
.detail-gallery h3 {
    font-size: 16px;
    margin-bottom: 12px;
}
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}
.gallery-item {
    width: 100%;
    height: 150px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}
.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
}
.gallery-item .delete-btn {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(0,0,0,0.6);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.gallery-add {
    width: 100%;
    height: 150px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 24px;
    transition: border-color 0.2s;
}
.gallery-add:hover { border-color: var(--primary); color: var(--primary); }

/* ===== Statistics Page ===== */
.page-stats-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}
.stat-pill {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 6px 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    box-shadow: var(--shadow);
}

/* ===== Statistics Page ===== */
.stats-page {
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.stats-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.stats-section-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
    color: var(--text);
}
.stats-summary {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}
.stat-card {
    background: linear-gradient(135deg, var(--bg), var(--card-bg));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.stat-card .stat-value {
    font-size: 26px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.3;
    word-break: break-all;
}
.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 6px;
}

/* Table styles */
.stats-table-wrap {
    overflow-x: auto;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}
.stats-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.stats-table th {
    background: var(--primary);
    color: white;
    padding: 10px 12px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
    position: sticky;
    top: 0;
}
.stats-table td {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
}
.stats-table tbody tr:hover td {
    background: var(--bg);
}
.stats-table .num {
    text-align: right;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}
.stats-table .total-row {
    font-weight: 700;
    background: var(--bg);
}
.stats-table .total-row td {
    border-top: 2px solid var(--primary);
}
.stats-table .undated-row td {
    color: var(--text-secondary);
    font-style: italic;
}
.matrix-table th {
    white-space: nowrap;
    font-size: 12px;
}

/* Chart styles */
.chart-container {
    width: 100%;
    overflow-x: auto;
}
.chart-empty {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 14px;
}
.bar-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    gap: 8px;
    padding: 20px 10px 0;
    border-bottom: 2px solid var(--border);
    min-height: 200px;
}
.bar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    min-width: 50px;
    max-width: 120px;
    height: 100%;
    justify-content: flex-end;
}
.bar-fill {
    width: 70%;
    max-width: 60px;
    min-height: 2px;
    border-radius: 6px 6px 0 0;
    transition: height 0.4s ease, opacity 0.2s;
    cursor: pointer;
    position: relative;
}
.bar-fill:hover {
    opacity: 0.8;
}
.bar-value {
    font-size: 11px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    white-space: nowrap;
}
.bar-label {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 6px;
    text-align: center;
    word-break: break-all;
    line-height: 1.2;
    max-width: 100px;
}

/* ===== Image Picker Overlay ===== */
.image-picker-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: toastFadeIn 0.2s;
}
.image-picker-dialog {
    background: var(--card-bg, #fff);
    border-radius: 16px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    width: 360px;
    max-width: 90vw;
    overflow: hidden;
}
.image-picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border, #e0e0e0);
    font-size: 18px;
    font-weight: 700;
}
.image-picker-close {
    background: none;
    border: none;
    font-size: 22px;
    cursor: pointer;
    color: var(--text-secondary, #999);
    padding: 0 4px;
    line-height: 1;
}
.image-picker-close:hover { color: var(--danger, #e53935); }
.image-picker-body {
    padding: 24px 20px;
    text-align: center;
}
.image-picker-btn {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 40px;
    background: var(--primary, #4a90d9);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s;
}
.image-picker-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.picker-icon { font-size: 28px; }
.image-picker-divider {
    height: 1px;
    background: var(--border, #e0e0e0);
    margin: 20px 0;
}
.image-picker-hint {
    color: var(--text-secondary, #888);
    font-size: 13px;
    line-height: 1.8;
}
.image-picker-hint strong { color: var(--text, #333); }
.image-picker-hint kbd {
    display: inline-block;
    padding: 2px 8px;
    background: var(--bg, #f5f5f5);
    border: 1px solid var(--border, #ccc);
    border-radius: 4px;
    font-size: 12px;
    font-family: monospace;
}

/* ===== Inline Stats Toggle ===== */
.stats-toggle-wrap {
    margin-top: 24px;
}
.stats-toggle-btn {
    width: 100%;
    padding: 12px 20px;
    font-size: 15px;
    font-weight: 600;
    color: var(--primary);
    background: var(--card-bg);
    border: 2px dashed var(--primary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
}
.stats-toggle-btn:hover {
    background: var(--bg);
}
.stats-toggle-panel {
    margin-top: 16px;
}
.inline-stats-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}
.inline-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

/* ===== Daily Analysis ===== */
.daily-analysis {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 16px;
}
.daily-analysis-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text);
}
.daily-analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
}
.daily-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 14px 12px;
    text-align: center;
    border: 1px solid var(--border);
    transition: transform 0.2s;
}
.daily-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.daily-label {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
}
.daily-value {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}
.daily-value.active {
    color: var(--primary);
}

/* ===== Settings Page ===== */
.settings-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}
.settings-section h2 {
    font-size: 18px;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.settings-row {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}
.settings-row label {
    width: 140px;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}
.settings-row .input-area {
    flex: 1;
}
.settings-row .input-area input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
}
.settings-note {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ===== Toast ===== */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    z-index: 500;
    animation: toastFadeIn 0.3s;
}
@keyframes toastFadeIn {
    from { opacity: 0; transform: translateX(-50%) translateY(10px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}
.empty-state .icon {
    font-size: 48px;
    margin-bottom: 12px;
}
.empty-state .text {
    font-size: 16px;
}

/* ===== List View (alternative to grid for 2-level types) ===== */
.list-view {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.list-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 16px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 16px;
    cursor: pointer;
    transition: box-shadow 0.2s;
    position: relative;
}
.list-item:hover { box-shadow: var(--shadow-lg); }

.list-item-image {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
}
.list-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.list-item-image .placeholder { font-size: 24px; color: var(--primary); }

.list-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.list-item-name {
    font-size: 16px;
    font-weight: 600;
}
.list-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
}
.list-item-meta span {
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 4px;
}

.list-item-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}
.list-item-actions button {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}
.list-item-actions button:hover { background: var(--bg); }
.list-item-actions .btn-edit:hover { background: var(--primary); color: white; border-color: var(--primary); }
.list-item-actions .btn-delete:hover { background: var(--danger); color: white; border-color: var(--danger); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-content { flex-wrap: wrap; padding: 8px 12px; gap: 8px; }
    .header-actions { flex-wrap: wrap; gap: 4px; }
    .header-btn { padding: 6px 10px; font-size: 12px; }
    .header-btn-back, .header-btn-forward { display: none; }
    .category-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
    .form-row { flex-direction: column; }
    .detail-popup-content { max-width: 100%; max-height: 100vh; overflow-y: auto; }
    .detail-image-section { height: 200px; }
    .io-bar { flex-wrap: wrap; gap: 6px; padding: 8px 12px; }
    .io-btn { font-size: 12px; padding: 6px 12px; }
    .settings-row { flex-direction: column; align-items: flex-start; }
    .settings-row label { width: auto; }
    .logo-area { width: 40px; height: 40px; }
    .app-title { font-size: 16px; }
    .app-version { font-size: 10px; }
    .breadcrumb { padding: 6px 12px; font-size: 11px; }
    #main-content { padding: 12px; }
    .page-title { font-size: 18px; margin-bottom: 12px; }
    .filter-bar { flex-direction: column; align-items: stretch; gap: 6px; }
    .filter-search { min-width: auto; }
    .filter-sort { min-width: auto; }
    .filter-btn { padding: 4px 10px; font-size: 12px; }
    .filter-series { max-width: none; }
    .modal-content { max-width: 100% !important; max-height: 90vh; overflow-y: auto; margin: 10px; }
    .subcategory-grid, .folder-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
    .item-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
    .item-card-image { height: 120px; }
    .item-card-info { padding: 8px 10px; }
    .item-card-name { font-size: 13px; }
    .item-card-meta { font-size: 11px; }
    .floating-add-btn { bottom: 16px; right: 16px; font-size: 13px; padding: 10px 16px; }
}

@media (max-width: 480px) {
    .header-content { padding: 6px 8px; }
    .header-actions { width: 100%; justify-content: center; }
    .header-btn { padding: 5px 8px; font-size: 11px; }
    .logo-area { width: 32px; height: 32px; }
    .app-title { font-size: 14px; }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .subcategory-grid, .folder-grid { grid-template-columns: repeat(2, 1fr); }
    .item-grid { grid-template-columns: repeat(2, 1fr); }
    .item-card-image { height: 100px; }
    .item-card-info { padding: 6px 8px; }
    .item-card-name { font-size: 12px; }
    .category-card-image { height: 100px; }
    .io-bar { padding: 6px 8px; }
    .io-btn { font-size: 11px; padding: 5px 8px; }
    #main-content { padding: 8px; }
    .breadcrumb { padding: 4px 8px; font-size: 10px; gap: 4px; }
    .filter-btn-group { flex-wrap: wrap; }
}

/* Safe area for iOS notched devices */
@supports (padding: env(safe-area-inset-top)) {
    .header-content { padding-top: max(12px, env(safe-area-inset-top)); }
    .floating-add-btn { bottom: max(16px, env(safe-area-inset-bottom)); }
}

/* Touch-friendly: disable hover-only effects on mobile */
@media (hover: none) {
    .category-card-actions { opacity: 1; }
    .category-card:hover { transform: none; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #c1c1c1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #a1a1a1; }

/* ===== Filter Bar ===== */
.filter-bar { display: flex; gap: 12px; margin-bottom: 16px; align-items: center; flex-wrap: wrap; }
.filter-search { flex: 1; min-width: 200px; padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--card-bg); color: var(--text); }
.filter-search:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.filter-sort { padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--card-bg); color: var(--text); cursor: pointer; min-width: 160px; }
.filter-sort:focus { outline: none; border-color: var(--primary); }

/* ===== Multi-select for category/subcategory/folder cards ===== */
.subcategory-card-selected,
.folder-card-selected,
.category-card.item-card-selected {
    outline: 3px solid var(--primary);
    outline-offset: -3px;
}

/* ===== Drag & Drop visual feedback ===== */
.category-card {
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
}

.category-card.drag-over {
    border-top: 3px solid var(--primary);
}

/* ===== Detail popup textarea field display ===== */
.detail-info-item .value {
    word-break: break-word;
    white-space: pre-wrap;
}


/* ===== Filter Button Group (V1.8.6) ===== */
.filter-btn-group {
    display: flex;
    gap: 4px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    padding: 2px;
    border: 1px solid var(--border);
}
.filter-btn {
    padding: 6px 14px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.2s;
}
.filter-btn:hover {
    background: var(--bg);
    color: var(--text);
}
.filter-btn.active {
    background: var(--primary);
    color: white;
}
.filter-series {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    background: var(--card-bg);
    color: var(--text);
    cursor: pointer;
    max-width: 150px;
}

/* ===== Series Tags Input ===== */
.series-tag-chip {
    display: inline-flex !important;
    align-items: center;
    gap: 4px;
    background: var(--bg);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 13px;
    margin: 2px;
    border: 1px solid var(--border);
}
.series-tag-chip button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--danger);
    font-size: 14px;
    padding: 0;
    line-height: 1;
}

/* ===== Header Save Buttons ===== */
.header-btn-save {
    background: var(--success);
    color: white;
}
.header-btn-save:hover {
    opacity: 0.9;
}

/* ===== Card Series Tags (V1.8.7) ===== */
.card-series-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 2px 0;
}
.card-series-tag {
    display: inline-block;
    background: var(--bg);
    color: var(--text);
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 11px;
    line-height: 1.4;
    border: 1px solid var(--border);
}

/* ===== Global Search ===== */
.search-result-item {
    transition: all 0.2s;
}
.search-result-item:hover {
    transform: translateX(2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}