/* ── Mode tabs ── */
.mode-tabs {
    display: flex;
    gap: .35rem;
    flex-wrap: wrap;
    margin-bottom: 1.1rem
}

.mode-tab {
    padding: .45rem .95rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid var(--border2);
    background: var(--bg3);
    color: var(--text2);
    font-size: .85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all .15s;
    white-space: nowrap
}

.mode-tab.active {
    background: var(--accent-bg);
    border-color: var(--accent);
    color: var(--accent)
}

/* ── Thumb grid ── */
.split-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: .75rem;
    margin: 1rem 0
}

@media(max-width:480px) {
    .split-grid {
        grid-template-columns: repeat(auto-fill, minmax(85px, 1fr));
        gap: .5rem
    }
}

.split-thumb {
    border: 2.5px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: all .18s;
    background: var(--surface);
    position: relative;
    user-select: none;
}

.split-thumb:hover {
    border-color: var(--accent2);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md)
}

.split-thumb.selected {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-bg)
}

.split-thumb.group-a {
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px #dbeafe
}

.split-thumb.group-b {
    border-color: #10b981;
    box-shadow: 0 0 0 2px #d1fae5
}

.split-thumb canvas {
    display: block;
    width: 100%;
    height: auto
}

.thumb-footer {
    padding: 4px 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface2);
    border-top: 1px solid var(--border);
}

.thumb-pg {
    font-size: 11px;
    color: var(--text3);
    font-weight: 500
}

.thumb-check {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    border: 1.5px solid var(--border2);
    background: var(--bg3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    transition: all .12s;
    flex-shrink: 0;
}

.split-thumb.selected .thumb-check {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff
}

/* Split point markers */
.split-marker {
    position: absolute;
    top: 0;
    right: -13px;
    width: 24px;
    height: 24px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    color: #fff;
    z-index: 2;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

/* ── Selection bar ── */
.sel-bar {
    display: flex;
    align-items: center;
    gap: .5rem;
    flex-wrap: wrap;
    padding: .55rem .75rem;
    background: var(--accent-bg);
    border: 1px solid var(--accent-border);
    border-radius: var(--radius-sm);
    margin-bottom: .75rem;
    font-size: .83rem;
    color: var(--accent);
    font-weight: 500;
}

.sel-bar .sel-actions {
    display: flex;
    gap: .4rem;
    margin-left: auto;
    flex-wrap: wrap
}

.sel-bar button {
    font-size: .78rem;
    padding: .25rem .6rem;
    height: auto
}

/* ── Split preview list ── */
.split-parts {
    display: flex;
    flex-direction: column;
    gap: .5rem;
    margin: .75rem 0
}

.split-part {
    display: flex;
    align-items: center;
    gap: .65rem;
    padding: .55rem .75rem;
    background: var(--bg3);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .83rem;
}

.part-icon {
    font-size: 18px;
    flex-shrink: 0
}

.part-info {
    flex: 1
}

.part-label {
    font-weight: 600;
    color: var(--text)
}

.part-pages {
    font-size: .78rem;
    color: var(--text3);
    margin-top: 1px
}

.part-del {
    cursor: pointer;
    color: var(--text3);
    padding: 3px 6px;
    border-radius: 4px;
    border: none;
    background: transparent;
    font-size: 14px
}

.part-del:hover {
    background: var(--error-bg);
    color: var(--error)
}

/* ── Range input help ── */
.range-help {
    font-size: .78rem;
    color: var(--text3);
    margin-top: .35rem
}

/* ── Loading overlay ── */
.thumb-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    color: var(--text3);
    font-size: .83rem;
    gap: .5rem;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin .7s linear infinite;
    flex-shrink: 0
}

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

.result-zone {
    display: none
}

.result-zone.show {
    display: flex
}