.tool-container {
    --kinsert-primary: #0ea5e9;
    --kinsert-primary-hover: #0284c7;
    --kinsert-text: #e2e8f0;
    --kinsert-muted: #94a3b8;
    --kinsert-border: #334155;
    --kinsert-surface: #0f172a;
    --kinsert-surface-alt: #111827;
    --kinsert-blank: #64748b;
    --kinsert-shadow: 0 10px 24px rgba(2, 6, 23, 0.3);
    --kinsert-hover: rgba(14, 165, 233, 0.14);
    --kinsert-tooltip: #0b1220;
    --primary: var(--kinsert-primary);
    --primary-hover: var(--kinsert-primary-hover);
    --text-main: var(--kinsert-text);
    --text-muted: var(--kinsert-muted);
    --border: var(--kinsert-border);
    --blank-accent: var(--kinsert-blank);
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px 110px;
}

body.light-mode .tool-container {
    --kinsert-text: #1e293b;
    --kinsert-muted: #64748b;
    --kinsert-border: #dbe3ef;
    --kinsert-surface: #ffffff;
    --kinsert-surface-alt: #f8fafc;
    --kinsert-blank: #94a3b8;
    --kinsert-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
    --kinsert-hover: rgba(14, 165, 233, 0.08);
    --kinsert-tooltip: #1e293b;
}

.tool-header-custom {
    text-align: center;
    margin-bottom: 30px;
}

.tool-header-custom h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 10px;
    color: var(--kinsert-text);
}

.tool-header-custom p {
    color: var(--kinsert-muted);
}

.upload-zone {
    border: 2px dashed var(--kinsert-border);
    border-radius: 16px;
    background: var(--kinsert-surface);
    color: var(--kinsert-text);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
    box-shadow: var(--kinsert-shadow);
}

.upload-zone:hover,
.upload-zone.is-dragging {
    border-color: var(--kinsert-primary);
    background: var(--kinsert-hover);
    transform: translateY(-1px);
}

.upload-zone h3 {
    color: var(--kinsert-text);
}

.pages-flow {
    display: none;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 40px;
    align-items: center;
}

.page-wrapper {
    display: flex;
    align-items: center;
    gap: 15px;
    position: relative;
}

.page-card {
    width: 140px;
    aspect-ratio: 1 / 1.4;
    background: var(--kinsert-surface);
    border-radius: 8px;
    border: 1px solid var(--kinsert-border);
    box-shadow: var(--kinsert-shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-card:hover {
    transform: translateY(-3px);
    border-color: #4b5f82;
}

.page-num {
    position: absolute;
    bottom: 8px;
    font-size: 0.75rem;
    color: var(--kinsert-muted);
}

.page-preview-icon {
    font-size: 2rem;
    color: var(--kinsert-blank);
}

.page-preview-canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.blank-card {
    width: 140px;
    aspect-ratio: 1 / 1.4;
    background: var(--kinsert-surface-alt);
    border: 2px dashed var(--kinsert-blank);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    color: var(--kinsert-text);
    animation: popIn 0.25s ease;
}

@keyframes popIn {
    from {
        transform: scale(0.92);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.blank-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--kinsert-blank);
    margin-top: 5px;
    text-transform: uppercase;
}

.delete-blank-btn {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 24px;
    height: 24px;
    background: #ef4444;
    color: #fff;
    border-radius: 50%;
    border: 2px solid var(--kinsert-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.8rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.16);
    transition: transform 0.2s ease;
}

.delete-blank-btn:hover {
    transform: scale(1.08);
}

.insert-btn {
    width: 32px;
    height: 32px;
    background: var(--kinsert-surface-alt);
    border: 1px solid var(--kinsert-border);
    border-radius: 50%;
    color: var(--kinsert-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    box-shadow: 0 2px 5px rgba(15, 23, 42, 0.14);
}

.insert-btn:hover {
    background: var(--kinsert-primary);
    color: #fff;
    border-color: var(--kinsert-primary);
    transform: scale(1.08);
}

.insert-btn::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--kinsert-tooltip);
    color: #fff;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.7rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    margin-bottom: 5px;
}

.insert-btn:hover::after {
    opacity: 1;
}

.action-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: var(--kinsert-surface);
    padding: 15px 40px;
    border-top: 1px solid var(--kinsert-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transform: translateY(100%);
    transition: transform 0.3s ease;
    box-shadow: 0 -10px 24px rgba(2, 6, 23, 0.35);
    z-index: 100;
}

.action-bar.visible {
    transform: translateY(0);
}

.download-btn {
    background: var(--kinsert-primary);
    color: #fff;
    padding: 12px 30px;
    border-radius: 10px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
    transition: background-color 0.2s ease;
}

.download-btn:hover {
    background: var(--kinsert-primary-hover);
}

.download-btn:disabled,
.download-btn.processing {
    background: var(--kinsert-muted);
    cursor: not-allowed;
    box-shadow: none;
}

@media (max-width: 780px) {
    .action-bar {
        padding: 12px 16px;
        gap: 12px;
        flex-direction: column;
        align-items: flex-start;
    }

    .download-btn {
        width: 100%;
    }
}