.tb-step-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--tb-text-sm);
    font-weight: 500;
    color: var(--tb-text-muted);
    margin-bottom: 14px;
}

.tb-step-num {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--tb-primary);
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tb-type-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.tb-type-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 10px;
    background: var(--tb-surface-2);
    border: 1.5px solid var(--tb-border);
    border-radius: var(--tb-radius);
    cursor: pointer;
    transition: border-color var(--tb-transition), background var(--tb-transition);
    text-align: center;
    font-family: var(--tb-font-sans);
}

.tb-type-card:hover {
    border-color: var(--tb-border-hover);
    background: var(--tb-surface-3);
}

.tb-type-card.active {
    border-color: var(--tb-primary);
    background: var(--tb-primary-dim);
}

.tb-type-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--tb-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.tb-type-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--tb-text);
}

.tb-type-ext {
    font-size: 10px;
    color: var(--tb-text-faint);
    line-height: 1.4;
}

.tb-file-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 60px 24px;
    text-align: center;
    line-height: 1.5;
}

.tb-file-placeholder i {
    font-size: 48px;
    color: var(--tb-text-faint);
}

.tb-file-placeholder-name {
    font-size: var(--tb-text-base);
    font-weight: 500;
    color: var(--tb-text);
    word-break: break-all;
}

.tb-file-placeholder-meta {
    font-size: var(--tb-text-sm);
    color: var(--tb-text-muted);
    font-family: var(--tb-font-mono);
}

.tb-notice {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 14px;
    background: var(--tb-primary-dim);
    border: 1px solid var(--tb-primary-border);
    border-radius: var(--tb-radius);
    font-size: var(--tb-text-sm);
    color: var(--tb-text-muted);
    line-height: 1.55;
}

.tb-notice i {
    color: var(--tb-primary);
    flex-shrink: 0;
    margin-top: 1px;
}

.tb-check {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: var(--tb-text-sm);
    color: var(--tb-text-muted);
    cursor: pointer;
    line-height: 1.5;
}

.tb-check input[type="checkbox"] {
    accent-color: var(--tb-primary);
    width: 15px;
    height: 15px;
    margin-top: 2px;
    flex-shrink: 0;
    cursor: pointer;
}

.tb-meta {
    grid-template-columns: 1fr 1fr;
}

/* Loader */
.tb-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: tb-spin .7s linear infinite;
    vertical-align: -3px;
}

.tb-spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

.tb-stage-busy {
    line-height: 1.5;
}

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

@media (max-width: 575px) {
    .tb-type-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}