.app-interface-help-highlight {
    position: fixed;
    z-index: 1900;
    border: 2px solid #ffd43b;
    border-radius: 0.375rem;
    box-shadow: 0 0 0 0.25rem rgba(255, 212, 59, 0.28), 0 0.5rem 1.25rem rgba(0, 0, 0, 0.28);
    pointer-events: none;
    transition: left 0.15s ease, top 0.15s ease, width 0.15s ease, height 0.15s ease;
}

.app-interface-help-hint {
    position: fixed;
    z-index: 1901;
    width: min(20rem, calc(100vw - 1.5rem));
    border: 1px solid #495057;
    border-radius: 0.375rem;
    background: #212529;
    box-shadow: 0 0.75rem 1.75rem rgba(0, 0, 0, 0.32);
    color: #f8f9fa;
    padding: 0.75rem;
    user-select: text;
}

.app-interface-help-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
}

.app-interface-help-title {
    font-size: 0.875rem;
    line-height: 1.35;
}

.app-interface-help-close {
    flex: 0 0 auto;
    width: 1.5rem;
    height: 1.5rem;
    border: 0;
    border-radius: 0.25rem;
    background: transparent;
    color: #ced4da;
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1;
}

.app-interface-help-close:hover,
.app-interface-help-close:focus-visible {
    background: #495057;
    color: #ffffff;
    outline: none;
}

.app-interface-help-message {
    margin: 0.375rem 0 0;
    color: #dee2e6;
    font-size: 0.8125rem;
    line-height: 1.45;
}

.app-interface-help-highlight[hidden],
.app-interface-help-hint[hidden] {
    display: none;
}

@media (prefers-reduced-motion: reduce) {
    .app-interface-help-highlight {
        transition: none;
    }
}