.btn-primary,
.btn-secondary,
.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border-radius: var(--radius);
    font-family: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        opacity 0.15s ease,
        transform 0.15s ease;
}

.btn-primary {
    padding: 0.55rem 1.2rem;
    border: none;
    background: var(--accent-color);
    color: var(--text-on-accent);
    font-size: var(--font-size-sm);
}

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

.btn-secondary,
.btn-ghost {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.btn-secondary:hover,
.btn-ghost:hover {
    background: var(--surface-hover);
}

.btn-ghost--sm {
    padding: 0.35rem 0.75rem;
    font-size: var(--font-size-xs);
}

.btn-play,
.btn-action-icon,
.btn-header-action,
.btn-file-menu,
.btn-probe,
.btn-modal-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    font-family: inherit;
    cursor: pointer;
}

.btn-play {
    gap: 0.45rem;
    padding: 0.55rem 1.4rem;
    border-radius: 999px;
    background: var(--success-color);
    color: var(--text-on-accent);
    font-size: var(--font-size-sm);
    font-weight: 700;
    transition:
        background 0.15s ease,
        transform 0.15s ease;
}

.btn-play:hover {
    background: var(--success-color);
    transform: translateY(-1px);
}

.btn-action-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius);
    border: 1px solid var(--border-strong);
    background: transparent;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: background 0.15s ease;
}

.btn-action-icon:hover {
    background: var(--surface-hover);
}

.btn-action-danger {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.btn-action-danger:hover {
    background: var(--danger-subtle);
}

.btn-header-action {
    gap: 0.35rem;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-strong);
    background: transparent;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.12s ease;
}

.btn-header-action:hover {
    background: var(--surface-hover);
}

.btn-header-action.active {
    background: var(--accent-subtle);
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.btn-file-menu {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition:
        background 0.12s ease,
        color 0.12s ease;
}

.btn-file-menu:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.btn-probe {
    gap: 0.4rem;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: background 0.12s ease;
}

.btn-probe:hover {
    background: var(--surface-hover);
}

.btn-modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius);
    background: var(--surface-hover);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    transition: background 0.12s ease;
}

.btn-modal-close:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}