.theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle-btn:hover {
    background: var(--color-accent-soft);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.theme-toggle-btn .theme-icon-dark,
.theme-toggle-btn .theme-icon-light {
    font-size: 1rem;
    line-height: 1;
}

[data-theme="light"] .theme-toggle-btn .theme-icon-dark {
    display: inline-block;
}

[data-theme="light"] .theme-toggle-btn .theme-icon-light {
    display: none;
}

[data-theme="dark"] .theme-toggle-btn .theme-icon-dark {
    display: none;
}

[data-theme="dark"] .theme-toggle-btn .theme-icon-light {
    display: inline-block;
}

[data-theme="dark"] .theme-toggle-btn {
    background: var(--color-surface-raised);
    border-color: var(--color-border);
    color: var(--color-text-secondary);
}

.topbar-avatar-container .theme-toggle-btn {
    margin-right: var(--space-2);
}