/* Light/dark toggle button. The page's own <style> holds the light colors (html.light ...). */
.theme-toggle {
    -webkit-appearance: none;
    appearance: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    padding: 0;
    margin: 0;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(255,255,255,0.05);
    color: #cbd5e1;
    cursor: pointer;
    pointer-events: auto;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.theme-toggle:hover { background: rgba(255,255,255,0.10); color: #fff; }
.theme-toggle:focus-visible { outline: 2px solid #f97316; outline-offset: 2px; }
.theme-toggle svg { width: 16px; height: 16px; display: block; }
.theme-toggle .icon-moon { display: none; }

html.light .theme-toggle {
    border-color: rgba(15,23,42,0.14);
    background: #fff;
    color: #334155;
}
html.light .theme-toggle:hover { background: #f1f5f9; color: #0f172a; }
html.light .theme-toggle .icon-sun { display: none; }
html.light .theme-toggle .icon-moon { display: block; }