/* --------------------------------------------------------------------------
   Theme toggle + login link
   The .login-link mirrors .theme-toggle's chrome exactly so the two chrome
   actions read as a coherent set in the nav-right cluster. Shared rules
   are grouped; only the icon-specific bits diverge.
-------------------------------------------------------------------------- */
.theme-toggle,
.login-link {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--surface-border);
    border-radius: var(--r-card);
    width: 36px;
    height: 36px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    overflow: hidden;
    text-decoration: none;
    transition:
        color        var(--transition),
        border-color var(--transition),
        background   var(--transition);
}
.theme-toggle:hover,
.login-link:hover,
.login-link:focus-visible {
    background: var(--surface-hover);
    border-color: var(--color-accent);
    color: var(--color-accent);
    outline: none;
}
.theme-toggle .toggle-icon {
    width: 18px;
    height: 18px;
    position: absolute;
    inset: 0;
    margin: auto;
    transition: opacity var(--transition), transform var(--transition);
}
.theme-toggle .toggle-icon.sun  { opacity: 0; transform: rotate(-90deg) scale(0.6); }
.theme-toggle .toggle-icon.moon { opacity: 1; transform: rotate(0)      scale(1); }
:root[data-theme="light"] .theme-toggle .toggle-icon.sun  { opacity: 1; transform: rotate(0)     scale(1); }
:root[data-theme="light"] .theme-toggle .toggle-icon.moon { opacity: 0; transform: rotate(90deg) scale(0.6); }

/* Login-link icon — static, no theme-driven swap. Same 18px slot as the
   toggle icons so the two actions feel visually balanced. Small
   translate-X on hover is a subtle "enter" nudge; respects reduced motion. */
.login-link svg {
    width: 18px;
    height: 18px;
    display: block;
    transition: transform var(--transition);
}
.login-link:hover svg,
.login-link:focus-visible svg { transform: translateX(1px); }
@media (prefers-reduced-motion: reduce) {
    .login-link:hover svg,
    .login-link:focus-visible svg { transform: none; }
}