:root[data-theme="dark"] {
    color-scheme: dark;
    --theme-text: #e0e8f2;
    --theme-muted: #acbbcf;
    --theme-link: #8ac6ff;
    --theme-surface: #182331;
    --theme-surface-raised: #202e3e;
    --theme-border: #3b4e63;
    --theme-success-bg: #18392e;
    --theme-success-text: #9ddfc0;
    --theme-warning-bg: #3b311b;
    --theme-warning-text: #f1d18e;
    --theme-danger-text: #ffabb3;
    background: #111a25;
}
.theme-toggle {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    min-height: 32px;
    padding: 5px 9px;
    border: 1px solid #71869e;
    border-radius: 5px;
    font-size: 12px;
    white-space: nowrap;
}
.theme-toggle:hover { background: rgba(128, 166, 208, .16); }
.theme-toggle:focus-visible { outline: 2px solid #8ac6ff; outline-offset: 3px; }
.account-card > .theme-toggle { display: flex; margin: 0 0 20px auto; color: var(--theme-text, #263b4e); }
:root[data-theme="dark"] .account-page { background: #111a25; }
:root[data-theme="dark"] .validation-message { background: #42252f; }