.auth-page {
    min-height: calc(100vh - 160px);
    display: grid;
    grid-template-columns: minmax(280px, .8fr) minmax(420px, 1.2fr);
    background: var(--cream);
}
.auth-intro {
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: clamp(45px, 7vw, 90px);
    background: var(--forest);
    color: white;
}
.auth-intro::after {
    content: "CH";
    position: absolute;
    right: -25px;
    bottom: -80px;
    color: rgba(255,255,255,.045);
    font: 600 18rem/1 Newsreader, serif;
}
.auth-intro h1 { max-width: 520px; margin: .2em 0; font: 600 clamp(3rem, 6vw, 6rem)/.92 Newsreader, serif; letter-spacing: -.04em; }
.auth-intro p:not(.eyebrow) { max-width: 480px; color: #e0e8df; font-size: 1.08rem; }
.auth-benefits { position: relative; z-index: 1; display: grid; gap: 12px; margin-top: 45px; }
.auth-benefits span { display: flex; align-items: center; gap: 10px; }
.auth-benefits span::before { content: "✓"; display: grid; place-items: center; width: 23px; height: 23px; border: 1px solid var(--gold); border-radius: 50%; color: var(--gold); font-size: .75rem; }
.auth-panel { display: grid; place-items: center; padding: clamp(35px, 7vw, 90px); }
.auth-card { width: min(100%, 560px); }
.auth-card h2 { margin: 0 0 8px; font-size: 2.4rem; }
.auth-card > p { margin-top: 0; color: var(--muted); }
.auth-form { display: grid; gap: 18px; margin-top: 30px; }
.auth-form .field-row { gap: 14px; }
.auth-form label > span { margin-bottom: 6px; }
.auth-form input { min-height: 50px; border: 1px solid var(--line); border-radius: 4px; }
.auth-form input:focus { border-color: var(--forest); outline: 3px solid rgba(36,76,59,.14); }
.auth-form .button { min-height: 52px; width: 100%; margin-top: 4px; }
.auth-switch { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); text-align: center; color: var(--muted); }
.auth-switch a { color: var(--forest); font-weight: 700; }
.checkbox-row { display: flex; align-items: flex-start; gap: 10px; cursor: pointer; }
.checkbox-row input { width: 18px; min-height: 18px; margin-top: 3px; }
.checkbox-row span { margin: 0; font-weight: 500; }
.field-validation-error, .validation-summary-errors { color: var(--danger); font-size: .86rem; font-weight: 600; }
.validation-summary-valid, .field-validation-valid { display: none; }
.password-note { display: block; margin-top: 5px; color: var(--muted); font-size: .78rem; }
@media (max-width: 820px) {
    .auth-page { grid-template-columns: 1fr; }
    .auth-intro { min-height: 330px; padding: 45px 25px; }
    .auth-intro h1 { font-size: 3.6rem; }
    .auth-benefits { margin-top: 25px; }
    .auth-panel { padding: 45px 20px 65px; }

    body:has(.auth-page-login) .site-header {
        min-height: 64px;
        padding: 6px 14px;
        align-items: center;
        gap: 10px;
    }
    body:has(.auth-page-login) .brand-logo {
        height: 48px;
        max-width: 190px;
    }
    body:has(.auth-page-login) .site-header nav { gap: 8px; }
    body:has(.auth-page-login) .header-book {
        padding: 8px 12px;
        min-height: 42px;
    }
    body:has(.auth-page-login) .site-menu > summary {
        min-height: 42px;
        min-width: 42px;
        padding: 7px 9px;
    }

    .auth-page-login .auth-panel {
        order: 1;
        place-items: start center;
        padding: 22px 20px 34px;
    }
    .auth-page-login .auth-card h2 { font-size: 2.1rem; }
    .auth-page-login .auth-form { margin-top: 22px; gap: 14px; }
    .auth-page-login .auth-intro {
        order: 2;
        min-height: auto;
        padding: 28px 20px 32px;
    }
    .auth-page-login .auth-intro h1 {
        margin: .15em 0 .25em;
        font-size: 2.35rem;
        line-height: .98;
    }
    .auth-page-login .auth-intro p:not(.eyebrow) { margin-bottom: 0; font-size: .98rem; }
    .auth-page-login .auth-benefits { display: none; }
    .auth-page-login .auth-intro::after { display: none; }
}