/* Authentication and onboarding share the same surfaces and field rhythm. */
.auth-shell, .signup-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 440px);
    align-items: start;
    gap: var(--odo-space);
}
.signup-shell { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); }
.auth-hero, .signup-hero {
    min-width: 0;
    display: grid;
    align-content: start;
    gap: 20px;
    padding: clamp(24px, 4vw, 48px) 0;
}
.auth-kicker, .signup-kicker {
    width: fit-content;
    border-left: 3px solid var(--odo-blood);
    padding-left: 12px;
    color: var(--odo-steel);
    font-size: 0.75rem;
    font-weight: 650;
    letter-spacing: 0.07em;
    text-transform: uppercase;
}
.auth-hero h1, .signup-hero h1 {
    margin: 0;
    max-width: 540px;
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    line-height: 1.15;
    letter-spacing: -0.04em;
}
.auth-hero p, .signup-hero p { margin: 0; max-width: 480px; color: var(--odo-muted); }
.auth-card, .signup-card, .invite-card {
    min-width: 0;
    display: grid;
    gap: 20px;
    border: 1px solid var(--odo-border);
    border-top: 3px solid var(--odo-steel);
    border-radius: var(--odo-radius);
    background: var(--odo-surface);
    box-shadow: var(--odo-shadow);
    padding: clamp(20px, 3vw, 32px);
}
.auth-card h2, .signup-card h2, .invite-card h1 { margin: 0; }
.auth-form, .invite-form { display: grid; gap: 16px; }
.auth-field, .signup-field, .invite-field { display: grid; gap: 6px; min-width: 0; align-content: start; }
.auth-links, .signup-links { display: flex; flex-wrap: wrap; gap: 12px; color: var(--odo-muted); font-size: 0.875rem; }
.auth-links a, .signup-links a { font-weight: 600; }
.auth-links { padding-top: 16px; border-top: 1px solid var(--odo-border); }
.auth-links a { display: inline-flex; align-items: center; min-height: 44px; }
.signup-form { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.signup-actions, .signup-links { grid-column: 1 / -1; }
.signup-actions .btn { width: 100%; }
.signup-field small { font-weight: 400; }
.invite-shell { display: grid; place-items: start center; }
.invite-card { width: 100%; max-width: 620px; }
.invite-meta { color: var(--odo-muted); margin: 0; }
@media (max-width: 860px) {
    .auth-shell, .signup-shell { grid-template-columns: 1fr; }
    .auth-hero, .signup-hero { padding: 0 0 8px; gap: 12px; }
    .auth-hero h1, .signup-hero h1 { max-width: 620px; }
}
@media (max-width: 540px) {
    .signup-form { grid-template-columns: 1fr; }
    .auth-links { flex-direction: column; gap: 0; }
}