.auth-main {
    flex: 1 0 auto;
    width: 100%;
    min-height: 0;
    display: grid;
    place-items: center;
    padding: 3rem 1rem 0;
    background: linear-gradient(145deg, #f5f3ff 0%, #fff 48%, #fdf2f8 100%);
}

.auth-card {
    width: min(100%, 560px);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 1.25rem;
    box-shadow: 0 24px 70px rgba(44, 16, 77, .12);
    padding: clamp(1.25rem, 4vw, 2.5rem);
}

.auth-card-intro { text-align: center; }
.auth-brand-logo {
    display: block;
    width: 72px;
    height: 72px;
    object-fit: contain;
    margin: 0 auto .85rem;
}
.auth-card-intro h1 { margin: .8rem 0 .45rem; color: var(--gray-900); }
.auth-card-intro p { margin: 0 auto; max-width: 38rem; color: var(--gray-600); }

.auth-page-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .35rem;
    padding: .35rem;
    margin: 1.7rem 0 1.25rem;
    border-radius: .8rem;
    background: var(--gray-100);
}

.auth-page-tab {
    border: 0;
    border-radius: .55rem;
    padding: .75rem;
    background: transparent;
    color: var(--gray-600);
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}

.auth-page-tab.active {
    background: var(--white);
    color: var(--primary);
    box-shadow: 0 2px 8px rgba(23, 23, 23, .08);
}

.auth-page-form[hidden] { display: none; }
.auth-page-form .btn { margin-top: .5rem; }
.auth-seller-fields { padding: .85rem; margin: .25rem 0 1rem; border-radius: .75rem; background: var(--gray-50); }
.auth-account-type { margin-top: 1rem; }
.auth-account-type .form-label {
    display: block;
    margin-bottom: .65rem;
    color: var(--gray-700);
    font-size: .86rem;
    font-weight: 700;
}
.auth-account-type-options {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .65rem;
}
.auth-account-type-option {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    min-height: 2.9rem;
    padding: .6rem .9rem;
    border: 1px solid var(--gray-300);
    border-radius: 999px;
    color: var(--gray-700);
    font-size: .8rem;
    font-weight: 700;
    line-height: 1.25;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease, color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.auth-account-type-option::before {
    display: none;
}
.auth-account-type-option > span {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 1.25rem;
    line-height: 1.2;
    text-align: center;
}
.auth-account-type-option:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-100);
    color: var(--primary-dark);
    box-shadow: 0 0 0 2px rgba(109, 40, 217, .1);
    transform: translateY(-1px);
}
.auth-account-type-option:has(input:checked)::before {
    display: none;
}
.auth-account-type-option input {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
    opacity: 0;
}
.auth-account-type-option input:focus-visible {
    position: absolute;
}
.auth-account-type-option:has(input:focus-visible) {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}
.auth-business-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .65rem;
}
.auth-business-location-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .65rem;
}
.auth-name-row {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: .65rem;
}
.auth-card-links { display: flex; justify-content: center; gap: .55rem; margin: 1.5rem 0 0; padding-bottom: .5rem; font-size: .9rem; }
.auth-card-links a { color: var(--primary); font-weight: 600; }
.auth-page-feedback { margin-bottom: 1rem; padding: .75rem .9rem; border-radius: .65rem; font-size: .9rem; }
.auth-page-feedback[data-type="error"] { color: #991b1b; background: #fef2f2; }
.auth-page-feedback[data-type="success"] { color: #166534; background: #f0fdf4; }
.form-label-optional {
    color: var(--gray-500);
    font-size: .78em;
    font-weight: 500;
}

@media (max-width: 560px) {
    .auth-main {
        min-height: auto;
        place-items: start center;
        padding: 1.25rem .75rem 0;
    }
    .auth-card { border-radius: 1rem; }
    .form-row-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .65rem; }
    .auth-account-type-options { gap: .5rem; }
    .auth-account-type-option { min-height: 3.05rem; padding-inline: .55rem; font-size: .72rem; }
    .auth-business-row { gap: .5rem; }
    .auth-business-location-row {
        grid-template-columns: 1fr;
        gap: .5rem;
    }
    .auth-name-row { gap: .5rem; }
}

@media (max-width: 768px) {
    body.auth-page {
        display: flex;
        flex-direction: column;
        min-height: 100dvh;
        padding-bottom: 0;
    }

    body.auth-page .mobile-bottom-nav {
        display: block;
        z-index: 1500;
        padding-bottom: env(safe-area-inset-bottom);
    }

    body.auth-page .bottom-nav-items {
        min-height: 62px;
        padding: .3rem .35rem 0;
    }

    body.auth-page .bottom-nav-item {
        min-height: 54px;
        padding-bottom: .35rem;
    }
}