body.page-auth {
    --auth-modal-header-padding: 26px 28px 18px;
    --auth-modal-body-padding: 0 28px 28px;
    min-height: calc(100svh - var(--top-h));
    margin: 0;
    overflow-x: hidden;
    background: var(--soft-white);
    color: var(--jet-black);
}

body.page-auth::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    background: radial-gradient(circle at 16% 40%, rgba(var(--palette-primary-rgb), 0.13), transparent 28%),
        radial-gradient(circle at 83% 58%, rgba(var(--palette-primary-rgb), 0.09), transparent 30%);
}

.auth-page-shell {
    position: relative;
    z-index: 1;
    width: min(1200px, calc(100% - 64px));
    min-height: calc(100svh - var(--top-h));
    margin: 0 auto;
    padding: 28px 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(480px, 600px);
    align-items: center;
    gap: clamp(32px, 4vw, 64px);
}

.auth-page-back {
    position: absolute;
    top: 28px;
    left: 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 0 16px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: rgba(250, 250, 250, 0.84);
    color: var(--bold-blue);
    text-decoration: none;
    backdrop-filter: blur(16px);
    box-shadow: 0 8px 24px rgba(var(--palette-primary-rgb), 0.08);
    transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.auth-page-back:hover,
.auth-page-back:focus-visible {
    color: var(--jet-black);
    border-color: var(--color-border-strong);
    outline: none;
    transform: translateX(-3px);
    box-shadow: 0 12px 30px rgba(var(--palette-primary-rgb), 0.13);
}

.auth-brand-panel {
    max-width: 560px;
}

.auth-brand-mark {
    width: 84px;
    height: 84px;
    margin-bottom: 26px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(var(--palette-primary-rgb), 0.38);
    border-radius: 22px;
    background: var(--navy);
    box-shadow: 0 18px 42px rgba(var(--palette-primary-rgb), 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.auth-brand-mark img {
    width: 62px;
    height: 62px;
    object-fit: contain;
}

.auth-brand-panel h1 {
    margin: 0;
    color: var(--jet-black);
    font-size: clamp(2.4rem, 4.5vw, 4.5rem);
    line-height: 1;
    letter-spacing: -0.05em;
}

.auth-brand-panel h1 span {
    color: var(--bold-blue);
    text-shadow: none;
}

.auth-brand-lead {
    max-width: 520px;
    margin: 24px 0 34px;
    color: var(--color-muted-foreground);
    font-size: clamp(1.05rem, 1.7vw, 1.25rem);
    line-height: 1.65;
}

.auth-benefits {
    display: grid;
    gap: 12px;
}

.auth-benefit {
    display: grid;
    grid-template-columns: 46px 1fr;
    align-items: center;
    gap: 14px;
    padding: 14px 16px;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    background: rgba(250, 250, 250, 0.86);
    box-shadow: 0 10px 28px rgba(var(--palette-primary-rgb), 0.08);
    backdrop-filter: blur(12px);
}

.auth-benefit > i {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 13px;
    background: rgba(var(--palette-primary-rgb), 0.16);
    color: var(--bold-blue);
}

.auth-benefit div {
    display: grid;
    gap: 3px;
}

.auth-benefit strong {
    color: var(--color-foreground);
    font-size: 0.94rem;
}

.auth-benefit span {
    color: var(--color-muted-foreground);
    font-size: 0.79rem;
    line-height: 1.4;
}

.auth-page-card {
    position: relative;
    width: 100%;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: visible;
    border: 1px solid var(--color-border);
    border-radius: 28px;
    background: var(--color-surface);
    box-shadow: 0 32px 80px rgba(var(--palette-primary-rgb), 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.86);
    backdrop-filter: blur(28px) saturate(112%);
}

.page-auth #authModal .modal-body {
    overflow: visible;
}

.page-auth #authModal #registerForm.active {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 16px;
}

.page-auth #registerForm > :is(.auth-name-grid, #regSchoolGroup, .auth-consent, .form-actions) {
    grid-column: 1 / -1;
}

.page-auth #authModal :is(.form-input, .form-select) {
    min-height: 44px;
    padding: 10px 12px;
}

.page-auth #authModal .auth-tabs {
    margin-bottom: 18px;
}

.page-auth #authModal .auth-subtitle {
    max-width: none;
}

.page-auth #registerForm .auth-field-hint {
    font-size: .7rem;
    line-height: 1.3;
}

#authModal .auth-form {
    animation: authPageFormIn 0.3s ease both;
}

.auth-page-status {
    display: none;
    margin: -8px 0 18px;
    padding: 12px 14px;
    border: 1px solid rgba(105, 216, 255, 0.2);
    border-radius: 13px;
    background: var(--surface-2);
    color: var(--text-primary);
    font-size: 0.84rem;
    line-height: 1.45;
}

.auth-page-status:not(:empty) {
    display: block;
}

.auth-page-status[data-kind="error"] {
    border-color: var(--color-border);
    background: var(--surface-2);
    color: var(--color-error);
}

.auth-page-status[data-kind="success"] {
    border-color: var(--color-border);
    background: var(--surface-2);
    color: var(--color-success);
}

.auth-field-wrap {
    position: relative;
}

.auth-field-wrap > i {
    position: absolute;
    top: 50%;
    left: 15px;
    z-index: 1;
    color: var(--bold-blue);
    transform: translateY(-50%);
    pointer-events: none;
}

#authModal .auth-field-wrap .form-input {
    padding-left: 44px;
}

.auth-name-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.auth-field-hint {
    display: block;
    margin-top: 7px;
    color: var(--color-muted-foreground);
    font-size: 0.74rem;
}

.auth-consent {
    margin: 4px 0 0;
    color: var(--color-muted-foreground);
    font-size: 0.76rem;
    line-height: 1.45;
}

.auth-consent a {
    color: var(--bold-blue);
}

#authModal .auth-page-actions {
    margin-top: 4px;
}

#authModal .auth-page-actions .btn-primary {
    width: 100%;
    min-height: 52px;
}

.auth-page-orbit {
    position: fixed;
    z-index: 0;
    border: 1px solid rgba(var(--palette-primary-rgb), 0.08);
    border-radius: 50%;
    pointer-events: none;
}

.auth-page-orbit--one {
    width: 420px;
    height: 420px;
    top: -240px;
    right: 15%;
}

.auth-page-orbit--two {
    width: 680px;
    height: 680px;
    left: -420px;
    bottom: -440px;
}

@keyframes authPageFormIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (min-width: 961px) and (max-height: 800px) {
    body.page-auth {
        --auth-modal-header-padding: 20px 28px 14px;
        --auth-modal-body-padding: 0 28px 22px;
    }

    .auth-page-shell {
        padding-block: 16px;
    }

    .page-auth #authModal #registerForm.active {
        gap: 10px 16px;
    }

    .page-auth #regSchoolClassGroup .auth-field-hint {
        display: none;
    }
}

@media (max-width: 960px) {
    .auth-page-shell {
        width: min(680px, calc(100% - 32px));
        grid-template-columns: 1fr;
        align-items: start;
        gap: 36px;
        padding-top: 28px;
    }

    .auth-brand-panel {
        max-width: none;
    }

    .auth-brand-mark,
    .auth-benefits {
        display: none;
    }

    .auth-brand-panel h1 {
        font-size: clamp(3rem, 13vw, 5rem);
    }

    .auth-brand-lead {
        margin-bottom: 0;
    }

    .auth-page-card {
        min-height: 0;
        max-height: none;
    }
}

@media (max-width: 560px) {
    body.page-auth {
        --auth-modal-header-padding: 26px 22px 19px;
        --auth-modal-body-padding: 0 22px 28px;
    }

    .auth-page-shell {
        width: min(100% - 20px, 680px);
        padding: 20px 0;
        gap: 24px;
    }

    .auth-page-back {
        top: 18px;
        min-height: 40px;
    }

    .auth-page-back span {
        display: none;
    }

    .auth-brand-panel,
    .auth-brand-lead {
        display: none;
    }

    .auth-brand-panel h1 {
        font-size: 2.65rem;
    }

    .auth-page-card {
        min-height: 0;
        border-radius: 24px;
    }

    .auth-name-grid {
        gap: 12px;
    }

    .page-auth #authModal #registerForm.active {
        grid-template-columns: minmax(0, 1fr);
    }
}

@media (prefers-reduced-motion: reduce) {
    #authModal .auth-form,
    .auth-page-back {
        animation: none;
        transition-duration: 0.01ms;
    }
}