.login-preview-page {
    --login-primary: var(--color-primary, #2563eb);
    --login-primary-hover: var(--color-primary-hover, #1d4ed8);
    --login-primary-active: var(--color-primary-active, #1e40af);
    --login-primary-soft: var(--color-primary-soft-bg, #eff6ff);
    --login-ink: var(--text-primary, #0f172a);
    --login-muted: var(--text-secondary, #64748b);
    --login-line: var(--border-color, #e2e8f0);
    --login-paper: var(--surface-bg, #ffffff);
    position: relative;
    display: grid;
    max-width: none !important;
    min-height: 640px;
    place-items: center;
    padding: 48px 24px 64px !important;
    color: var(--login-ink);
    background:
        radial-gradient(ellipse at 50% 0, rgba(37, 99, 235, 0.045), transparent 65%),
        var(--body-bg, #f8fafc);
}

.login-preview-shell {
    width: min(100%, 600px);
    border: 1px solid var(--login-line);
    border-radius: 24px;
    background: var(--login-paper);
    box-shadow: 0 16px 56px rgba(15, 23, 42, 0.055);
}

.login-preview-panel {
    padding: 40px 48px 44px;
}

.login-preview-panel-head {
    display: flex;
    gap: 14px;
    align-items: center;
    margin-bottom: 30px;
}

.login-preview-head-icon {
    display: grid;
    flex: none;
    width: 46px;
    height: 46px;
    place-items: center;
    border-radius: 13px;
    color: var(--login-primary);
    background: var(--login-primary-soft);
    font-size: 1.15rem;
}

.login-preview-panel-title {
    margin: 0 0 8px;
    color: var(--login-ink);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.login-preview-panel-copy {
    margin: 0;
    color: var(--login-muted);
    font-size: 0.88rem;
}

.login-preview-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 28px;
    border-bottom: 1px solid var(--login-line);
}

.login-preview-tab {
    min-height: 48px;
    border: 0;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    color: var(--login-muted);
    background: transparent;
    font-weight: 700;
    transition: background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.login-preview-tab.is-active {
    color: var(--login-primary-active);
    background: transparent;
    border-bottom-color: var(--login-primary);
}

[data-login-section][hidden] {
    display: none !important;
}

.login-preview-course-context {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 28px;
    padding: 18px;
    border: 1px solid var(--login-line);
    border-radius: 12px;
    background: var(--login-primary-soft);
}

.login-preview-course-mark {
    display: grid;
    flex: none;
    width: 40px;
    height: 40px;
    place-items: center;
    border-radius: 10px;
    color: var(--login-primary-active);
    background: var(--login-paper);
    font-size: 1rem;
}

.login-preview-course-label {
    display: block;
    margin-bottom: 1px;
    color: var(--login-muted);
    font-size: 0.73rem;
}

.login-preview-course-context > span:nth-child(2) {
    flex: 1;
    min-width: 0;
}

.login-preview-course-name {
    display: block;
    min-width: 0;
    color: var(--login-ink);
    font-size: 1rem;
    font-weight: 750;
    line-height: 1.6;
    overflow-wrap: anywhere;
}

.login-preview-change-course {
    flex: none;
    margin-left: auto;
    border: 0;
    color: var(--login-primary-hover);
    background: transparent;
    font-size: 0.8rem;
    font-weight: 700;
    white-space: nowrap;
}

.login-preview-recent {
    margin-bottom: 17px;
}

.login-preview-recent-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    color: var(--login-muted);
    font-size: 0.79rem;
}

.login-preview-recent-clear {
    border: 0;
    color: var(--login-muted);
    background: transparent;
    font-size: 0.76rem;
}

.login-preview-recent-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
}

.login-preview-recent-item {
    min-width: 0;
    padding: 10px 11px;
    overflow: hidden;
    border: 1px solid var(--login-line);
    border-radius: 10px;
    color: var(--login-ink);
    background: var(--login-paper);
    text-align: left;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.login-preview-recent-item:hover,
.login-preview-recent-item:focus-visible {
    border-color: #93c5fd;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

.login-preview-field {
    margin-bottom: 22px;
}

.login-preview-field label {
    display: block;
    margin-bottom: 9px;
    color: var(--login-ink);
    font-size: 0.86rem;
    font-weight: 700;
}

.login-preview-field .form-control {
    min-height: 52px;
    padding: 12px 15px;
    border-color: var(--login-line);
    border-radius: 10px;
    color: var(--login-ink);
    background: var(--login-paper);
}

.login-preview-field .form-control::placeholder {
    color: var(--text-muted, #94a3b8);
}

.login-preview-field .form-control:focus {
    border-color: var(--login-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.login-preview-field-help {
    margin-top: 5px;
    color: var(--login-muted);
    font-size: 0.76rem;
}

.login-preview-remember {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 17px;
    color: var(--login-muted);
    font-size: 0.8rem;
}

.login-preview-remember input {
    flex: none;
    accent-color: var(--login-primary);
}

.login-preview-remember small {
    margin-left: 4px;
    color: var(--text-muted, #94a3b8);
}

.login-preview-submit {
    width: 100%;
    min-height: 48px;
    border: 0;
    border-radius: 11px;
    color: #fff;
    background: var(--login-primary);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.12);
    font-weight: 700;
    transition: background-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.login-preview-submit:hover,
.login-preview-submit:focus-visible {
    color: #fff;
    background: var(--login-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.24);
}

.login-preview-alert {
    margin-bottom: 17px;
    padding: 11px 13px;
    border: 1px solid #fecaca;
    border-radius: 10px;
    color: var(--color-danger-soft-fg, #991b1b);
    background: var(--color-danger-soft-bg, #fef2f2);
    font-size: 0.82rem;
    line-height: 1.5;
}

.login-preview-complete {
    display: grid;
    min-height: 320px;
    place-items: center;
    padding: 38px;
    text-align: center;
}

.login-preview-complete-spinner {
    width: 42px;
    height: 42px;
    margin: 0 auto 18px;
    border: 4px solid #dbeafe;
    border-top-color: var(--login-primary);
    border-radius: 50%;
    animation: login-preview-spin 0.8s linear infinite;
}

@keyframes login-preview-spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 576px) {
    .login-preview-page {
        display: block;
        min-height: 0;
        padding: 24px 16px 40px !important;
    }

    .login-preview-shell {
        border-radius: 18px;
    }

    .login-preview-panel {
        padding: 28px 22px 30px;
    }

    .login-preview-panel-head {
        margin-bottom: 20px;
    }

    .login-preview-panel-title {
        font-size: 1.4rem;
    }

    .login-preview-course-context {
        flex-wrap: wrap;
        padding: 14px;
    }

    .login-preview-course-mark {
        display: none;
    }

    .login-preview-field .form-control {
        font-size: 0.9rem;
    }

    .login-preview-recent-list {
        grid-template-columns: 1fr;
    }
}

@media (prefers-reduced-motion: reduce) {
    .login-preview-tab,
    .login-preview-recent-item,
    .login-preview-submit {
        transition: none;
    }

    .login-preview-complete-spinner {
        animation: none;
    }
}