:root {
    --portal-bg: #f5f7fb;
    --portal-card-border: #e5e9f0;
    --portal-text-muted: #667085;
}

body {
    min-height: 100vh;
    background: var(--portal-bg);
    color: #1f2937;
}

.portal-navbar {
    background: #ffffff;
    box-shadow: 0 1px 8px rgba(15, 23, 42, 0.08);
}

.portal-main {
    width: min(1180px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 2rem 0 3rem;
}

.portal-hero {
    padding: clamp(1.5rem, 4vw, 3rem);
    background: linear-gradient(135deg, #ffffff 0%, #eef4ff 100%);
    border: 1px solid var(--portal-card-border);
    border-radius: 1rem;
}

.portal-card {
    border: 1px solid var(--portal-card-border);
    border-radius: 0.9rem;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.04);
}

.portal-muted {
    color: var(--portal-text-muted);
}

.announcement-list-item {
    padding: 1.15rem 0;
    border-bottom: 1px solid var(--portal-card-border);
}

.announcement-list-item:last-child {
    border-bottom: 0;
}

.announcement-body {
    line-height: 1.85;
}

@media (max-width: 575.98px) {
    .portal-main {
        width: min(100% - 1rem, 1180px);
        padding-top: 1rem;
    }

    .portal-hero {
        border-radius: 0.75rem;
    }
}