/* ============================================
   School Updates
   Page-scoped styles (su- prefix). Reuses the
   design tokens from styles.css.
   ============================================ */

.su-hidden {
    display: none !important;
}

/* ---------- buttons ---------- */
.su-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 14px 28px;
    border-radius: var(--radius-full);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    border: 1px solid transparent;
    transition: transform var(--transition-fast), box-shadow var(--transition-normal),
        background var(--transition-normal);
}

.su-btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    box-shadow: var(--shadow-primary);
}

.su-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 34px -12px rgba(255, 75, 75, 0.55);
}

.su-btn-primary[disabled] {
    opacity: 0.6;
    cursor: progress;
    transform: none;
}

/* ---------- hero ---------- */
.su-hero {
    position: relative;
    overflow: hidden;
    padding: 150px 0 70px;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 55%, #fff5f5 100%);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.su-hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    pointer-events: none;
}

.su-glow-one {
    width: 520px;
    height: 520px;
    top: -250px;
    right: -130px;
    background: radial-gradient(circle, rgba(255, 75, 75, 0.38), transparent 70%);
}

.su-glow-two {
    width: 460px;
    height: 460px;
    bottom: -250px;
    left: -140px;
    background: radial-gradient(circle, rgba(59, 130, 246, 0.22), transparent 70%);
}

.su-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 760px;
    text-align: center;
}

.su-hero-title {
    font-size: clamp(2.1rem, 5.2vw, 3.4rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: -0.03em;
    color: var(--text-dark);
    margin: 18px 0 18px;
}

.su-hero-title .highlight {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.su-hero-sub {
    font-size: 1.06rem;
    color: var(--text-medium);
    line-height: 1.7;
    max-width: 60ch;
    margin: 0 auto;
}

/* ---------- section + toolbar ---------- */
.su-section {
    padding: 64px 0 96px;
    background: var(--bg-light);
}

.su-feed-wrap {
    max-width: 880px;
}

.su-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 32px;
}

.su-toolbar h2 {
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.su-count {
    color: var(--text-light);
    font-size: 0.97rem;
    margin: 0;
}

.su-search {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    border: 1px solid rgba(15, 23, 42, 0.09);
    border-radius: var(--radius-full);
    padding: 12px 18px;
    min-width: 280px;
    color: var(--text-light);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.su-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 75, 75, 0.12);
}

.su-search input {
    border: none;
    outline: none;
    background: transparent;
    font-family: inherit;
    font-size: 0.98rem;
    color: var(--text-dark);
    width: 100%;
}

/* ---------- feed cards ---------- */
.su-feed {
    display: flex;
    flex-direction: column;
    gap: 22px;
}

.su-feed:empty {
    display: none;
}

.su-card {
    background: #fff;
    border: 1px solid #eef2f7;
    border-radius: var(--radius-xl);
    padding: 28px 30px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.su-card:hover {
    box-shadow: var(--shadow-md);
    border-color: #f5dede;
}

.su-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
}

.su-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
    border: 2px solid #fff;
    box-shadow: var(--shadow-sm);
    background: var(--bg-blue-tint);
}

.su-avatar-fallback {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: #fff;
    background: var(--primary-gradient);
}

.su-author {
    min-width: 0;
}

.su-author-name {
    display: block;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-dark);
}

.su-date {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 2px;
}

.su-title {
    font-size: 1.32rem;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-dark);
    margin: 0 0 10px;
}

.su-content {
    font-size: 1rem;
    line-height: 1.72;
    color: var(--text-medium);
    white-space: pre-wrap;
    overflow-wrap: anywhere;
    margin: 0;
}

.su-image {
    margin-top: 18px;
    border: 1px solid #eef2f7;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-light);
}

.su-image img {
    width: 100%;
    max-height: 460px;
    object-fit: contain;
    background: #fff;
}

.su-link {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 18px;
    padding: 14px 16px;
    border: 1px solid #eef2f7;
    border-radius: var(--radius-lg);
    background: var(--bg-light);
    transition: border-color var(--transition-normal), background var(--transition-normal),
        transform var(--transition-fast);
}

.su-link:hover {
    border-color: var(--primary);
    background: #fff;
    transform: translateY(-1px);
}

.su-link-icon {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    background: rgba(255, 75, 75, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.su-link-text {
    min-width: 0;
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--text-dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.su-foot {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid #f1f5f9;
    font-size: 0.88rem;
    color: var(--text-light);
}

.su-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.su-more-wrap {
    display: flex;
    justify-content: center;
    margin-top: 34px;
}

/* ---------- skeleton ---------- */
.su-skeleton {
    pointer-events: none;
}

.su-skeleton-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.su-skeleton-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    flex-shrink: 0;
    background: linear-gradient(90deg, #f1f5f9 25%, #e7edf5 37%, #f1f5f9 63%);
    background-size: 400% 100%;
    animation: su-shimmer 1.4s ease-in-out infinite;
}

.su-skeleton-line {
    display: block;
    height: 14px;
    border-radius: 8px;
    margin-bottom: 10px;
    background: linear-gradient(90deg, #f1f5f9 25%, #e7edf5 37%, #f1f5f9 63%);
    background-size: 400% 100%;
    animation: su-shimmer 1.4s ease-in-out infinite;
}

.su-skeleton-line.short {
    width: 40%;
    margin-bottom: 0;
    flex: 1;
}

.su-skeleton-line.shorter {
    width: 60%;
}

@keyframes su-shimmer {
    0% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0 50%;
    }
}

/* ---------- states ---------- */
.su-state {
    text-align: center;
    padding: 64px 24px;
    border: 1px dashed rgba(15, 23, 42, 0.14);
    border-radius: var(--radius-xl);
    background: #fff;
}

.su-state-icon {
    font-size: 2.4rem;
    margin-bottom: 12px;
}

.su-state h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.su-state p {
    color: var(--text-medium);
    max-width: 54ch;
    margin: 0 auto 22px;
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
    .su-hero {
        padding: 132px 0 60px;
    }
}

@media (max-width: 640px) {
    .su-hero {
        padding: 120px 0 52px;
    }

    .su-section {
        padding: 48px 0 72px;
    }

    .su-toolbar {
        align-items: stretch;
    }

    .su-search {
        min-width: 0;
        width: 100%;
    }

    .su-card {
        padding: 22px 20px;
        border-radius: var(--radius-lg);
    }

    .su-title {
        font-size: 1.18rem;
    }

    .su-image img {
        max-height: 320px;
    }
}