/* ── Hub Hero ── */
.hub-hero {
    padding: 140px 0 60px;
    text-align: center;
}
.hub-hero h1 { margin: 20px 0 16px; }
.hub-hero .subtitle { max-width: 560px; margin: 0 auto 48px; }

.hub-stats {
    display: inline-flex;
    align-items: center;
    gap: 0;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 20px 32px;
    flex-wrap: wrap;
    justify-content: center;
}
.hub-stat { padding: 8px 24px; text-align: center; }
.hub-stat strong { display: block; font-size: 1.5rem; font-weight: 800; color: var(--text-main); }
.hub-stat span { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }
.hub-stat-divider { width: 1px; height: 40px; background: var(--border-color); }

/* ── Controls ── */
.hub-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding-top: 16px;
    padding-bottom: 48px;
}
.hub-search {
    width: 100%;
    max-width: 480px;
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 14px 20px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}
.hub-search:focus {
    outline: none;
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(62,160,85,0.15);
}
.hub-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}
.hub-filter-btn {
    padding: 9px 20px;
    border-radius: 100px;
    border: 1px solid var(--border-color);
    background: var(--bg-surface-elevated);
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}
.hub-filter-btn:hover { color: var(--text-main); border-color: rgba(62,160,85,0.4); }
.hub-filter-btn.active {
    background: linear-gradient(135deg, var(--c-primary), #2d8a46);
    border-color: transparent;
    color: white;
    box-shadow: 0 4px 16px rgba(62,160,85,0.3);
}

/* ── Grid ── */
.hub-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    padding-bottom: 80px;
}

/* ── Card ── */
.hub-card {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.hub-card.hidden { display: none; }
.hub-card.open { border-color: rgba(62,160,85,0.4); }

.hub-card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 28px;
    cursor: pointer;
    user-select: none;
}
.hub-card-header:hover { background: rgba(255,255,255,0.02); }
.hub-icon-wrap { font-size: 2rem; line-height: 1; flex-shrink: 0; }
.hub-card-header > div:nth-child(2) { flex: 1; }
.hub-card-header h3 { font-size: 1.1rem; margin: 4px 0 0; color: var(--text-main); }

.hub-level-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 3px 10px;
    border-radius: 100px;
    display: inline-block;
}
.primary-tag   { background: rgba(100,160,255,0.15); color: #80baff; border: 1px solid rgba(100,160,255,0.2); }
.secondary-tag { background: rgba(255,200,80,0.15);  color: #ffd87a; border: 1px solid rgba(255,200,80,0.2); }
.vce-tag       { background: rgba(200,100,255,0.15); color: #d87aff; border: 1px solid rgba(200,100,255,0.2); }
.hsc-tag       { background: rgba(255,130,80,0.15);  color: #ffa560; border: 1px solid rgba(255,130,80,0.2); }
.test-tag      { background: rgba(62,160,85,0.15);   color: #7dd99c; border: 1px solid rgba(62,160,85,0.25); }

.hub-expand-btn {
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--c-primary-light);
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.3s ease, background 0.2s ease;
    line-height: 1;
}
.hub-card.open .hub-expand-btn { transform: rotate(45deg); background: rgba(62,160,85,0.15); }

/* ── Expanded Body ── */
.hub-card-body {
    display: none;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
    padding: 0 28px 24px;
    border-top: 1px solid var(--border-color);
}
.hub-card.open .hub-card-body { display: grid; }

.hub-col h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin: 20px 0 12px;
}
.hub-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 7px;
}
.hub-col ul li {
    font-size: 0.875rem;
    color: var(--text-muted);
    padding-left: 14px;
    position: relative;
    line-height: 1.4;
}
.hub-col ul li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--c-primary-light);
    font-weight: 700;
}
.hub-col ul li strong { color: var(--text-main); }

/* ── Footer ── */
.hub-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 28px;
    border-top: 1px solid var(--border-color);
    background: rgba(0,0,0,0.15);
}
.hub-demand {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* ── Bottom CTA ── */
.hub-bottom-cta { padding: 0 0 100px; }
.hub-cta-inner { padding: 64px; position: relative; overflow: hidden; }

/* ── Responsive ── */
@media (max-width: 1024px) {
    .hub-card-body { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .hub-grid { grid-template-columns: 1fr; }
    .hub-stat-divider { display: none; }
    .hub-card-body { grid-template-columns: 1fr; }
    .hub-cta-inner { padding: 40px 24px; }
}