/* ── PI Hero ── */
    .pi-hero {
      padding: 5rem 0 2rem;
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 3rem;
      align-items: start;
    }

    .pi-photo-wrap {
      position: relative;
      width: 20rem;
      height: 20rem;
      border-radius: 1.5rem;
      overflow: hidden;
      border: 2px solid rgba(255,255,255,.35);
      box-shadow: 0 16px 50px rgba(0,0,0,.5);
      flex-shrink: 0;
    }

    .pi-bg-blur {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      filter: blur(20px) brightness(0.35) saturate(0.7);
      transform: scale(1.12);
      z-index: 0;
      pointer-events: none;
    }

    .pi-photo {
      position: relative;
      z-index: 1;
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .pi-info { padding-top: .5rem; }

    /* Tighten the gap between the PI hero and the Current Members section */
    .pi-hero + .section { padding-top: 0.5rem; }

    .pi-name {
      font-size: clamp(2rem, 4vw, 3.2rem);
      font-weight: 800;
      letter-spacing: -.03em;
      color: var(--text);
      margin: 1rem 0 .5rem;
    }

    .pi-title {
      font-size: 1rem;
      color: var(--muted);
      line-height: 1.65;
      margin-bottom: 1.5rem;
    }

    .pi-fellows {
      display: flex;
      flex-wrap: wrap;
      gap: .65rem;
      margin-bottom: 1.75rem;
    }

    .pi-fellow-chip {
      padding: .45rem .9rem;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: rgba(255,255,255,.07);
      font-size: .8rem;
      color: var(--muted);
      font-weight: 600;
    }

    .pi-badges {
      display: flex;
      flex-wrap: wrap;
      gap: .65rem;
      margin-bottom: 2rem;
    }

    .pi-badge {
      padding: .45rem .9rem;
      border-radius: 999px;
      border: 1px solid rgba(125,211,252,.35);
      background: rgba(56,189,248,.12);
      font-size: .8rem;
      color: var(--accent-on-dark);
      font-weight: 700;
    }

    .pi-cv-row {
      display: flex;
      gap: .75rem;
    }

    .pi-cv-row .btn {
      font-size: .92rem;
      padding: .75rem 1.5rem;
    }

    /* ── Members ── */
    .member-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0,1fr));
      gap: 1.25rem;
    }

    .member-card {
      border: 1px solid var(--line);
      background: rgba(255,255,255,.06);
      border-radius: 1.4rem;
      overflow: hidden;
      transition: transform .2s, background .2s;
      box-shadow: var(--shadow);
    }

    .member-card:hover {
      transform: translateY(-4px);
      background: rgba(255,255,255,.09);
    }

    .member-avatar {
      width: 100%;
      aspect-ratio: 1 / 1;
      background: linear-gradient(135deg, #1e293b, #0f172a);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--accent-bright);
      letter-spacing: -.02em;
    }

    .member-photo {
      width: 100%;
      aspect-ratio: 1 / 1;
      object-fit: cover;
      object-position: top center;
      display: block;
    }

    .member-body {
      padding: 1.1rem 1.2rem 1.3rem;
    }

    .member-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text);
      margin: 0 0 .3rem;
    }

    .member-role {
      display: inline-block;
      padding: .3rem .75rem;
      border-radius: 999px;
      border: 1px solid rgba(125,211,252,.3);
      background: rgba(56,189,248,.1);
      font-size: .73rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: .12em;
      color: var(--accent-bright);
      margin-bottom: .7rem;
    }

    .member-topic {
      font-size: .88rem;
      color: var(--muted-2);
      line-height: 1.5;
    }

    /* ── Alumni ── */
    /* ── Alumni person grid ── */
    .alumni-person-grid {
      display: grid;
      grid-template-columns: repeat(6, minmax(0, 1fr));
      gap: 1rem;
    }

    .alumni-person {
      border: 1px solid var(--line);
      background: rgba(255,255,255,.05);
      border-radius: 1.1rem;
      overflow: hidden;
      text-align: center;
      transition: background .2s, transform .2s;
    }

    .alumni-person:hover {
      background: rgba(255,255,255,.09);
      transform: translateY(-3px);
    }

    .alumni-person-photo {
      width: 100%;
      aspect-ratio: 1 / 1;
      object-fit: cover;
      object-position: top center;
      display: block;
      background: linear-gradient(135deg, #1e293b, #0f172a);
    }

    .alumni-person-initials {
      width: 100%;
      aspect-ratio: 1 / 1;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--accent-bright);
      background: linear-gradient(135deg, #1e293b, #0f172a);
    }

    .alumni-person-body {
      padding: .6rem .5rem .75rem;
    }

    .alumni-person-name {
      font-size: .78rem;
      font-weight: 700;
      color: var(--text);
      line-height: 1.3;
      margin-bottom: .25rem;
    }

    .alumni-person-year {
      font-size: .68rem;
      color: var(--accent-bright);
      font-weight: 700;
      margin-bottom: .2rem;
    }

    .alumni-person-dest {
      font-size: .7rem;
      color: var(--muted-2);
      line-height: 1.35;
    }

    /* ── Divider kicker ── */
    .subsection-head {
      display: flex;
      align-items: center;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }

    .subsection-head::after {
      content: '';
      flex: 1;
      height: 1px;
      background: var(--line);
    }

    @media (max-width: 1080px) {
      .pi-hero { grid-template-columns: 1fr; }
      .pi-photo-wrap { width: 100%; height: 22rem; }
      .member-grid { grid-template-columns: repeat(2, 1fr); }
      .alumni-person-grid { grid-template-columns: repeat(4, 1fr); }
    }

    @media (max-width: 820px) {
      .member-grid { grid-template-columns: 1fr 1fr; }
      .alumni-person-grid { grid-template-columns: repeat(3, 1fr); }
    }

    @media (max-width: 560px) {
      .member-grid { grid-template-columns: 1fr; }
      .alumni-person-grid { grid-template-columns: repeat(2, 1fr); }
    }

    /* ── Light theme overrides ── */
    :root[data-theme="light"] .pi-photo-wrap { border-color: rgba(39, 46, 104, 0.18); }
    :root[data-theme="light"] .pi-fellow-chip { background: rgba(255, 255, 255, 0.75); }
    :root[data-theme="light"] .pi-badge,
    :root[data-theme="light"] .member-role {
      border-color: rgba(37, 99, 235, 0.45);
      background: rgba(37, 99, 235, 0.16);
    }
    :root[data-theme="light"] .member-card { background: rgba(255, 255, 255, 0.75); }
    :root[data-theme="light"] .member-card:hover { background: rgba(255, 255, 255, 0.95); }
    :root[data-theme="light"] .alumni-person { background: rgba(255, 255, 255, 0.7); }
    :root[data-theme="light"] .alumni-person:hover { background: rgba(255, 255, 255, 0.95); }
    :root[data-theme="light"] .member-avatar,
    :root[data-theme="light"] .alumni-person-photo,
    :root[data-theme="light"] .alumni-person-initials {
      background: linear-gradient(135deg, #d7e3f6, #bcd0ee);
    }

    /* ── Phone refinements ── */
    @media (max-width: 820px) {
      /* smaller gap under the navbar */
      .pi-hero { padding-top: 1.75rem; }
      /* clearer separation between the PI block and the "Current Members" section */
      .pi-hero + .section { padding-top: 2rem; }
    }