/* ==========================================================================
   CDI site layout. Built on tokens.css; the design's inline styles are
   expressed here as classes so the markup stays readable.
   Grid rule of the system: 2px ink rules separate major blocks, 2px
   --color-divider separates minor ones, 1px neutral-300 separates list rows.
   ========================================================================== */

/* Three fixed stages, WordPress-style, rather than one continuously fluid
   layout: desktop >=1025px, tablet 768-1024px, mobile <=767px.
   Past --maxw the sheet stops growing and centres, so line lengths stay
   readable on ultrawide monitors instead of stretching edge to edge. */
:root { --pad: 40px; --maxw: 1440px; }

/* The area outside the sheet is a shade darker so the centred column reads
   as a deliberate page, not a broken full-bleed layout. */
body { background: var(--color-neutral-200); }

.app {
  min-height: 100vh; display: flex; flex-direction: column;
  max-width: var(--maxw); margin: 0 auto; width: 100%;
  background: var(--color-bg);
  border-left: 2px solid var(--color-text);
  border-right: 2px solid var(--color-text);
}
/* Below the cap there is no visible margin, so the framing rules would just
   look like stray lines against the viewport edge. */
@media (max-width: 1444px) {
  .app { border-left: 0; border-right: 0; }
}

.page { display: flex; flex-direction: column; }

/* ── header ─────────────────────────────────────────────────────────────── */
.site-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 18px var(--pad);
  border-bottom: 2px solid var(--color-text);
  position: sticky; top: 0; background: var(--color-bg); z-index: 20;
}
.brand { display: flex; align-items: center; gap: 14px; cursor: pointer; background: none; border: 0; padding: 0; font: inherit; color: inherit; text-align: left; }
.brand:hover .brand-zh { color: var(--color-accent); }
.brand-mark { width: 34px; height: 34px; flex: none; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-zh { font-weight: 800; font-size: 15px; }
.brand-en { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--color-neutral-700); }

.site-nav { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: 12px 24px; }
.navl {
  background: transparent; border: 0; font-family: inherit; font-size: 13px;
  font-weight: 600; cursor: pointer; padding: 4px 0; white-space: nowrap;
  color: var(--color-neutral-700); border-bottom: 2px solid transparent;
}
.navl:hover { color: var(--color-accent); }
.navl.is-active { color: var(--color-text); border-bottom-color: var(--color-accent); }

.nav-toggle { display: none; }

/* ── shared pieces ──────────────────────────────────────────────────────── */
.rowlink { cursor: pointer; display: block; width: 100%; text-align: left; background: none; border: 0; font: inherit; color: inherit; }
.rowlink:hover { background: var(--color-accent-100); }

.linkish { cursor: pointer; background: none; border: 0; font: inherit; padding: 0; color: var(--color-accent-700); font-weight: 600; font-size: 13px; }
.linkish:hover { color: var(--color-accent); }

.media { background: var(--color-neutral-300); overflow: hidden; display: block; }
.media img { width: 100%; height: 100%; object-fit: cover; }

.section-head { padding: 48px var(--pad) 16px; }
.section-head h2 { margin: 0; font-size: 24px; font-weight: 800; }
.sub { color: var(--color-neutral-600); font-weight: 600; }

.page-head {
  padding: 64px var(--pad) 40px; border-bottom: 2px solid var(--color-text);
  display: flex; flex-direction: column; gap: 20px;
}
.page-head h1 { margin: 0; font-size: 52px; line-height: 1.05; font-weight: 800; }
.page-head .lede { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; max-width: 1000px; }
.page-head .lede p { margin: 0; text-wrap: pretty; }
.page-head .lede .zh { font-size: 17px; line-height: 1.6; }
.page-head .lede .en { font-size: 15px; line-height: 1.7; color: var(--color-neutral-800); }

.backbar { padding: 24px var(--pad); border-bottom: 2px solid var(--color-divider); }

/* ── home ───────────────────────────────────────────────────────────────── */
.hero { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 2px solid var(--color-text); }
.hero-copy {
  padding: 64px var(--pad); display: flex; flex-direction: column; gap: 24px;
  justify-content: center; border-right: 2px solid var(--color-text);
}
.kicker { font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--color-accent-700); font-weight: 700; }
.hero-copy h1 { margin: 0; font-size: 46px; line-height: 1.08; font-weight: 800; }
.hero-copy .en { margin: 0; font-size: 17px; line-height: 1.5; color: var(--color-neutral-800); }
.hero-media { min-height: 460px; }
.tagrow { display: flex; gap: 10px; flex-wrap: wrap; }
.tagrow .tag { white-space: nowrap; }
.btnrow { display: flex; gap: 12px; padding-top: 8px; flex-wrap: wrap; }
.btnrow .btn { white-space: nowrap; }

.mission {
  padding: 48px var(--pad); border-bottom: 2px solid var(--color-text);
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
}
.mission p { margin: 0; text-wrap: pretty; }
.mission .zh { font-size: 21px; line-height: 1.5; font-weight: 600; }
.mission .en { font-size: 15px; line-height: 1.7; color: var(--color-neutral-800); }

.area-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 2px solid var(--color-divider); border-bottom: 2px solid var(--color-text);
  margin: 16px var(--pad) 48px;
}
.area-cell { display: flex; flex-direction: column; border-bottom: 2px solid var(--color-divider); }
.area-cell:not(:nth-child(3n)) { border-right: 2px solid var(--color-divider); }
.area-cell .media { height: 180px; }
.area-cell-txt { padding: 18px 20px; display: flex; flex-direction: column; gap: 4px; }
.area-cell-zh { font-size: 18px; font-weight: 700; }
.area-cell-en { font-size: 13px; color: var(--color-neutral-700); }

.home-split { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 2px solid var(--color-text); }
.home-col { padding: 40px var(--pad); display: flex; flex-direction: column; gap: 20px; }
.home-col:first-child { border-right: 2px solid var(--color-divider); }
.home-col-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
.home-col-head h2 { margin: 0; font-size: 22px; font-weight: 800; }
.stack { display: flex; flex-direction: column; }

.pub-mini {
  padding: 14px 8px; border-top: 1px solid var(--color-neutral-300);
  display: grid; grid-template-columns: 52px 1fr; gap: 14px; align-items: baseline;
}
.pub-mini .yr { font-size: 13px; color: var(--color-neutral-600); font-weight: 600; }
.pub-mini .bd { display: flex; flex-direction: column; gap: 3px; }
.pub-mini .t { font-size: 15px; font-weight: 600; line-height: 1.4; }
.pub-mini .v { font-size: 13px; color: var(--color-neutral-700); line-height: 1.4; }

.upd-mini {
  padding: 14px 0; border-top: 1px solid var(--color-neutral-300);
  display: grid; grid-template-columns: 76px 1fr; gap: 14px;
}
.upd-mini .d { font-size: 13px; color: var(--color-neutral-600); font-weight: 600; }
.upd-mini .bd { display: flex; flex-direction: column; gap: 3px; }
.upd-mini .t { font-size: 15px; line-height: 1.45; }
.upd-mini .s { font-size: 13px; color: var(--color-neutral-700); line-height: 1.45; }

/* ── research ───────────────────────────────────────────────────────────── */
.area-rows { display: flex; flex-direction: column; padding: 0 var(--pad) 48px; }
.area-row {
  display: grid; grid-template-columns: 56px 220px 1fr 1.1fr 24px; gap: 24px;
  padding: 24px 8px; border-bottom: 2px solid var(--color-divider); align-items: center;
}
.area-row .num { font-size: 13px; font-weight: 700; color: var(--color-accent); }
.area-row .media { height: 120px; }
.area-row .names { display: flex; flex-direction: column; gap: 4px; }
.area-row .names .zh { font-size: 22px; font-weight: 700; }
.area-row .names .en { font-size: 14px; color: var(--color-neutral-700); }
.area-row .descs { display: flex; flex-direction: column; gap: 6px; }
.area-row .descs .zh { font-size: 14px; line-height: 1.55; }
.area-row .descs .en { font-size: 13px; color: var(--color-neutral-700); line-height: 1.55; }
.area-row .arrow { color: var(--color-accent); font-weight: 700; }

.pubs-all { padding: 0 var(--pad) 64px; }
.pubs-all > h2 { margin: 0 0 24px; font-size: 24px; font-weight: 800; }
.yeargroup { display: flex; flex-direction: column; padding-bottom: 24px; }
.yeargroup .ylabel {
  font-size: 12px; font-weight: 700; letter-spacing: .14em;
  color: var(--color-neutral-600); padding-bottom: 8px;
}
.pub-row {
  padding: 16px 8px; border-top: 1px solid var(--color-neutral-300);
  display: grid; grid-template-columns: 1fr 260px; gap: 24px; align-items: baseline;
}
.pub-row .bd { display: flex; flex-direction: column; gap: 4px; }
.pub-row .t { font-size: 17px; font-weight: 700; line-height: 1.4; }
.pub-row .a { font-size: 13px; color: var(--color-neutral-700); }
.pub-row .meta { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.pub-row .meta .v { font-size: 13px; font-weight: 600; }
.pub-row .meta .tag { white-space: nowrap; }

/* ── area detail ────────────────────────────────────────────────────────── */
.area-hero { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 2px solid var(--color-text); }
.area-hero-copy {
  padding: 56px var(--pad); display: flex; flex-direction: column; gap: 20px;
  border-right: 2px solid var(--color-text); justify-content: center;
}
.area-hero-copy .num { font-size: 13px; font-weight: 700; color: var(--color-accent); }
.area-hero-copy h1 { margin: 0; font-size: 44px; line-height: 1.08; font-weight: 800; }
.area-hero-copy .en-name { margin: 0; font-size: 18px; color: var(--color-neutral-800); }
.area-hero-copy .d-zh { margin: 0; font-size: 16px; line-height: 1.65; text-wrap: pretty; }
.area-hero-copy .d-en { margin: 0; font-size: 14px; line-height: 1.7; color: var(--color-neutral-800); text-wrap: pretty; }
.area-hero-media { min-height: 400px; }

.area-pubs { padding: 48px var(--pad) 64px; display: flex; flex-direction: column; gap: 20px; }
.area-pubs h2 { margin: 0; font-size: 22px; font-weight: 800; }
.area-pub-row {
  padding: 16px 8px; border-top: 1px solid var(--color-neutral-300);
  display: grid; grid-template-columns: 60px 1fr 200px; gap: 20px; align-items: baseline;
}
.area-pub-row .yr { font-size: 13px; color: var(--color-neutral-600); font-weight: 600; }
.area-pub-row .bd { display: flex; flex-direction: column; gap: 4px; }
.area-pub-row .t { font-size: 17px; font-weight: 700; line-height: 1.4; }
.area-pub-row .a { font-size: 13px; color: var(--color-neutral-800); line-height: 1.45; }
.area-pub-row .v { font-size: 13px; color: var(--color-neutral-700); }

/* ── publication detail ─────────────────────────────────────────────────── */
.pub-head {
  padding: 56px var(--pad) 40px; border-bottom: 2px solid var(--color-text);
  display: flex; flex-direction: column; gap: 18px;
}
.pub-head h1 { margin: 0; font-size: 44px; line-height: 1.1; font-weight: 800; max-width: 1000px; }
.pub-head .authors { margin: 0; font-size: 15px; color: var(--color-neutral-700); max-width: 1000px; }
.pub-teaser { border-bottom: 2px solid var(--color-text); background: var(--color-neutral-200); }
.pub-teaser img { width: 100%; max-height: 560px; object-fit: contain; margin: 0 auto; }

.pub-body { display: grid; grid-template-columns: 1.4fr 1fr; border-bottom: 2px solid var(--color-text); }
.pub-abstract {
  padding: 48px var(--pad); border-right: 2px solid var(--color-divider);
  display: flex; flex-direction: column; gap: 24px;
}
.pub-abstract h2 { margin: 0; font-size: 18px; font-weight: 800; }
.pub-abstract .blk { display: flex; flex-direction: column; gap: 10px; }
.pub-abstract .zh { margin: 0; font-size: 16px; line-height: 1.7; text-wrap: pretty; }
.pub-abstract .en { margin: 0; font-size: 14px; line-height: 1.75; color: var(--color-neutral-800); text-wrap: pretty; }
.pub-aside { padding: 48px var(--pad); display: flex; flex-direction: column; gap: 16px; }
.pub-aside h2 { margin: 0; font-size: 18px; font-weight: 800; }
.citation {
  background: var(--color-neutral-100); border: 1px solid var(--color-neutral-300);
  padding: 18px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px; line-height: 1.7; color: var(--color-neutral-800); white-space: pre-wrap;
  word-break: break-word;
}
.figures { padding: 48px var(--pad) 64px; display: flex; flex-direction: column; gap: 20px; }
.figures h2 { margin: 0; font-size: 18px; font-weight: 800; }
.figure-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.figure-grid img { width: 100%; border: 1px solid var(--color-neutral-300); background: #fff; }

/* ── update ─────────────────────────────────────────────────────────────── */
.updates { padding: 40px var(--pad) 64px; display: flex; flex-direction: column; gap: 32px; }
.upd-row {
  display: grid; grid-template-columns: 110px 90px 1fr; gap: 24px;
  padding: 20px 8px; border-top: 1px solid var(--color-neutral-300); align-items: baseline;
}
.upd-row .d { font-size: 13px; color: var(--color-neutral-600); font-weight: 600; }
.upd-row .tag { white-space: nowrap; justify-self: start; }
.upd-row .bd { display: flex; flex-direction: column; gap: 4px; }
.upd-row .t { font-size: 17px; line-height: 1.45; font-weight: 600; }
.upd-row .s { font-size: 14px; line-height: 1.5; color: var(--color-neutral-700); }

/* ── update detail (article body) ───────────────────────────────────────── */
.article { padding: 40px var(--pad) 64px; max-width: 860px; }
.article p { font-size: 16px; line-height: 1.85; margin: 0 0 18px; text-wrap: pretty; }
.article h3 {
  font-size: 20px; font-weight: 800; margin: 34px 0 14px;
  padding-bottom: 8px; border-bottom: 2px solid var(--color-divider);
}
.article ul { margin: 0 0 18px; padding-left: 22px; }
.article li { font-size: 16px; line-height: 1.8; margin-bottom: 6px; }
.article img {
  width: 100%; margin: 24px 0; border: 1px solid var(--color-neutral-300); background: #fff;
}
.article video { width: 100%; margin: 24px 0; background: #000; }

/* ── people ─────────────────────────────────────────────────────────────── */
.people { padding: 40px var(--pad) 64px; display: flex; flex-direction: column; gap: 40px; }
.people-group { display: flex; flex-direction: column; gap: 20px; }
.people-group-head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px;
  border-bottom: 2px solid var(--color-text); padding-bottom: 12px;
}
.people-group-head h2 { margin: 0; font-size: 20px; font-weight: 800; }
.people-group-head .en { font-size: 13px; color: var(--color-neutral-700); white-space: nowrap; }
.people-group-head .count { margin-left: auto; font-size: 13px; color: var(--color-neutral-600); }
.people-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.person { display: flex; flex-direction: column; gap: 10px; }
.person .media { aspect-ratio: 1 / 1; }
.person-txt { display: flex; flex-direction: column; gap: 3px; }
.person-txt .n { font-size: 17px; font-weight: 700; }
.person-txt .ne { font-size: 13px; color: var(--color-neutral-700); }
.person-txt .r { font-size: 13px; color: var(--color-neutral-800); padding-top: 4px; }
.person-txt .f { font-size: 13px; line-height: 1.5; }
.person-txt .e { font-size: 12px; color: var(--color-accent-700); word-break: break-all; }

/* alumni are listed more compactly — smaller portraits */
.people-grid.is-compact { grid-template-columns: repeat(6, 1fr); gap: 20px; }
.people-grid.is-compact .person-txt .n { font-size: 15px; }

/* ── person detail ──────────────────────────────────────────────────────── */
.person-hero {
  display: grid; grid-template-columns: 320px 1fr; gap: 40px;
  padding: 48px var(--pad); border-bottom: 2px solid var(--color-text);
  align-items: start;
}
.person-hero-media { aspect-ratio: 1 / 1; width: 100%; }
.person-info { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.person-info h1 { margin: 0; font-size: 40px; line-height: 1.08; font-weight: 800; }
.person-info .ne { margin: 0; font-size: 19px; color: var(--color-neutral-800); }
.person-meta { display: flex; flex-direction: column; gap: 10px; padding-top: 6px; }
.person-meta .row { display: grid; grid-template-columns: 92px 1fr; gap: 14px; align-items: baseline; }
.person-meta .k { font-size: 12px; font-weight: 700; letter-spacing: .08em; color: var(--color-neutral-600); text-transform: uppercase; }
.person-meta .v { font-size: 15px; line-height: 1.6; word-break: break-word; }

.person-pubs { padding: 48px var(--pad) 64px; display: flex; flex-direction: column; gap: 20px; }
.person-pubs h2 { margin: 0; font-size: 22px; font-weight: 800; }

/* ── admin passphrase gate ──────────────────────────────────────────────── */
.gate { flex: 1; display: flex; align-items: center; justify-content: center; padding: 64px var(--pad); }
.gate-box {
  width: min(400px, 100%); display: flex; flex-direction: column; gap: 14px;
  padding: 36px 32px; background: var(--color-neutral-100);
  border: 2px solid var(--color-text);
}
.gate-box h1 { margin: 0; font-size: 26px; font-weight: 800; }
.gate-box .sub-en {
  margin: 0 0 6px; font-size: 12px; letter-spacing: .06em;
  text-transform: uppercase; color: var(--color-neutral-600);
}
.gate-field { display: flex; flex-direction: column; gap: 6px; }
.gate-field > span { font-size: 12px; font-weight: 600; color: var(--color-neutral-800); }
.gate-err { margin: 0; font-size: 13px; font-weight: 600; color: var(--color-accent-700); }
.gate-mode { margin: 0; font-size: 12px; color: var(--color-neutral-600); }
.gate-back { font-size: 12px; color: var(--color-neutral-700); text-align: center; padding-top: 4px; }

/* mode badge + image field controls */
.admin-mode {
  font-size: 11px; font-weight: 700; letter-spacing: .06em;
  padding: 3px 10px; background: var(--color-neutral-200); color: var(--color-neutral-700);
}
.admin-mode.is-live { background: var(--color-accent-100); color: var(--color-accent-800); }

.field-thumb { margin-top: 2px; }
.field-thumb img {
  max-height: 120px; max-width: 100%; border: 1px solid var(--color-neutral-300); background: #fff;
}
.field-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 2px; }
.field-note { font-size: 12px; color: var(--color-neutral-700); }

/* ── admin ──────────────────────────────────────────────────────────────── */
.admin { display: flex; flex-direction: column; flex: 1; }
.admin-bar {
  padding: 16px var(--pad); border-bottom: 2px solid var(--color-text);
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px;
  background: var(--color-neutral-100);
}
.admin-bar .ttl { font-weight: 800; font-size: 15px; }
.admin-tabs { display: flex; gap: 4px; }
.admin-tab {
  padding: 8px 14px; font-size: 13px; font-weight: 600; border: 0; cursor: pointer;
  font-family: inherit; white-space: nowrap; background: transparent; color: var(--color-text);
}
.admin-tab.is-active { background: var(--color-text); color: #fff; }
.admin-status { margin-left: auto; font-size: 12px; color: var(--color-neutral-700); }

.admin-body { display: grid; grid-template-columns: 340px 1fr; flex: 1; min-height: 620px; }
.admin-list { border-right: 2px solid var(--color-text); display: flex; flex-direction: column; min-height: 0; }
.admin-list-top { padding: 12px 16px; border-bottom: 2px solid var(--color-divider); }
.admin-list-scroll { overflow: auto; flex: 1; }
.admin-row {
  display: flex; flex-direction: column; gap: 4px; text-align: left; width: 100%;
  padding: 14px 16px; border: 0; border-bottom: 1px solid var(--color-neutral-300);
  cursor: pointer; font-family: inherit; background: transparent;
  border-left: 3px solid transparent;
}
.admin-row:hover { background: var(--color-neutral-100); }
.admin-row.is-active { background: var(--color-accent-100); border-left-color: var(--color-accent); }
.admin-row .meta { font-size: 11px; color: var(--color-neutral-600); font-weight: 600; }
.admin-row .title { font-size: 14px; font-weight: 600; line-height: 1.35; }
.admin-row .sub { font-size: 12px; color: var(--color-neutral-700); line-height: 1.35; }

.admin-edit { display: flex; flex-direction: column; min-width: 0; }
.admin-fields {
  padding: 24px 28px; display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
  border-bottom: 2px solid var(--color-divider);
}
.admin-field { display: flex; flex-direction: column; gap: 6px; }
.admin-field.is-wide { grid-column: span 2; }
.admin-field > span { font-size: 12px; font-weight: 600; color: var(--color-neutral-800); }
.admin-preview {
  padding: 20px 28px; display: flex; flex-direction: column; gap: 12px;
  border-bottom: 2px solid var(--color-divider);
}
.admin-preview .lbl {
  font-size: 11px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--color-neutral-600); font-weight: 700;
}
.admin-preview .box {
  background: var(--color-neutral-100); border: 1px solid var(--color-neutral-300);
  padding: 18px 20px; display: flex; flex-direction: column; gap: 6px;
}
.admin-preview .box .t { font-size: 17px; font-weight: 700; line-height: 1.35; }
.admin-preview .box .s { font-size: 14px; color: var(--color-neutral-800); line-height: 1.45; }
.admin-preview .box .m { font-size: 13px; color: var(--color-neutral-700); }
/* Pinned to the bottom of the edit pane: the form is far taller than the
   viewport, and a delete button you have to scroll 1700px to reach reads as
   a delete button that does not exist. */
.admin-foot {
  margin-top: auto; padding: 14px 28px; display: flex; gap: 12px;
  align-items: center; flex-wrap: wrap;
  position: sticky; bottom: 0; z-index: 5;
  background: var(--color-bg); border-top: 2px solid var(--color-text);
}
.admin-foot .note { margin-left: auto; font-size: 12px; color: var(--color-neutral-700); }
.admin-empty { padding: 48px 28px; color: var(--color-neutral-700); }

/* ── footer ─────────────────────────────────────────────────────────────── */
.site-foot { margin-top: auto; }
.foot-inner {
  padding: 22px var(--pad); display: flex; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--color-neutral-700);
  border-top: 2px solid var(--color-divider);
}

/* ══════════════════════════════════════════════════════════════════════════
   Stage 2 — tablet (768–1024px)
   Columns thin out but the two-up structure survives; still no hamburger.
   ══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  :root { --pad: 28px; }

  .hero-copy { padding: 44px var(--pad); }
  .hero-copy h1 { font-size: 36px; }
  .hero-media { min-height: 340px; }
  .page-head { padding: 48px var(--pad) 32px; }
  .page-head h1 { font-size: 42px; }
  .mission .zh { font-size: 19px; }

  .area-grid { grid-template-columns: repeat(2, 1fr); }
  .area-cell:not(:nth-child(3n)) { border-right: 0; }
  .area-cell:not(:nth-child(2n)) { border-right: 2px solid var(--color-divider); }

  .area-row { grid-template-columns: 40px 160px 1fr 24px; row-gap: 12px; }
  .area-row .descs { grid-column: 2 / 4; }

  .pub-row { grid-template-columns: 1fr 200px; }
  .area-pub-row { grid-template-columns: 52px 1fr 160px; }

  .people-grid { grid-template-columns: repeat(3, 1fr); }
  .people-grid.is-compact { grid-template-columns: repeat(4, 1fr); }

  .person-hero { grid-template-columns: 260px 1fr; }

  .admin-body { grid-template-columns: 280px 1fr; }
  .admin-fields { padding: 20px var(--pad); }
}

/* ══════════════════════════════════════════════════════════════════════════
   Stage 3 — mobile (<=767px)
   Everything collapses to one column; nav becomes a disclosure menu.
   ══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 767px) {
  :root { --pad: 20px; }

  .site-head { flex-wrap: wrap; padding: 14px var(--pad); }
  .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 38px; height: 38px; border: 1px solid var(--color-divider);
    background: transparent; cursor: pointer; font-size: 18px; line-height: 1;
  }
  .site-nav {
    display: none; order: 3; width: 100%; justify-content: flex-start;
    flex-direction: column; align-items: stretch; gap: 0; padding-top: 8px;
  }
  .site-nav.is-open { display: flex; }
  .site-nav .navl {
    padding: 12px 0; border-bottom: 1px solid var(--color-neutral-300);
    border-left: 3px solid transparent; padding-left: 10px; font-size: 15px;
  }
  .site-nav .navl.is-active { border-bottom-color: var(--color-neutral-300); border-left-color: var(--color-accent); }

  .hero, .mission, .home-split, .area-hero, .pub-body, .page-head .lede { grid-template-columns: 1fr; }
  .hero-copy, .area-hero-copy { border-right: 0; border-bottom: 2px solid var(--color-text); padding: 40px var(--pad); }
  .hero-copy h1 { font-size: 34px; }
  .hero-media { min-height: 260px; }
  .area-hero-media { min-height: 240px; }
  .mission { gap: 20px; }
  .mission .zh { font-size: 18px; }
  .home-col:first-child { border-right: 0; border-bottom: 2px solid var(--color-divider); }
  .page-head { padding: 40px var(--pad) 28px; }
  .page-head h1 { font-size: 34px; }
  .page-head .lede { gap: 16px; }

  .area-grid { grid-template-columns: 1fr; margin: 16px var(--pad) 32px; }
  .area-cell:not(:nth-child(3n)),
  .area-cell:not(:nth-child(2n)) { border-right: 0; }

  .area-row { grid-template-columns: 1fr; gap: 12px; }
  .area-row .media { height: 180px; }
  .area-row .descs { grid-column: auto; }
  .area-row .arrow { display: none; }

  .pub-row { grid-template-columns: 1fr; gap: 10px; }
  .pub-row .meta { flex-direction: row; align-items: center; gap: 10px; flex-wrap: wrap; }
  .area-pub-row { grid-template-columns: 1fr; gap: 6px; }

  .pub-head { padding: 36px var(--pad) 28px; }
  .pub-head h1 { font-size: 28px; }
  .pub-abstract { border-right: 0; border-bottom: 2px solid var(--color-divider); padding: 32px var(--pad); }
  .pub-aside { padding: 32px var(--pad); }
  .figure-grid { grid-template-columns: 1fr; }

  .upd-row { grid-template-columns: 1fr; gap: 8px; }
  .upd-row .tag { justify-self: start; }

  .people-grid, .people-grid.is-compact { grid-template-columns: repeat(2, 1fr); }

  .person-hero { grid-template-columns: 1fr; }
  .person-hero-media { max-width: 240px; }

  .admin-body { grid-template-columns: 1fr; }
  .admin-list { border-right: 0; border-bottom: 2px solid var(--color-text); max-height: 320px; }
  .admin-fields { grid-template-columns: 1fr; padding: 20px var(--pad); }
  .admin-field.is-wide { grid-column: auto; }
  .admin-preview, .admin-foot { padding-inline: var(--pad); }

  .foot-inner { flex-direction: column; gap: 8px; }
}

@media (max-width: 480px) {
  .people-grid, .people-grid.is-compact { grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-copy h1 { font-size: 28px; }
  .page-head h1 { font-size: 30px; }
}

@media print {
  .site-head, .site-nav, .btnrow, .backbar { display: none; }
}