:root {
  --paper: #faf8f4;
  --tint: #f2eee6;
  --ink: #17160f;
  --ink-2: #4a463c;
  --ink-3: #8a8478;
  --rule: #dcd6ca;
  --accent: #a32b1e;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration-color: var(--rule); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- masthead ---------- */

.masthead {
  padding: 56px 0 34px;
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 26px;
}

.wordmark {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
}

.wordmark .slash { color: var(--accent); margin: 0 2px; }

.assess-link {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
}

.assess-link:hover { color: var(--ink); border-bottom-color: var(--accent); }

.brand-sub {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.thesis {
  font-family: var(--serif);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.35;
  max-width: 22em;
  margin: 0 0 18px;
  letter-spacing: 0.01em;
}

.count {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  margin: 0;
}

/* ---------- controls ---------- */

.controls {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 248, 244, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.controls-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding-top: 14px;
  padding-bottom: 14px;
}

#q {
  flex: 1 1 220px;
  min-width: 180px;
  border: 0;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  padding: 7px 2px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
  outline: none;
}

#q::placeholder { color: var(--ink-3); }
#q:focus { border-bottom-color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }

.chip {
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 12px;
  padding: 5px 11px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.chip:hover { border-color: var(--ink-3); color: var(--ink); }

.chip.is-on {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

/* ---------- grid ---------- */

main { padding: 40px 0 72px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(318px, 1fr));
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
  background: var(--paper);
}

.card {
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 22px 24px 18px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  min-height: 210px;
  transition: background 0.15s;
  text-align: left;
  font: inherit;
  color: inherit;
  background: transparent;
  appearance: none;
}

.card:hover, .card:focus-visible { background: var(--tint); outline: none; }
.card:focus-visible { box-shadow: inset 0 0 0 2px var(--accent); }

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.id {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--ink-3);
}

.tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.tag.domain-physical-ai { color: var(--accent); }
.tag.domain-longevity { color: #4a6b4e; }

.card h3 {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.4;
  font-weight: 600;
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}

.pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 12px;
}

.pair .side {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-2);
}

.pair .side b {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: var(--ink-3);
  margin-bottom: 4px;
}

.pair .arrow {
  font-family: var(--serif);
  color: var(--ink-3);
  font-size: 15px;
  padding-top: 14px;
}

.card-gap {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0 0 14px;
  flex: 1;
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.grade {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.grade::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-3);
}

.grade.A::before { background: #4a6b4e; }
.grade.B::before { background: #b58a2b; }
.grade.C::before { background: var(--accent); }

.empty {
  font-family: var(--serif);
  font-size: 18px;
  color: var(--ink-3);
  padding: 40px 0;
}

/* ---------- detail ---------- */

.detail { position: fixed; inset: 0; z-index: 60; }

.detail-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(23, 22, 15, 0.32);
}

.detail-panel {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: min(560px, 100%);
  background: var(--paper);
  border-left: 1px solid var(--rule);
  overflow-y: auto;
  padding: 44px 40px 64px;
  animation: slide-in 0.22s ease-out;
}

@keyframes slide-in {
  from { transform: translateX(24px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.detail-close {
  position: absolute;
  top: 14px;
  right: 18px;
  border: 0;
  background: none;
  font-size: 26px;
  line-height: 1;
  color: var(--ink-3);
  cursor: pointer;
  padding: 6px;
}

.detail-close:hover { color: var(--ink); }

.detail-panel h2 {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.35;
  font-weight: 600;
  margin: 6px 0 8px;
}

.detail-meta {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  text-transform: uppercase;
  margin-bottom: 26px;
}

.field {
  padding: 16px 0;
  border-top: 1px solid var(--rule);
}

.field dt {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
}

.field dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
}

.field dd.lead { font-family: var(--serif); font-size: 17px; line-height: 1.6; }

.src-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.src-list li {
  display: grid;
  grid-template-columns: minmax(64px, auto) 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  border-top: 1px solid var(--rule);
}

.src-list li:first-child { border-top: 0; padding-top: 0; }

.src-org {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

.src-ref { font-size: 13.5px; line-height: 1.5; }

.src-kind {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  white-space: nowrap;
}

/* ---------- foot ---------- */

.foot {
  border-top: 1px solid var(--rule);
  padding: 28px 0 44px;
  font-size: 12px;
  color: var(--ink-3);
  line-height: 1.8;
}

.foot p { margin: 0; }
.foot strong { color: var(--ink-2); font-weight: 500; }

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .masthead { padding: 40px 0 26px; }
  .grid { grid-template-columns: 1fr; }
  .detail-panel { padding: 40px 24px 56px; }
  .controls-inner { gap: 8px 12px; }
  #q { flex-basis: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}