/* AVA — brutalist research lab
   off-white paper · ink-black type · single accent · hairline rules */

:root {
  /* base */
  --bg: #F5F4EE;
  --bg-rule: #0B0D0E;
  --fg: #0B0D0E;
  --muted: #6B6864;
  --faint: #B7B3AA;
  --paper: #FBFAF4;
  --hairline: rgba(11,13,14,.18);
  --hairline-strong: rgba(11,13,14,.42);
  --row-hover: rgba(11,13,14,.045);
  --accent: #C73A2C;            /* ink red, like research-paper marginalia */
  --accent-soft: rgba(199,58,44,.12);

  /* type */
  --mono: "IBM Plex Mono", ui-monospace, "Menlo", monospace;
  --sans: "IBM Plex Sans", "Inter", ui-sans-serif, system-ui, sans-serif;

  /* scale (comfortable) */
  --fs-base: 15px;
  --fs-small: 12.5px;
  --fs-tiny: 11px;
  --fs-h1: clamp(44px, 7.2vw, 92px);
  --fs-h2: 13px;
  --fs-h3: 22px;
  --lh-prose: 1.55;
  --gut: 32px;
  --pad-section: 88px;
}

:root[data-density="compact"] {
  --fs-base: 13.5px;
  --fs-small: 11.5px;
  --fs-tiny: 10.25px;
  --fs-h1: clamp(40px, 6.6vw, 80px);
  --fs-h3: 19px;
  --lh-prose: 1.45;
  --gut: 22px;
  --pad-section: 64px;
}

:root[data-mode="dark"] {
  --bg: #0B0D0E;
  --paper: #0F1112;
  --fg: #EDEAE0;
  --muted: #8E8B85;
  --faint: #4B4842;
  --hairline: rgba(237,234,224,.20);
  --hairline-strong: rgba(237,234,224,.50);
  --row-hover: rgba(237,234,224,.05);
  --accent: #5BFFA1;            /* phosphor green */
  --accent-soft: rgba(91,255,161,.14);
}

:root[data-type="jetinter"] {
  --mono: "JetBrains Mono", ui-monospace, "Menlo", monospace;
  --sans: "Inter", ui-sans-serif, system-ui, sans-serif;
}
:root[data-type="berksohne"] {
  --mono: "Space Mono", ui-monospace, "Menlo", monospace;
  --sans: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: var(--fs-base);
  line-height: var(--lh-prose);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv01";
}

a { color: inherit; text-decoration: none; }
a.ink {
  border-bottom: 1px solid var(--hairline-strong);
  transition: border-color .12s, color .12s;
}
a.ink:hover { border-bottom-color: var(--accent); color: var(--accent); }

::selection { background: var(--accent); color: var(--bg); }

/* layout */
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 40px; }
.wrap-narrow { max-width: 920px; margin: 0 auto; padding: 0 40px; }

@media (max-width: 720px) {
  .wrap, .wrap-narrow { padding: 0 22px; }
}

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 44px;
}
.topbar .brand {
  display: flex; align-items: center; gap: 12px;
}
.topbar .brand-mark {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--fg); text-decoration: none;
}
.topbar .brand-mark img {
  display: block; width: 24px; height: 24px;
  border-radius: 4px;
}
.topbar .brand b { letter-spacing: .12em; }
.topbar .brand .ver { color: var(--muted); }
[data-mode="light"] .topbar .brand-mark img { filter: invert(1); }
.topbar nav {
  display: flex; gap: 22px;
}
.topbar nav a { color: var(--muted); }
.topbar nav a:hover { color: var(--fg); }
.topbar .ext { color: var(--fg); }

/* ascii dividers */
.ascii-rule {
  font-family: var(--mono);
  color: var(--faint);
  font-size: var(--fs-tiny);
  letter-spacing: 0;
  white-space: pre;
  overflow: hidden;
  user-select: none;
  padding: 0;
  line-height: 1;
}
.ascii-rule::before {
  content: "──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────";
  display: block;
}
.ascii-band {
  font-family: var(--mono);
  color: var(--faint);
  font-size: var(--fs-tiny);
  letter-spacing: 0;
  white-space: pre;
  line-height: 1.1;
}

/* section header (ALL CAPS, ASCII bracket) */
.section-head {
  display: flex; align-items: baseline; gap: 14px;
  font-family: var(--mono);
  font-size: var(--fs-h2);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: var(--pad-section);
  padding-bottom: 22px;
}
.section-head .num { color: var(--fg); }
.section-head .title { color: var(--fg); font-weight: 600; }
.section-head .filler {
  flex: 1;
  border-bottom: 1px dashed var(--hairline);
  transform: translateY(-3px);
}

/* hero */
.hero {
  padding-top: 88px;
  padding-bottom: 56px;
}
.hero-meta {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--muted);
  display: flex; gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.hero-meta b { color: var(--fg); font-weight: 500; }
.hero h1 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: var(--fs-h1);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0 0 28px;
  text-wrap: balance;
}
.hero h1 .accent { color: var(--accent); }
.hero h1 .caret {
  display: inline-block;
  width: .58ch;
  background: var(--fg);
  margin-left: 2px;
  animation: blink 1.06s steps(2, jump-none) infinite;
  transform: translateY(-.05em);
}
:root[data-mode="dark"] .hero h1 .caret { background: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

.hero-sub {
  font-family: var(--sans);
  font-size: 19px;
  line-height: 1.45;
  color: var(--muted);
  max-width: 720px;
  margin: 0 0 36px;
  text-wrap: pretty;
}
.hero-sub b { color: var(--fg); font-weight: 500; }

.hero-ctas {
  display: flex; flex-wrap: wrap; gap: 12px;
  margin-bottom: 56px;
}

.btn {
  appearance: none; cursor: pointer;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .12em;
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  padding: 13px 18px;
  display: inline-flex; align-items: center; gap: 10px;
  transition: background .12s, color .12s, transform .12s;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--bg); }
:root[data-mode="dark"] .btn { color: var(--bg); }
:root[data-mode="dark"] .btn:hover { color: var(--bg); }

.btn.outline { background: transparent; color: var(--fg); }
.btn.outline:hover { background: var(--fg); color: var(--bg); }
.btn .arrow {
  display: inline-block;
  transition: transform .12s;
}
.btn:hover .arrow { transform: translateX(3px); }

/* hero training-summary frame */
.frame {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  line-height: 1.45;
  color: var(--muted);
  border: 1px solid var(--hairline);
  margin-top: 12px;
  position: relative;
}
.frame-cap {
  position: absolute;
  top: -8px; left: 18px;
  background: var(--bg);
  padding: 0 10px;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--muted);
}
.frame-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 22px 26px 24px;
  gap: 6px 36px;
}
.frame-row {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: baseline;
  gap: 14px;
  border-bottom: 1px dashed var(--hairline);
  padding: 5px 0;
}
.frame-row:nth-last-child(-n+2) { border-bottom: 0; }
.frame-row .k { color: var(--muted); text-transform: lowercase; letter-spacing: .04em; }
.frame-row .v { color: var(--fg); font-variant-numeric: tabular-nums; }
.frame-row .v.accent { color: var(--accent); }
@media (max-width: 720px) {
  .frame-grid { grid-template-columns: 1fr; gap: 4px; }
  .frame-row:nth-last-child(-n+2) { border-bottom: 1px dashed var(--hairline); }
  .frame-row:last-child { border-bottom: 0; }
}

/* hero stat grid (always-visible numbers band) */
.stat-band {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--fg);
  border-bottom: 1px solid var(--fg);
  margin-top: 0;
}
.stat-band > div {
  padding: 22px 18px 18px;
  border-right: 1px solid var(--hairline);
}
.stat-band > div:last-child { border-right: 0; }
.stat-band .label {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  margin-bottom: 8px;
  display: block;
}
.stat-band .num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
}
.stat-band .num small {
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
  margin-left: 4px;
}
@media (max-width: 880px) {
  .stat-band { grid-template-columns: repeat(2, 1fr); }
  .stat-band > div { border-bottom: 1px solid var(--hairline); }
  .stat-band > div:nth-child(2n) { border-right: 0; }
}

/* the constraint — side-by-side cards */
.constraint-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--hairline);
}
.constraint-grid > div {
  padding: 28px 28px 32px;
  font-family: var(--mono);
  font-size: var(--fs-small);
  line-height: 1.55;
}
.constraint-grid > div:first-child {
  border-right: 1px solid var(--hairline);
  color: var(--muted);
  background: var(--paper);
}
.constraint-grid .lbl {
  text-transform: uppercase;
  letter-spacing: .12em;
  font-size: var(--fs-tiny);
  margin-bottom: 14px;
  color: var(--muted);
}
.constraint-grid .lbl::before { content: "// "; opacity: .55; }
.constraint-grid h3 {
  margin: 0 0 18px;
  font-size: 22px;
  font-weight: 500;
  color: var(--fg);
  letter-spacing: -.005em;
}
.constraint-grid > div:last-child h3 { color: var(--accent); }
.constraint-grid ul {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 6px;
}
.constraint-grid li {
  display: flex; justify-content: space-between; gap: 16px;
  border-bottom: 1px dashed var(--hairline);
  padding: 6px 0;
  font-variant-numeric: tabular-nums;
}
.constraint-grid li:last-child { border-bottom: 0; }
.constraint-grid li b { font-weight: 500; color: var(--fg); }

@media (max-width: 760px) {
  .constraint-grid { grid-template-columns: 1fr; }
  .constraint-grid > div:first-child { border-right: 0; border-bottom: 1px solid var(--hairline); }
}

/* paragraph */
.para {
  font-size: 18px;
  line-height: 1.55;
  color: var(--fg);
  max-width: 720px;
  margin: 0 0 32px;
  text-wrap: pretty;
}
.para b { font-weight: 600; }

/* benchmark comparison chart (ARC-C horizontal bars) */
.cmp-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
@media (max-width: 980px) { .cmp-block { grid-template-columns: 1fr; } }

.cmp-title {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  margin-bottom: 14px;
  display: flex; gap: 10px; align-items: baseline;
}
.cmp-title b { color: var(--fg); font-weight: 500; }
.cmp-title .n { color: var(--faint); margin-left: auto; }

.bar-row {
  display: grid;
  grid-template-columns: 200px 1fr 60px;
  align-items: center;
  gap: 14px;
  padding: 5px 0;
  font-family: var(--mono);
  font-size: var(--fs-small);
  border-bottom: 1px dashed var(--hairline);
}
.bar-row:last-child { border-bottom: 0; }
.bar-row .lbl { color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar-row.is-ava .lbl { color: var(--accent); font-weight: 500; }
.bar-row .bar {
  height: 14px;
  position: relative;
  background: transparent;
  border-left: 1px solid var(--hairline);
}
.bar-row .bar::before {
  content: "";
  position: absolute; inset: 0 auto 0 0;
  background: var(--fg);
  width: 0;
  transition: width 1.1s cubic-bezier(.2,.7,.1,1);
}
.bar-row.is-ava .bar::before { background: var(--accent); }
.bar-row .val {
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--fg);
}
.bar-row.is-ava .val { color: var(--accent); font-weight: 500; }

.cmp-block.revealed .bar-row .bar::before { width: var(--w, 0%); }

/* benchmark table */
.bm-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
}
.bm-toolbar .seg {
  display: inline-flex;
  border: 1px solid var(--hairline);
}
.bm-toolbar .seg button {
  appearance: none; background: transparent; cursor: pointer;
  font: inherit; color: var(--muted);
  padding: 7px 12px;
  border: 0;
  border-right: 1px solid var(--hairline);
}
.bm-toolbar .seg button:last-child { border-right: 0; }
.bm-toolbar .seg button[aria-pressed="true"] {
  background: var(--fg); color: var(--bg);
}
.bm-toolbar .seg button:hover:not([aria-pressed="true"]) { color: var(--fg); }
.bm-toolbar .meta { margin-left: auto; color: var(--faint); }

.bm-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: var(--fs-small);
  font-variant-numeric: tabular-nums;
}
.bm-table thead th {
  text-align: left;
  padding: 10px 14px;
  font-weight: 500;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  border-bottom: 2px solid var(--fg);
  border-top: 2px solid var(--fg);
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  background: var(--bg);
}
.bm-table thead th .arr {
  display: inline-block; width: .8ch; color: var(--faint); margin-left: 4px;
}
.bm-table thead th[aria-sort="ascending"] .arr,
.bm-table thead th[aria-sort="descending"] .arr { color: var(--accent); }
.bm-table tbody td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--hairline);
  vertical-align: middle;
}
.bm-table tbody tr:hover td { background: var(--row-hover); }
.bm-table tbody tr:hover td:first-child { color: var(--accent); }
.bm-table .col-bar {
  width: 220px;
}
.bm-table .col-bar .mini {
  height: 8px;
  border-left: 1px solid var(--hairline-strong);
  position: relative;
}
.bm-table .col-bar .mini::before {
  content: "";
  position: absolute; inset: 0 auto 0 0;
  background: var(--fg);
  width: var(--w, 0%);
  transition: width .8s cubic-bezier(.2,.7,.1,1);
  transition-delay: var(--d, 0ms);
}
.bm-table tbody tr:hover .mini::before { background: var(--accent); }
.bm-table .col-acc { font-weight: 500; }
.bm-table .col-cat {
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  white-space: nowrap;
}
.bm-table .col-ci { color: var(--muted); white-space: nowrap; }
.bm-table .col-name { white-space: nowrap; }
.bm-table .star { color: var(--accent); margin-right: 4px; }

@media (max-width: 760px) {
  .bm-table .col-cat, .bm-table .col-ci, .bm-table .col-bar { display: none; }
  .bm-table thead th.is-mobile-hidden { display: none; }
}

/* how it works cards */
.how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}
.how-card {
  padding: 28px 28px 32px;
  border-right: 1px solid var(--hairline);
  display: flex; flex-direction: column;
  gap: 12px;
}
.how-card:last-child { border-right: 0; }
.how-card .num {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  letter-spacing: .14em;
  color: var(--accent);
  text-transform: uppercase;
}
.how-card h3 {
  margin: 0;
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -.005em;
}
.how-card p {
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-small);
  line-height: 1.55;
}
.how-card .pin {
  margin-top: auto;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--fg);
  border-top: 1px dashed var(--hairline);
  padding-top: 12px;
  display: flex; justify-content: space-between;
}
.how-card .pin b { color: var(--accent); font-weight: 500; }
@media (max-width: 880px) {
  .how-grid { grid-template-columns: 1fr; }
  .how-card { border-right: 0; border-bottom: 1px solid var(--hairline); }
  .how-card:last-child { border-bottom: 0; }
}

/* code block */
.code {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--paper);
  border: 1px solid var(--hairline);
  position: relative;
  overflow: hidden;
  margin: 0;
}
.code-head {
  display: flex; align-items: center;
  border-bottom: 1px solid var(--hairline);
  padding: 8px 14px 8px 18px;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
}
.code-head .file { color: var(--fg); }
.code-head .right {
  margin-left: auto;
  display: flex; gap: 8px;
}
.copy-btn {
  appearance: none; background: transparent; cursor: pointer;
  border: 1px solid var(--hairline);
  font: inherit; font-size: var(--fs-tiny);
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted);
  padding: 5px 10px;
}
.copy-btn:hover { color: var(--fg); border-color: var(--fg); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent); }
.code pre {
  margin: 0;
  padding: 18px 18px 20px;
  overflow-x: auto;
  white-space: pre;
}
.code .kw { color: var(--accent); }
.code .str { color: var(--fg); font-weight: 500; }
.code .num { color: var(--fg); }
.code .com { color: var(--faint); }
.code .fn { color: var(--fg); font-weight: 500; }

:root[data-mode="dark"] .code .kw { color: var(--accent); }
:root[data-mode="dark"] .code .str { color: #FFD17A; }

/* try-it tabs */
.try-block {
  border: 1px solid var(--hairline);
}
.try-tabs {
  display: flex;
  border-bottom: 1px solid var(--hairline);
  background: var(--paper);
}
.try-tabs button {
  appearance: none; cursor: pointer;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--hairline);
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  padding: 14px 22px;
  position: relative;
}
.try-tabs button:hover { color: var(--fg); }
.try-tabs button[aria-pressed="true"] {
  color: var(--fg);
}
.try-tabs button[aria-pressed="true"]::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--accent);
}
.try-tabs .meta {
  margin-left: auto;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  padding: 14px 18px;
  display: flex; gap: 22px; align-items: center;
}
.try-tabs .meta b { color: var(--fg); font-weight: 500; }
.try-pane { display: none; }
.try-pane[data-active] { display: block; }
.try-pane .code {
  border: 0;
}

/* limits list */
.limits {
  border-top: 1px solid var(--fg);
  border-bottom: 1px solid var(--fg);
}
.limit-row {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: 28px;
  align-items: baseline;
  padding: 18px 0;
  border-bottom: 1px dashed var(--hairline);
}
.limit-row:last-child { border-bottom: 0; }
.limit-row .tag {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
}
.limit-row .body { font-size: 16px; line-height: 1.5; color: var(--fg); }
.limit-row .body b { font-weight: 600; }
.limit-row .num {
  font-family: var(--mono);
  font-size: var(--fs-small);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
@media (max-width: 760px) {
  .limit-row { grid-template-columns: 1fr; gap: 6px; }
  .limit-row .num { display: none; }
}

/* roadmap */
.roadmap-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin-bottom: 36px;
}
@media (max-width: 880px) { .roadmap-intro { grid-template-columns: 1fr; } }

.roadmap-intro h3 {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -.005em;
}
.roadmap-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.chev-row {
  display: flex; flex-wrap: wrap;
  border: 1px solid var(--hairline);
  overflow: hidden;
}
.chev {
  flex: 1;
  min-width: 100px;
  cursor: pointer;
  position: relative;
  padding: 16px 18px 16px 22px;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--muted);
  border-right: 1px solid var(--hairline);
  transition: background .12s, color .12s;
  user-select: none;
}
.chev:last-child { border-right: 0; }
.chev .id { color: var(--fg); font-weight: 500; display: block; margin-bottom: 4px; font-size: 13px; }
.chev.is-done { background: var(--paper); color: var(--muted); }
.chev.is-done .id::after { content: " ✓"; color: var(--accent); }
.chev.is-active {
  background: var(--fg); color: var(--bg);
}
.chev.is-active .id { color: var(--accent); }
.chev:hover:not(.is-active) { background: var(--row-hover); color: var(--fg); }

.chev-detail {
  border: 1px solid var(--hairline);
  border-top: 0;
  padding: 24px 28px 28px;
  background: var(--paper);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 28px;
}
.chev-detail .meta {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
}
.chev-detail .meta b { color: var(--fg); display: block; margin-bottom: 6px; font-weight: 500; }
.chev-detail h4 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 18px;
  font-weight: 500;
}
.chev-detail p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}
@media (max-width: 760px) {
  .chev-detail { grid-template-columns: 1fr; }
}

/* research links */
.link-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}
.link-card {
  padding: 26px 24px 28px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  display: flex; flex-direction: column;
  gap: 14px;
  cursor: pointer;
  transition: background .12s;
  position: relative;
}
.link-card:hover { background: var(--paper); }
.link-card:hover h4 { color: var(--accent); }
.link-card:nth-child(3n) { border-right: 0; }
.link-card:nth-last-child(-n+1):nth-child(3n+1),
.link-card:nth-last-child(-n+2):nth-child(3n+1),
.link-card:nth-last-child(-n+2):nth-child(3n+2),
.link-card:last-child { /* no-op safety */ }

.link-card .kicker {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
}
.link-card h4 {
  margin: 0;
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -.005em;
  transition: color .12s;
}
.link-card p {
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-small);
  line-height: 1.55;
}
.link-card .arr {
  margin-top: auto;
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--fg);
  display: flex; gap: 8px; align-items: center;
}
.link-card .arr::after {
  content: "→";
  display: inline-block;
  transition: transform .12s;
}
.link-card:hover .arr::after { transform: translateX(4px); }
.link-card:hover .arr { color: var(--accent); }
@media (max-width: 880px) {
  .link-grid { grid-template-columns: 1fr; }
  .link-card { border-right: 0; }
}

/* footer */
footer {
  margin-top: 88px;
  border-top: 1px solid var(--fg);
  padding: 36px 0 56px;
  font-family: var(--mono);
  font-size: var(--fs-small);
}
footer .grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 36px;
}
footer .grid h5 {
  margin: 0 0 8px;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  font-weight: 500;
}
footer .grid p, footer .grid a {
  color: var(--fg);
  display: block;
}
footer .grid a { color: var(--muted); margin-bottom: 4px; }
footer .grid a:hover { color: var(--accent); }
footer .citation {
  border: 1px solid var(--hairline);
  background: var(--paper);
}
footer .citation pre {
  margin: 0;
  padding: 18px;
  font-size: var(--fs-tiny);
  white-space: pre;
  overflow-x: auto;
  color: var(--fg);
}
footer .colofon {
  display: flex; justify-content: space-between;
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  margin-top: 24px;
}
@media (max-width: 760px) {
  footer .grid { grid-template-columns: 1fr; }
}

/* code modal */
.modal-back {
  position: fixed; inset: 0;
  background: rgba(11,13,14,.55);
  z-index: 1000;
  display: none;
  align-items: flex-start; justify-content: center;
  padding: 6vh 24px;
  overflow-y: auto;
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}
.modal-back[data-open] { display: flex; }
.modal {
  width: 100%;
  max-width: 880px;
  background: var(--bg);
  border: 1px solid var(--fg);
  position: relative;
}
.modal-head {
  display: flex; align-items: baseline;
  padding: 16px 20px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  gap: 12px;
}
.modal-head b { color: var(--fg); font-weight: 500; }
.modal-head .x {
  margin-left: auto;
  appearance: none; background: transparent; border: 1px solid var(--hairline);
  font: inherit; font-size: var(--fs-tiny);
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted); cursor: pointer; padding: 6px 10px;
}
.modal-head .x:hover { color: var(--accent); border-color: var(--accent); }

/* training rig diagram */
.rig {
  font-family: var(--mono);
  font-size: var(--fs-tiny);
  line-height: 1.45;
  color: var(--muted);
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: 26px 28px 28px;
  position: relative;
}
.rig-cap {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: var(--fs-tiny);
  color: var(--fg);
  margin-bottom: 22px;
}
.rig-cap b { color: var(--accent); font-weight: 500; }
.rig-flow {
  display: grid;
  grid-template-columns: 1fr auto 2fr auto 1fr;
  align-items: stretch;
  gap: 10px;
}
.rig-box {
  border: 1px solid var(--hairline-strong);
  background: var(--bg);
  padding: 14px 16px 16px;
  display: flex; flex-direction: column;
  gap: 6px;
}
.rig-box .lbl {
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--muted);
  font-size: var(--fs-tiny);
  margin-bottom: 4px;
}
.rig-box .v {
  color: var(--fg);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-small);
}
.rig-box .v.accent { color: var(--accent); }
.rig-box ul {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 3px;
  color: var(--fg);
  font-size: var(--fs-tiny);
}
.rig-arrow {
  align-self: center;
  font-size: 14px;
  color: var(--muted);
  letter-spacing: 0;
}
.rig-foot {
  display: flex; justify-content: space-between; gap: 18px;
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px dashed var(--hairline);
  font-size: var(--fs-tiny);
  text-transform: uppercase;
  letter-spacing: .12em;
}
.rig-foot b { color: var(--fg); font-weight: 500; }
.rig-foot .accent { color: var(--accent); }
.rig-out {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  margin-top: 8px;
}
.rig-out span {
  border: 1px solid var(--hairline);
  padding: 4px 8px;
  font-size: var(--fs-tiny);
  color: var(--fg);
}
@media (max-width: 880px) {
  .rig-flow { grid-template-columns: 1fr; }
  .rig-arrow { transform: rotate(90deg); padding: 4px 0; }
}

/* tweaks toggle hint when first loaded — do not need; tweaks panel is starter */

/* utility */
.fade-in { opacity: 0; transform: translateY(6px); transition: opacity .6s, transform .6s; }
.fade-in.in { opacity: 1; transform: none; }

.kbd {
  font-family: var(--mono);
  font-size: 10.5px;
  border: 1px solid var(--hairline);
  padding: 1px 6px;
  border-radius: 2px;
  color: var(--muted);
}