/* ==========================================================================
   VDD — Signal Grid
   Swiss/editorial brutalist: black on white, one hot accent, exposed grid.
   ========================================================================== */

:root {
  --paper: #ffffff;
  --ink: #0a0a0a;
  --ink-70: #4a4a4a;
  --ink-45: #7d7d7d;
  --rule: #0a0a0a;
  --hair: #d8d8d8;
  --wash: #f2f2f0;
  --accent: #ff3b00;
  --accent-wash: #fff1ec;
  --pass: #0a7d3c;
  --fail: #ff3b00;
  --hold: #8a6a00;

  --bd: 2px solid var(--ink);
  --bd-hair: 1px solid var(--hair);

  --display: "Noto Sans SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --body: "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --wrap: 1240px;
  --read: 62ch;
  --gut: 2rem;
  --step: 1.5rem;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  margin: 0;
  letter-spacing: -0.035em;
  line-height: 1;
  text-wrap: balance;
}

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

a { color: var(--ink); text-decoration: none; }

ul, ol { margin: 0 0 1rem; padding-left: 1.2rem; }
li { margin-bottom: 0.45rem; }
li:last-child { margin-bottom: 0; }

strong { font-weight: 700; }
em { font-style: italic; }

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

/* ---------- utilities ------------------------------------------------- */

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gut); }
.read { max-width: var(--read); }
.mono { font-family: var(--mono); }
.u-accent { color: var(--accent); }
.u-muted { color: var(--ink-70); }
.u-mark { background: var(--accent); color: var(--paper); padding: 0 0.2em; }
.u-underline { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.u-caps {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.u-hide { display: none; }

/* hard-edged brutalist panel */
.panel { border: var(--bd); background: var(--paper); padding: 1.5rem; }
.panel--wash { background: var(--wash); }
.panel--ink { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.panel--offset { box-shadow: 8px 8px 0 var(--ink); }
.panel--offset-accent { box-shadow: 8px 8px 0 var(--accent); }

.grid { display: grid; gap: var(--step); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- progress + header ---------------------------------------- */

.progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  z-index: 90;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper);
  border-bottom: var(--bd);
}
.masthead-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
  height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.logo {
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: -0.05em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo b { background: var(--ink); color: var(--paper); padding: 0.1em 0.35em; }
.logo span { color: var(--ink-45); font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; font-weight: 500; }

.index { display: flex; align-items: center; gap: 1.4rem; }
.index-list { display: flex; gap: 1.1rem; list-style: none; margin: 0; padding: 0; }
.index-list a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-45);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}
.index-list a:hover { color: var(--ink); }
.index-list a.is-active { color: var(--ink); border-bottom-color: var(--accent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: var(--bd);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.7rem 1.1rem;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.btn--solid { background: var(--ink); color: var(--paper); }
.btn--solid:hover { box-shadow: 4px 4px 0 var(--accent); }
.btn--sm { padding: 0.5rem 0.8rem; font-size: 0.68rem; }

.nav-toggle { display: inline-flex; }

/* ---------- hero ------------------------------------------------------ */

.hero { padding: 4.5rem 0 0; }
.hero-eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border: var(--bd);
  padding: 0.3rem 0.6rem;
}
.tag--solid { background: var(--ink); color: var(--paper); }
.tag--accent { background: var(--accent); color: var(--paper); border-color: var(--accent); }

.hero h1 {
  font-size: clamp(2.1rem, 9.2vw, 8.2rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.055em;
  line-height: 0.88;
  margin-bottom: 1.75rem;
}
.hero h1 .line { display: block; }
.hero-sub {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(1.25rem, 2.6vw, 2rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  max-width: 34ch;
  margin: 0 0 2.5rem;
  padding-top: 1.5rem;
  border-top: var(--bd);
}
.hero-sub b { font-weight: 800; }

.hero-cols {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: var(--step);
  padding-bottom: 3.5rem;
}
.hero-lead { font-size: 1.1rem; }
.hero-lead p + p { margin-top: 1rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.75rem; }

.def-card { align-self: start; }
.def-card .u-caps { color: var(--accent); display: block; margin-bottom: 0.9rem; }
.def-card p {
  font-family: var(--display);
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.def-card .def-note { font-family: var(--body); font-size: 0.9rem; font-weight: 400; color: var(--ink-45); letter-spacing: 0; line-height: 1.5; margin-top: 1rem; }

.claim-strip { border-top: var(--bd); border-bottom: var(--bd); }
.claim-grid {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}
.claim {
  padding: 1.5rem 1.5rem 1.5rem 0;
  border-left: var(--bd-hair);
  padding-left: 1.5rem;
}
.claim:first-child { border-left: 0; padding-left: 0; }
.claim-k {
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.6rem;
  letter-spacing: -0.04em;
  display: block;
  margin-bottom: 0.35rem;
}
.claim-v { font-size: 0.85rem; color: var(--ink-70); line-height: 1.45; }

/* ---------- section shell -------------------------------------------- */

.section { border-top: var(--bd); padding: 4.5rem 0; }
.section:first-of-type { border-top: 0; }
.section--wash { background: var(--wash); }
.section--ink { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.section--ink .sec-title, .section--ink h3 { color: var(--paper); }
.section--ink .u-muted { color: #a8a8a8; }
.section--ink .panel { border-color: var(--paper); background: transparent; color: var(--paper); }
.section--ink .block-title { border-color: var(--paper); }
.section--ink .list-slash li,
.section--ink .list-no li,
.section--ink .card p,
.section--ink p { color: #b8b8b8; }
.section--ink .list-no li strong,
.section--ink strong { color: var(--paper); }
.section--ink .sec-body-label { color: #8a8a8a; }

.sec-head {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: var(--step);
  margin-bottom: 3rem;
}
.sec-num {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  padding-top: 0.5rem;
}
.sec-title {
  font-size: clamp(1.9rem, 4.6vw, 3.6rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.045em;
  line-height: 0.92;
  max-width: 24ch;
}
.sec-lead {
  font-size: 1.15rem;
  color: var(--ink-70);
  max-width: 58ch;
  margin: 1.5rem 0 0;
}
.section--ink .sec-lead { color: #b8b8b8; }

.sec-body { display: grid; grid-template-columns: 7rem minmax(0, 1fr); gap: var(--step); }
.sec-body > .sec-body-label { grid-column: 1; }
.sec-body-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-45);
}

.block { margin-bottom: 3rem; }
.block:last-child { margin-bottom: 0; }
.block-title {
  font-size: 1.15rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: var(--bd);
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
.block-title small {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 500;
}

/* ---------- quote ----------------------------------------------------- */

.quote { border-top: var(--bd); border-bottom: var(--bd); background: var(--ink); color: var(--paper); padding: 3.5rem 0; }
.quote blockquote {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.2vw, 3.1rem);
  letter-spacing: -0.04em;
  line-height: 1.02;
  text-transform: uppercase;
  max-width: 30ch;
}
.quote cite {
  display: block;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-style: normal;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 1.75rem;
}

/* ---------- numbered cards ------------------------------------------- */

.card { border: var(--bd); padding: 1.5rem; background: var(--paper); }
.card-n {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.9rem;
}
.card h3 {
  font-size: 1.05rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: 0.7rem;
}
.card p { font-size: 0.94rem; color: var(--ink-70); }
.card--flag { border-left: 8px solid var(--accent); }

/* ---------- table ----------------------------------------------------- */

.table-wrap { overflow-x: auto; border: var(--bd); }
table { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
thead th {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: left;
  padding: 0.8rem 1rem;
  white-space: nowrap;
}
tbody td { padding: 0.9rem 1rem; border-top: var(--bd-hair); vertical-align: top; color: var(--ink-70); }
tbody td:first-child { font-weight: 700; color: var(--ink); white-space: nowrap; }
tbody tr:first-child td { border-top: 0; }

/* ---------- lists ----------------------------------------------------- */

.list-slash { list-style: none; padding: 0; margin: 0; }
.list-slash li {
  padding-left: 1.6rem;
  position: relative;
  margin-bottom: 0.8rem;
  color: var(--ink-70);
}
.list-slash li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
}
.list-slash li strong { color: var(--ink); }
.section--ink .list-slash li strong { color: var(--paper); }

.list-no { list-style: none; padding: 0; margin: 0; }
.list-no li {
  padding-left: 1.6rem;
  position: relative;
  margin-bottom: 0.8rem;
  color: var(--ink-70);
}
.list-no li::before { content: "✕"; position: absolute; left: 0; color: var(--accent); font-family: var(--mono); font-size: 0.85rem; }
.list-no li strong { color: var(--ink); }

/* ---------- three jobs / lenses -------------------------------------- */

.jobs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: var(--bd); }
.job { padding: 1.75rem 1.5rem; border-left: var(--bd); }
.job:first-child { border-left: 0; }
.job .u-caps { color: var(--accent); display: block; margin-bottom: 0.8rem; }
.job h3 { font-size: 1.1rem; font-weight: 800; text-transform: uppercase; margin-bottom: 0.6rem; }
.job p { font-size: 0.9rem; color: var(--ink-70); }
.jobs-source {
  border: var(--bd);
  border-bottom: 0;
  background: var(--wash);
  padding: 1.5rem;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.jobs-source .u-caps { display: block; color: var(--accent); margin-bottom: 0.6rem; font-weight: 500; letter-spacing: 0.16em; }

.lens { border: var(--bd); padding: 1.25rem; }
.lens h4 {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.7rem;
}
.lens p { font-size: 0.9rem; color: var(--ink-70); }

/* ---------- anatomy -------------------------------------------------- */

.parts { border: var(--bd); }
.part { display: grid; grid-template-columns: 13rem minmax(0, 1fr); border-top: var(--bd-hair); }
.part:first-child { border-top: 0; }
.part dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 1.1rem 1.25rem;
  background: var(--wash);
  border-right: var(--bd-hair);
}
.part dd { margin: 0; padding: 1.1rem 1.25rem; color: var(--ink-70); font-size: 0.95rem; }
.part--opt dt { color: var(--accent); }

details.ex { border: var(--bd); margin-bottom: -2px; }
details.ex summary {
  cursor: pointer;
  list-style: none;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
details.ex summary::-webkit-details-marker { display: none; }
details.ex summary::after { content: "+"; margin-left: auto; color: var(--accent); font-weight: 700; }
details.ex[open] summary::after { content: "–"; }
details.ex[open] summary { border-bottom: var(--bd); background: var(--wash); }
details.ex summary .ex-lens { color: var(--accent); }
.ex-body { padding: 1.25rem; font-size: 0.94rem; }
.ex-body dl { margin: 0; display: grid; gap: 0.7rem; }
.ex-body dt { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-45); }
.ex-body dd { margin: 0.15rem 0 0; color: var(--ink-70); }

/* ---------- cycle ---------------------------------------------------- */

.cycle { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border: var(--bd); }
.cycle--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.step { padding: 1.5rem 1.25rem; border-left: var(--bd); position: relative; }
.step:first-child { border-left: 0; }
.step-n {
  font-family: var(--display);
  font-weight: 900;
  font-size: 2.4rem;
  letter-spacing: -0.05em;
  line-height: 1;
  color: var(--accent);
  display: block;
  margin-bottom: 0.8rem;
}
.step h3 { font-size: 0.98rem; font-weight: 800; text-transform: uppercase; margin-bottom: 0.6rem; line-height: 1.15; }
.step p { font-size: 0.88rem; color: var(--ink-70); }
.cycle-loop {
  border: var(--bd);
  border-top: 0;
  padding: 0.85rem 1.25rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.cycle-loop span { color: var(--accent); }

/* ---------- verdicts ------------------------------------------------- */

.signal { border: var(--bd); padding: 1.75rem; }
.signal-head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: 1rem;
  padding-bottom: 0.8rem;
  border-bottom: var(--bd);
}
.signal-head h3 { font-size: 1.25rem; font-weight: 900; text-transform: uppercase; }
.signal-head .u-caps { color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.chip {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: var(--bd);
  padding: 0.35rem 0.65rem;
}
.chip--pass { border-color: var(--pass); color: var(--pass); }
.chip--fail { border-color: var(--fail); color: var(--fail); }
.chip--hold { border-color: var(--hold); color: var(--hold); }

.sev { border: var(--bd); }
.sev-row { display: grid; grid-template-columns: 9rem minmax(0, 1fr); border-top: var(--bd-hair); }
.sev-row:first-child { border-top: 0; }
.sev-row > span:first-child {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.9rem 1rem;
  border-right: var(--bd-hair);
}
.sev-row > span:last-child { padding: 0.9rem 1rem; color: var(--ink-70); font-size: 0.93rem; }
.sev-row--blocker > span:first-child { background: var(--accent); color: var(--paper); }
.sev-row--major > span:first-child { background: var(--ink); color: var(--paper); }
.sev-row--minor > span:first-child { background: var(--wash); }

/* ---------- worked example ------------------------------------------- */

.beats { border-left: var(--bd); padding-left: 0; list-style: none; margin: 0; }
.beat { position: relative; padding: 0 0 2.25rem 2rem; }
.beat:last-child { padding-bottom: 0; }
.beat::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 0.45rem;
  width: 16px;
  height: 16px;
  background: var(--paper);
  border: var(--bd);
}
.beat--fail::before { background: var(--accent); border-color: var(--accent); }
.beat--pass::before { background: var(--pass); border-color: var(--pass); }
.beat .u-caps { color: var(--accent); display: block; margin-bottom: 0.5rem; }
.beat h3 { font-size: 1.05rem; font-weight: 800; text-transform: uppercase; margin-bottom: 0.6rem; }
.beat p, .beat li { font-size: 0.94rem; color: var(--ink-70); }
.beat p, .beat ul { max-width: 74ch; }

.scenario-quote {
  border: var(--bd);
  border-left: 8px solid var(--accent);
  background: var(--wash);
  padding: 1.5rem;
  font-size: 1rem;
  line-height: 1.55;
}
.scenario-quote .u-caps { display: block; color: var(--accent); margin-bottom: 0.8rem; }

/* ---------- code ----------------------------------------------------- */

.code {
  border: var(--bd);
  background: var(--ink);
  color: #e8e8e8;
  overflow: hidden;
}
.code-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid #333;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8a8a8a;
}
.code-bar button {
  background: transparent;
  border: 1px solid #444;
  color: #cfcfcf;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
}
.code-bar button:hover { border-color: var(--accent); color: var(--accent); }
.code pre { margin: 0; padding: 1.25rem; overflow-x: auto; font-family: var(--mono); font-size: 0.82rem; line-height: 1.7; }
.code .k { color: #ff8a66; }
.code .s { color: #9fd6a0; }
.code .n { color: #8ab4f8; }
.code .p { color: #6f6f6f; }

/* ---------- closing / footer ----------------------------------------- */

.closing h2 {
  font-size: clamp(2.2rem, 7vw, 5.4rem);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.05em;
  line-height: 0.9;
  margin-bottom: 2rem;
}
.start { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 2px solid var(--paper); }
.start > div { padding: 1.5rem; border-left: 2px solid var(--paper); }
.start > div:first-child { border-left: 0; }
.start .u-caps { color: var(--accent); display: block; margin-bottom: 0.8rem; }
.start p { font-size: 0.95rem; color: #b8b8b8; }
.start strong { color: var(--paper); }

.site-footer { border-top: var(--bd); padding: 2.5rem 0; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: baseline; justify-content: space-between; }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.25rem; }
.footer-links a { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; border-bottom: 2px solid var(--accent); padding-bottom: 2px; }
.footer-note { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-45); }

/* ---------- reveal ---------------------------------------------------- */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- responsive ------------------------------------------------ */

@media (max-width: 1080px) {
  .cycle { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step { border-left: 0; }
  .step:nth-child(even) { border-left: var(--bd); }
  .step:nth-child(n+3) { border-top: var(--bd); }
  .step:last-child:nth-child(odd) { grid-column: 1 / -1; }
  .claim-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .claim:nth-child(odd) { border-left: 0; padding-left: 0; }
  .claim:nth-child(n+3) { border-top: var(--bd-hair); }
}

@media (max-width: 920px) {
  :root { --gut: 1.25rem; --step: 1.25rem; }
  .toc-dropdown {
    position: fixed;
    top: 4.25rem;
    left: 0;
    right: 0;
    min-width: auto;
    box-shadow: none;
    border-left: 0;
    border-right: 0;
    padding: 0.5rem var(--gut) 1.25rem;
  }
  .index-list { grid-template-columns: 1fr; gap: 0; }
  .index-list a { display: block; padding: 0.6rem 0; border-bottom: 1px solid var(--hair); }
  .hero-cols { grid-template-columns: minmax(0, 1fr); }
  .sec-head, .sec-body { grid-template-columns: minmax(0, 1fr); }
  .sec-body-label { display: none; }
  .grid--3, .grid--4, .jobs, .start { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .job, .start > div { border-left: 0; }
  .job:nth-child(even) { border-left: var(--bd); }
  .job:nth-child(n+3) { border-top: var(--bd); }
  .start > div:nth-child(even) { border-left: 2px solid var(--paper); }
  .start > div:nth-child(n+3) { border-top: 2px solid var(--paper); }
  .job:last-child:nth-child(odd),
  .start > div:last-child:nth-child(odd) { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .section { padding: 3rem 0; }
  .grid--2, .grid--3, .grid--4, .jobs, .start, .cycle { grid-template-columns: minmax(0, 1fr); }
  .job, .step, .job:nth-child(even), .step:nth-child(even) { border-left: 0; border-top: var(--bd); }
  .start > div, .start > div:nth-child(even) { border-left: 0; border-top: 2px solid var(--paper); }
  .job:first-child, .step:first-child, .start > div:first-child { border-top: 0; }
  .claim-grid { grid-template-columns: minmax(0, 1fr); }
  .claim { border-left: 0; padding-left: 0; border-top: var(--bd-hair); }
  .claim:first-child { border-top: 0; }
  .part, .sev-row { grid-template-columns: minmax(0, 1fr); }
  .part dt { border-right: 0; border-bottom: var(--bd-hair); }
  .sev-row > span:first-child { border-right: 0; }
  .panel--offset, .panel--offset-accent { box-shadow: 5px 5px 0 var(--ink); }
}