/* kubepath — a request path, read as a trace.
   Colour carries provenance: violet marks a choice that traces back to
   "no cloud load balancer"; rust marks the two findings. Nothing is
   decorative. */

:root {
  --paper:        #e9ecf1;
  --paper-raised: #ffffff;
  --paper-sunk:   #dfe4ec;
  --ink:          #141a24;
  --ink-2:        #4d5a6c;
  --ink-3:        #78859a;
  --rule:         #c6cfdb;
  --rule-soft:    #d8dfe8;

  --constrained:      #5b2fd6;
  --constrained-wash: #ece5fd;
  --constrained-edge: #c3b0f5;

  --errata:      #b23a22;
  --errata-wash: #fbe9e4;
  --errata-edge: #eec2b5;

  --ok:      #1d6b4f;
  --ok-wash: #dff0e7;

  --code-bg:   #161d29;
  --code-ink:  #d7dfeb;
  --code-dim:  #7b8798;
  --code-rule: #2a3444;

  --display: 'Archivo', ui-sans-serif, system-ui, sans-serif;
  --narrow:  'Archivo Narrow', 'Archivo', ui-sans-serif, sans-serif;
  --body:    'Source Serif 4', Georgia, 'Times New Roman', serif;
  --mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --measure: 68ch;
  --shell:   1180px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17.5px;
  line-height: 1.62;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: .6rem 1rem;
  z-index: 50;
  font-family: var(--narrow);
}
.skip:focus { left: 0; }

:focus-visible {
  outline: 2.5px solid var(--constrained);
  outline-offset: 2px;
  border-radius: 2px;
}

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

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1.1rem 1.5rem .9rem;
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  text-decoration: none;
}

.brand-mark {
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--constrained);
  box-shadow: 0 0 0 4px var(--constrained-wash);
  flex: none;
}

.brand-name {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.16rem;
  letter-spacing: -.028em;
}

.masthead-nav {
  display: flex;
  gap: 1.35rem;
  flex-wrap: wrap;
  font-family: var(--narrow);
  font-weight: 600;
  font-size: .95rem;
  letter-spacing: .01em;
}

.masthead-nav a {
  text-decoration: none;
  color: var(--ink-2);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}
.masthead-nav a:hover { color: var(--ink); border-bottom-color: var(--rule); }

.pip {
  display: inline-block;
  margin-left: .35rem;
  background: var(--errata);
  color: #fff;
  font-family: var(--mono);
  font-size: .68rem;
  font-weight: 600;
  padding: .05rem .34rem;
  border-radius: 2px;
  vertical-align: 1px;
}

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

main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 .7rem;
}

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

.hero { padding: 3.4rem 0 1.2rem; }

.hero-constraint {
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--constrained);
  background: var(--constrained-wash);
  border: 1px solid var(--constrained-edge);
  padding: .3rem .6rem;
  border-radius: 2px;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.3rem, 6vw, 4.15rem);
  line-height: .99;
  letter-spacing: -.042em;
  margin: 0 0 1.15rem;
  max-width: 22ch;
}

.hero h1 em {
  font-style: normal;
  color: var(--constrained);
}

.hero-lede {
  max-width: 58ch;
  font-size: 1.2rem;
  line-height: 1.56;
  color: var(--ink-2);
  margin: 0 0 .9rem;
}
.hero-lede strong { color: var(--ink); font-weight: 600; }

/* ---------- the rail: signature element ---------- */

.rail {
  position: relative;
  margin: 2.6rem 0 1rem;
  padding-top: 1.9rem;
}

.rail-line {
  position: absolute;
  top: .62rem;
  left: 0; right: 0;
  height: 2px;
  background: linear-gradient(
    to right,
    var(--rule) 0%, var(--rule) 100%
  );
  overflow: visible;
}

.rail-packet {
  position: absolute;
  top: -3px;
  left: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--constrained);
  box-shadow: 0 0 0 3px var(--paper), 0 0 0 5px var(--constrained-wash);
}

body.trace .rail-packet { animation: trace 2.5s cubic-bezier(.42,0,.35,1) forwards; }

@keyframes trace {
  from { left: 0; opacity: 1; }
  to   { left: 100%; opacity: 1; }
}

.rail-segs {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  gap: 0;
}

.seg {
  position: relative;
  display: block;
  text-decoration: none;
  padding: 0 .7rem 0 0;
  border-left: 1px solid var(--rule-soft);
  padding-left: .6rem;
  min-width: 0;
}
.seg:first-child { border-left: 0; padding-left: 0; }

.seg-dot {
  position: absolute;
  top: -1.35rem;
  left: -5px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--rule);
}
.seg:first-child .seg-dot { left: -4px; }
.seg-constrained .seg-dot { border-color: var(--constrained); background: var(--constrained); }

.seg-n {
  display: block;
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--ink-3);
  margin-bottom: .12rem;
}

.seg-wire {
  display: block;
  font-family: var(--mono);
  font-size: .7rem;
  line-height: 1.3;
  color: var(--constrained);
  min-height: 1.8em;
  overflow-wrap: break-word;
}
.seg:not(.seg-constrained) .seg-wire { color: var(--ink-3); }

.seg-title {
  display: block;
  font-family: var(--narrow);
  font-weight: 600;
  font-size: .93rem;
  line-height: 1.22;
  letter-spacing: -.005em;
  color: var(--ink-2);
  margin-top: .2rem;
}
.seg:hover .seg-title { color: var(--ink); }
.seg-active .seg-title { color: var(--ink); }
.seg-active .seg-dot {
  box-shadow: 0 0 0 4px var(--constrained-wash);
  border-color: var(--constrained);
  background: var(--constrained);
}

body.trace .seg { animation: segIn .5s ease-out backwards; animation-delay: calc(var(--i) * .12s + .1s); }
@keyframes segIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: none; } }

.rail-legend {
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--ink-3);
  margin: 1.6rem 0 0;
  padding-top: .9rem;
  border-top: 1px solid var(--rule-soft);
}
.rail-legend span { display: inline-flex; align-items: center; gap: .42rem; }
.rail-legend i {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--rule); flex: none;
}
.rail-legend i.c { background: var(--constrained); }

/* ---------- track sections ---------- */

.track { padding: 3.2rem 0 .6rem; border-top: 1px solid var(--rule); margin-top: 3rem; }
.track:first-of-type { border-top: 0; margin-top: 0; }

.track-head { margin-bottom: 1.8rem; }
.track-head h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.85rem;
  letter-spacing: -.03em;
  margin: 0 0 .3rem;
}
.track-head p { margin: 0; color: var(--ink-2); max-width: 54ch; }

.hop-list { display: grid; gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); }

.hop-row {
  display: grid;
  grid-template-columns: 4.2rem 1fr auto;
  gap: 1.3rem;
  align-items: start;
  background: var(--paper-raised);
  padding: 1.15rem 1.3rem;
  text-decoration: none;
  transition: background .12s ease;
}
.hop-row:hover { background: #fbfcfe; }

.hop-n {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--ink-3);
  padding-top: .28rem;
}
.hop-row.is-constrained .hop-n { color: var(--constrained); }

.hop-main h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: -.02em;
  margin: 0 0 .22rem;
}
.hop-main p { margin: 0; color: var(--ink-2); font-size: .97rem; line-height: 1.5; }

.hop-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: .4rem;
  padding-top: .25rem;
}

.tag {
  font-family: var(--mono);
  font-size: .67rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: .16rem .42rem;
  border-radius: 2px;
  white-space: nowrap;
}
.tag-c { background: var(--constrained-wash); color: var(--constrained); border: 1px solid var(--constrained-edge); }
.tag-e { background: var(--errata-wash); color: var(--errata); border: 1px solid var(--errata-edge); }
.tag-ok { background: var(--ok-wash); color: var(--ok); border: 1px solid #b9dbc9; }
.tag-q { background: var(--paper-sunk); color: var(--ink-2); border: 1px solid var(--rule); }

.check {
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--ok);
  white-space: nowrap;
}

/* ---------- hop page ---------- */

.subnav {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
}

.hop-head { padding: 2.2rem 0 1.6rem; border-bottom: 1px solid var(--rule); }

.hop-head h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  letter-spacing: -.038em;
  line-height: 1.03;
  margin: 0 0 .7rem;
  max-width: 26ch;
}

.hop-head .summary {
  font-size: 1.12rem;
  color: var(--ink-2);
  max-width: 56ch;
  margin: 0;
}

.hop-meta {
  display: flex;
  gap: .8rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}
.hop-meta .m {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.prose { max-width: var(--measure); padding: 2rem 0 0; }
.prose p { margin: 0 0 1.15rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 600; }
.prose em { font-style: italic; }

code {
  font-family: var(--mono);
  font-size: .86em;
  background: var(--paper-sunk);
  padding: .1em .32em;
  border-radius: 2px;
  overflow-wrap: break-word;
}

.callout {
  max-width: var(--measure);
  margin: 2rem 0 0;
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--rule);
  background: var(--paper-raised);
  font-size: .97rem;
  line-height: 1.55;
}
.callout .k {
  display: block;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .35rem;
}
.callout-constrained { border-left-color: var(--constrained); }
.callout-constrained .k { color: var(--constrained); }
.callout-errata { border-left-color: var(--errata); background: var(--errata-wash); }
.callout-errata .k { color: var(--errata); }

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

.code {
  margin: 2.2rem 0 0;
  background: var(--code-bg);
  border-radius: 3px;
  overflow: hidden;
}

.code-label {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--code-dim);
  padding: .62rem .95rem;
  border-bottom: 1px solid var(--code-rule);
  letter-spacing: .02em;
}

.code pre {
  margin: 0;
  padding: 1rem .95rem 1.15rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .8rem;
  line-height: 1.68;
  color: var(--code-ink);
  tab-size: 2;
}
.code pre code { background: none; padding: 0; font-size: inherit; }

/* ---------- annotated file reader (the deep-dive tool) ---------- */

.dive-head { padding: 2.2rem 0 1.5rem; }
.dive-path {
  font-family: var(--mono);
  font-size: .84rem;
  color: var(--constrained);
  margin: 0 0 .6rem;
  overflow-wrap: break-word;
}
.dive-head h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.85rem, 4.2vw, 2.7rem);
  letter-spacing: -.038em;
  line-height: 1.04;
  margin: 0 0 .85rem;
}
.dive-lede { font-size: 1.1rem; color: var(--ink-2); max-width: 60ch; margin: 0; }

.reader {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  gap: 1.6rem;
  align-items: start;
  margin: 2rem 0 0;
}

.file {
  background: var(--code-bg);
  border-radius: 3px;
  overflow: hidden;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
}

.file-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .6rem .9rem;
  border-bottom: 1px solid var(--code-rule);
  font-family: var(--mono);
  font-size: .71rem;
  color: var(--code-dim);
}
.file-bar b { color: var(--code-ink); font-weight: 500; }

.file-scroll { overflow: auto; padding: .55rem 0 1rem; }

.ln {
  display: grid;
  grid-template-columns: 2.8rem 1fr;
  font-family: var(--mono);
  font-size: .795rem;
  line-height: 1.72;
  border: 0;
  background: none;
  color: var(--code-ink);
  width: 100%;
  text-align: left;
  padding: 0;
  cursor: default;
}
.ln-num {
  color: #4c5768;
  text-align: right;
  padding-right: .85rem;
  user-select: none;
  font-size: .72rem;
}
.ln-txt { white-space: pre-wrap; overflow-wrap: break-word; padding-right: .9rem; }

.ln-noted { cursor: pointer; }
.ln-noted .ln-txt {
  border-left: 2px solid var(--constrained);
  padding-left: .5rem;
  margin-left: -.5rem;
  background: rgba(123, 86, 235, .12);
}
.ln-noted:hover .ln-txt { background: rgba(123, 86, 235, .22); }
.ln-noted .ln-num { color: #9b86e8; }
.ln-noted.on .ln-txt { background: rgba(123, 86, 235, .32); }
.ln-noted.on .ln-num { color: #cbbdf7; }

.notes { display: grid; gap: 1rem; }

.note {
  background: var(--paper-raised);
  border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--constrained);
  border-radius: 2px;
  padding: 1.05rem 1.2rem;
  scroll-margin-top: 1.5rem;
}
.note.on { border-color: var(--constrained-edge); border-left-color: var(--constrained); box-shadow: 0 2px 14px rgba(91,47,214,.13); }

.note-line {
  font-family: var(--mono);
  font-size: .69rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--constrained);
  margin: 0 0 .4rem;
}
.note h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.03rem;
  letter-spacing: -.018em;
  line-height: 1.28;
  margin: 0 0 .55rem;
}
.note-body { font-size: .96rem; line-height: 1.58; }
.note-body p { margin: 0 0 .7rem; }
.note-body p:last-child { margin-bottom: 0; }
.note-body pre {
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: var(--mono);
  font-size: .73rem;
  line-height: 1.6;
  padding: .7rem .8rem;
  border-radius: 2px;
  overflow-x: auto;
  margin: .6rem 0;
  white-space: pre;
}

/* ---------- quiz ---------- */

.quiz { max-width: var(--measure); margin: 3rem 0 0; padding-top: 2rem; border-top: 1px solid var(--rule); }
.quiz > h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -.025em;
  margin: 0 0 .3rem;
}
.quiz > p.quiz-lede { margin: 0 0 1.7rem; color: var(--ink-2); font-size: .98rem; }

.qcard {
  background: var(--paper-raised);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: 1.2rem 1.3rem;
  margin-bottom: 1.1rem;
}

.qprompt {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.03rem;
  line-height: 1.42;
  letter-spacing: -.012em;
  margin: 0 0 1rem;
}

.qchoices { display: grid; gap: .45rem; }

.qc {
  display: grid;
  grid-template-columns: 1.5rem 1fr;
  gap: .55rem;
  align-items: start;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: .6rem .75rem;
  font-family: inherit;
  font-size: .95rem;
  line-height: 1.45;
  color: var(--ink);
  cursor: pointer;
  transition: background .1s ease, border-color .1s ease;
}
.qc:hover:not(:disabled) { background: #fff; border-color: var(--rule); }
.qc:disabled { cursor: default; }
.qc-k {
  font-family: var(--mono);
  font-size: .74rem;
  color: var(--ink-3);
  padding-top: .12rem;
}
.qc.picked { border-color: var(--ink-2); background: #fff; }
.qc.right { border-color: var(--ok); background: var(--ok-wash); }
.qc.right .qc-k { color: var(--ok); }
.qc.wrong { border-color: var(--errata); background: var(--errata-wash); }
.qc.wrong .qc-k { color: var(--errata); }

.qexplain {
  margin: .9rem 0 0;
  padding: .8rem .9rem;
  background: var(--paper-sunk);
  border-left: 3px solid var(--ink-3);
  font-size: .93rem;
  line-height: 1.55;
}
.qexplain.right { border-left-color: var(--ok); }
.qexplain.wrong { border-left-color: var(--errata); }
.qexplain b {
  display: block;
  font-family: var(--mono);
  font-size: .68rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  margin-bottom: .3rem;
}
.qexplain.right b { color: var(--ok); }
.qexplain.wrong b { color: var(--errata); }

/* ---------- foot nav / mark read ---------- */

.hop-foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  max-width: var(--measure);
  margin: 2.6rem 0 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
}

.btn {
  font-family: var(--narrow);
  font-weight: 600;
  font-size: .93rem;
  letter-spacing: .01em;
  padding: .5rem .9rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  border-radius: 2px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { background: #232c3a; }
.btn-quiet { background: none; color: var(--ink); border-color: var(--rule); }
.btn-quiet:hover { background: var(--paper-raised); border-color: var(--ink-3); }
.btn-done { background: var(--ok-wash); color: var(--ok); border-color: #b9dbc9; }
.btn-danger { background: none; color: var(--errata); border-color: var(--errata-edge); }
.btn-danger:hover { background: var(--errata-wash); }

.pager { display: flex; gap: .6rem; flex-wrap: wrap; }

/* ---------- errata ---------- */

.err-hero { padding: 2.8rem 0 1.4rem; }
.err-hero h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.1rem);
  letter-spacing: -.04em;
  line-height: 1.02;
  margin: 0 0 1rem;
}
.err-hero p { max-width: 62ch; color: var(--ink-2); font-size: 1.1rem; margin: 0 0 .9rem; }

.finding {
  border: 1px solid var(--errata-edge);
  border-top: 3px solid var(--errata);
  background: var(--paper-raised);
  border-radius: 2px;
  padding: 1.6rem 1.6rem 1.7rem;
  margin: 2rem 0 0;
}

.finding-bar {
  display: flex;
  gap: .7rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: .85rem;
}
.finding-n {
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--errata);
  letter-spacing: .06em;
}
.finding-file {
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--ink-2);
  overflow-wrap: break-word;
}

.finding h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.45rem;
  letter-spacing: -.028em;
  line-height: 1.16;
  margin: 0 0 1.1rem;
  max-width: 34ch;
}

.finding h4 {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .11em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 1.7rem 0 .6rem;
  padding-bottom: .35rem;
  border-bottom: 1px solid var(--rule-soft);
}
.finding h4:first-of-type { margin-top: 0; }

.finding p { margin: 0 0 .9rem; max-width: 66ch; }
.finding p:last-child { margin-bottom: 0; }

.diff {
  background: var(--code-bg);
  border-radius: 3px;
  overflow: hidden;
  margin: .3rem 0 1rem;
}
.diff-label {
  font-family: var(--mono);
  font-size: .71rem;
  color: var(--code-dim);
  padding: .55rem .9rem;
  border-bottom: 1px solid var(--code-rule);
}
.diff pre {
  margin: 0;
  padding: .7rem 0 .9rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: .78rem;
  line-height: 1.7;
  color: var(--code-ink);
}
.diff .dl { display: block; padding: 0 .9rem; white-space: pre; }
.diff .dl-add { background: rgba(56,158,110,.2); color: #a5e6c6; }
.diff .dl-add::before { content: '+ '; color: #59c795; }
.diff .dl-ctx::before { content: '  '; }

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

.stack-tbl { margin: 2.2rem 0 0; border: 1px solid var(--rule-soft); background: var(--rule-soft); display: grid; gap: 1px; }
.stack-row {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  gap: 1.3rem;
  background: var(--paper-raised);
  padding: 1.05rem 1.25rem;
}
.stack-layer {
  font-family: var(--narrow);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .01em;
}
.stack-row.is-constrained .stack-layer { color: var(--constrained); }
.stack-what { margin: 0 0 .4rem; font-size: .98rem; line-height: 1.5; }
.stack-note { margin: 0; font-size: .9rem; color: var(--ink-2); line-height: 1.5; }
.stack-note a { color: var(--constrained); text-decoration-thickness: 1px; text-underline-offset: 2px; }

/* ---------- dives index ---------- */

.dive-cards { display: grid; gap: 1.2rem; margin: 2.2rem 0 0; }
.dive-card {
  display: block;
  text-decoration: none;
  background: var(--paper-raised);
  border: 1px solid var(--rule-soft);
  border-left: 3px solid var(--constrained);
  border-radius: 2px;
  padding: 1.4rem 1.5rem;
}
.dive-card:hover { border-color: var(--constrained-edge); }
.dive-card .dive-path { font-size: .8rem; margin-bottom: .5rem; }
.dive-card h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -.026em;
  margin: 0 0 .5rem;
}
.dive-card p { margin: 0; color: var(--ink-2); font-size: .98rem; line-height: 1.52; max-width: 64ch; }
.dive-card .dive-foot {
  display: flex;
  gap: .8rem;
  flex-wrap: wrap;
  margin-top: .9rem;
  font-family: var(--mono);
  font-size: .71rem;
  color: var(--ink-3);
}

/* ---------- progress ---------- */

.bar {
  height: 6px;
  background: var(--paper-sunk);
  border-radius: 99px;
  overflow: hidden;
  margin: .5rem 0 0;
}
.bar span { display: block; height: 100%; background: var(--constrained); border-radius: 99px; }

.pgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); margin: 2rem 0 0; }
.pcell { background: var(--paper-raised); padding: 1.15rem 1.25rem; }
.pcell .big {
  font-family: var(--display);
  font-weight: 800;
  font-size: 2.1rem;
  letter-spacing: -.04em;
  line-height: 1;
  display: block;
  margin-bottom: .3rem;
}
.pcell .lbl { font-family: var(--mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }

.misslist { margin: 1.4rem 0 0; display: grid; gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); }
.missrow { background: var(--paper-raised); padding: .85rem 1.1rem; display: grid; grid-template-columns: 1fr 5rem; gap: 1rem; align-items: center; }
.missrow p { margin: 0; font-size: .94rem; line-height: 1.45; }
.missrow .rate { font-family: var(--mono); font-size: .82rem; text-align: right; color: var(--errata); }

.empty {
  margin: 2rem 0 0;
  padding: 1.6rem;
  border: 1px dashed var(--rule);
  border-radius: 2px;
  text-align: center;
  color: var(--ink-2);
}
.empty p { margin: 0 0 1rem; }

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

@media (max-width: 940px) {
  .reader { grid-template-columns: 1fr; }
  .file { position: static; max-height: 62vh; }
}

@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .rail { padding-top: 0; }
  .rail-line { display: none; }
  .rail-segs { grid-auto-flow: row; gap: 1px; background: var(--rule-soft); border: 1px solid var(--rule-soft); }
  .seg {
    display: grid;
    grid-template-columns: 2.2rem 1fr;
    gap: .7rem;
    align-items: baseline;
    background: var(--paper-raised);
    border-left: 0;
    padding: .8rem .9rem;
  }
  .seg-dot { display: none; }
  .seg-n { grid-row: span 2; padding-top: .1rem; }
  .seg-title { margin-top: 0; order: -1; }
  .seg-wire { min-height: 0; }
  body.trace .seg { animation: none; }
  .hop-row { grid-template-columns: 2.4rem 1fr; }
  .hop-aside { grid-column: 2; align-items: flex-start; flex-direction: row; flex-wrap: wrap; }
  .stack-row { grid-template-columns: 1fr; gap: .5rem; }
  .missrow { grid-template-columns: 1fr auto; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  body.trace .rail-packet { left: 100%; }
}