/* Shipyard Control Loop Atlas: engineering-sheet aesthetic.
   Tokens first; everything styles through them. Dark is the native mode,
   light is a fully designed alternative (drafting paper). */

:root {
  color-scheme: dark;
  --paper: #15171b;
  --sheet: #1b1e24;
  --ink: #eceef1;
  --ink-2: #a6acb8;
  --ink-3: #737a87;
  --line: #2e323a;
  --line-2: #3a3f49;
  --signal: #4a90e2;
  --signal-soft: rgba(74, 144, 226, 0.14);
  --good: #3fae56;
  --good-soft: rgba(63, 174, 86, 0.13);
  --warn: #d99b28;
  --warn-soft: rgba(217, 155, 40, 0.14);
  --crit: #e66767;
  --crit-soft: rgba(230, 103, 103, 0.12);
  --block: #22262d;
  --block-line: #4a505c;
}
@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --paper: #f6f5f1;
    --sheet: #fdfdfb;
    --ink: #191b20;
    --ink-2: #555a64;
    --ink-3: #8a8f99;
    --line: #d8d6cf;
    --line-2: #c2c0b8;
    --signal: #2a78d6;
    --signal-soft: rgba(42, 120, 214, 0.10);
    --good: #008300;
    --good-soft: rgba(0, 131, 0, 0.09);
    --warn: #b97a00;
    --warn-soft: rgba(237, 161, 0, 0.12);
    --crit: #cf3a39;
    --crit-soft: rgba(227, 73, 72, 0.09);
    --block: #ffffff;
    --block-line: #b9bec9;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
.mono, code, .chip, .cap, .sig {
  font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}
a { color: var(--signal); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 2px; }

.atlas { max-width: 1100px; margin: 0 auto; padding: 0 24px 96px; }

/* ── Page heading ────────────────────────────────────────────── */
header.pagehead { margin: 44px 0 20px; display: flex; align-items: center; gap: 18px; }
header.pagehead .mark { width: 62px; height: auto; max-width: 62px; color: var(--ink); flex: none; }
header.pagehead h1 {
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  font-weight: 750;
}
header.pagehead p {
  margin: 6px 0 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ── Nav + section scaffolding ───────────────────────────────── */
nav.toc {
  position: sticky; top: 0; z-index: 5;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  display: flex; gap: 4px; flex-wrap: wrap;
  padding: 10px 0;
  margin-bottom: 8px;
}
nav.toc a {
  color: var(--ink-2); text-decoration: none;
  font-size: 12.5px; letter-spacing: 0.02em;
  padding: 5px 11px; border-radius: 3px;
  border: 1px solid transparent;
}
nav.toc a:hover { color: var(--ink); border-color: var(--line-2); }

section { margin-top: 76px; }
.eyebrow {
  font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--signal); font-weight: 650;
  margin: 0 0 8px;
}
section > h2 {
  margin: 0 0 10px;
  font-size: clamp(21px, 2.6vw, 28px);
  letter-spacing: -0.01em;
  font-weight: 720;
  text-wrap: balance;
}
.lede { color: var(--ink-2); max-width: 68ch; margin: 0 0 28px; }
.lede strong { color: var(--ink); }

/* ── Diagram frames (shared) ─────────────────────────────────── */
figure.diagram {
  margin: 0;
  border: 1px solid var(--line-2);
  background: var(--sheet);
  padding: 10px 6px 2px;
  overflow-x: auto;
}
figure.diagram svg { display: block; width: 100%; height: auto; }
figure.diagram figcaption {
  font-size: 12.5px; color: var(--ink-3);
  padding: 10px 16px 12px;
  border-top: 1px dashed var(--line);
  margin-top: 6px;
}

/* SVG vocabulary: one visual language across every schematic */
svg text { fill: var(--ink); font-family: system-ui, sans-serif; }
svg .t-name { font-size: 13.5px; font-weight: 650; }
svg .t-sub  { font-size: 10.5px; fill: var(--ink-2); font-family: ui-monospace, Menlo, monospace; }
svg .t-edge { font-size: 10.5px; fill: var(--ink-2); font-family: ui-monospace, Menlo, monospace; }
svg .t-edge-good { fill: var(--good); }
svg .t-edge-crit { fill: var(--crit); }
svg .t-zone { font-size: 10px; letter-spacing: 0.14em; fill: var(--ink-3); font-weight: 600; }
svg .blk { fill: var(--block); stroke: var(--block-line); stroke-width: 1.2; }
svg .blk-strong { stroke: var(--ink-2); stroke-width: 1.5; }
svg .blk-good   { fill: var(--good-soft);   stroke: var(--good); }
svg .blk-crit   { fill: var(--crit-soft);   stroke: var(--crit); }
svg .blk-warn   { fill: var(--warn-soft);   stroke: var(--warn); }
svg .blk-signal { fill: var(--signal-soft); stroke: var(--signal); }
svg .wire      { stroke: var(--ink-3); stroke-width: 1.3; fill: none; }
svg .wire-loop { stroke: var(--signal); stroke-width: 2; fill: none; }
svg .wire-good { stroke: var(--good); stroke-width: 1.6; fill: none; }
svg .wire-crit { stroke: var(--crit); stroke-width: 1.6; fill: none; }
svg .wire-warn { stroke: var(--warn); stroke-width: 1.4; fill: none; }
svg .wire-dash { stroke-dasharray: 5 4; }
svg .zone { fill: none; stroke: var(--line-2); stroke-dasharray: 2 4; }
svg .flow {
  stroke: var(--signal); stroke-width: 2; fill: none;
  stroke-dasharray: 3 9; stroke-linecap: round;
  animation: march 1.6s linear infinite;
  opacity: 0.9;
}
@keyframes march { to { stroke-dashoffset: -12; } }
@media (prefers-reduced-motion: reduce) { svg .flow { animation: none; display: none; } }

/* ── Nesting diagram (overview) ──────────────────────────────── */
.nest-wrap { display: grid; grid-template-columns: 1fr 300px; gap: 20px; }
@media (max-width: 900px) { .nest-wrap { grid-template-columns: 1fr; } }
#nest-info {
  border: 1px solid var(--line-2);
  background: var(--sheet);
  padding: 18px 20px;
  align-self: start;
  position: sticky; top: 56px;
}
#nest-info .k {
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-3);
}
#nest-info h3 { margin: 4px 0 8px; font-size: 16px; }
#nest-info p { margin: 0; font-size: 13.5px; color: var(--ink-2); }
#nest-info .cap { margin-top: 12px; display: inline-block; }
#nest-info .cap[hidden] { display: none; }
svg .ring { fill: var(--sheet); stroke: var(--line-2); stroke-width: 1.4; cursor: pointer; }
svg .ring:hover, svg .ring.hot { stroke: var(--signal); stroke-width: 2; fill: var(--signal-soft); }
svg .ring-author { stroke: var(--warn); stroke-dasharray: 6 5; fill: none; }
svg .ring-author:hover, svg .ring-author.hot { stroke-width: 2.2; fill: var(--warn-soft); }
svg .ring-heal { fill: var(--good-soft); stroke: var(--good); opacity: 0.85; cursor: pointer; }
svg .ring-heal:hover, svg .ring-heal.hot { stroke-width: 2; opacity: 1; }
svg .t-ring { font-size: 12.5px; font-weight: 650; pointer-events: none; }
svg .t-ring-sub { font-size: 10px; fill: var(--ink-3); font-family: ui-monospace, Menlo, monospace; pointer-events: none; }

/* ── Interlock map ───────────────────────────────────────────── */
.edge-filters { display: flex; gap: 8px; margin: 0 0 12px; flex-wrap: wrap; }
.edge-filters button {
  font: 12px/1 ui-monospace, Menlo, monospace;
  padding: 6px 12px;
  background: var(--sheet); color: var(--ink-2);
  border: 1px solid var(--line-2); border-radius: 999px;
  cursor: pointer;
}
.edge-filters button[aria-pressed="true"] { color: var(--ink); border-color: var(--ink-3); }
.edge-filters button .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.edge-filters .dot-work { background: var(--signal); }
.edge-filters .dot-esc  { background: var(--crit); }
.edge-filters .dot-fb   { background: var(--good); }
#interlock-svg .il-edge { transition: opacity 0.2s; }
#interlock-svg.filtered .il-edge { opacity: 0.10; }
#interlock-svg.filtered .il-edge.on { opacity: 1; }
svg .il-chip { fill: var(--block); stroke: var(--block-line); stroke-width: 1.3; }
svg .il-edge text { pointer-events: none; }

/* ── Loop gallery (mini circuits) ────────────────────────────── */
.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 860px) { .gallery { grid-template-columns: 1fr; } }
.loopcard {
  border: 1px solid var(--line-2);
  background: var(--sheet);
  display: flex; flex-direction: column;
}
.loopcard .head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  padding: 14px 18px 0;
}
.loopcard h3 { margin: 0; font-size: 16px; }
.loopcard .cadence { font-size: 11.5px; color: var(--ink-3); white-space: nowrap; }
.loopcard svg { display: block; width: 100%; height: auto; padding: 4px 6px; }
.loopcard ul {
  margin: 0; padding: 12px 18px 16px 34px;
  border-top: 1px dashed var(--line);
  font-size: 13px; color: var(--ink-2);
  display: grid; gap: 6px;
}
.loopcard li::marker { color: var(--ink-3); }
.loopcard li b, .loopcard li code { color: var(--ink); }
.loopcard li code { font-size: 12px; }
.cap {
  font-size: 11.5px;
  color: var(--ink);
  background: var(--warn-soft);
  border: 1px solid color-mix(in srgb, var(--warn) 45%, transparent);
  padding: 3px 9px; border-radius: 999px;
  white-space: nowrap;
}

/* ── Story stepper ───────────────────────────────────────────── */
.stepper {
  border: 1px solid var(--line-2); border-top: none;
  background: var(--sheet);
  padding: 14px 18px 16px;
  display: grid; gap: 10px;
}
.stepper .stories { display: flex; gap: 8px; flex-wrap: wrap; }
.stepper .stories button {
  font: 12.5px/1.2 system-ui, sans-serif;
  padding: 7px 13px;
  background: var(--paper); color: var(--ink-2);
  border: 1px solid var(--line-2); border-radius: 999px;
  cursor: pointer;
}
.stepper .stories button[aria-pressed="true"] {
  color: var(--ink); border-color: var(--signal); background: var(--signal-soft);
}
.stepper .playbar { display: flex; align-items: center; gap: 10px; min-height: 44px; }
.stepper .playbar button {
  font: 600 13px/1 ui-monospace, Menlo, monospace;
  width: 34px; height: 34px;
  background: var(--paper); color: var(--ink);
  border: 1px solid var(--line-2); border-radius: 6px;
  cursor: pointer;
}
.stepper .playbar button:disabled { opacity: 0.35; cursor: default; }
#story-caption { font-size: 13.5px; color: var(--ink-2); }
#story-caption b { color: var(--ink); }
#story-pos { font-size: 11px; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; margin-left: auto; }
/* spotlight: dim everything, raise the current step */
svg.storymode .sm { opacity: 0.16; transition: opacity 0.25s; }
svg.storymode .sm.spot { opacity: 1; }
svg.storymode .sm.trail { opacity: 0.55; }
svg.storymode .flow { display: none; }

/* ── Formula / example panels ────────────────────────────────── */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 20px; }
@media (max-width: 860px) { .duo { grid-template-columns: 1fr; } }
.panel { border: 1px solid var(--line-2); background: var(--sheet); padding: 20px 22px; }
.panel h3 { margin: 0 0 12px; font-size: 15px; }
.panel p { font-size: 13.5px; color: var(--ink-2); margin: 10px 0 0; }
.formula {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.9;
  overflow-x: auto;
  white-space: nowrap;
}
.formula b { color: var(--signal); font-weight: 650; }
.weights { display: flex; gap: 6px; margin-top: 12px; flex-wrap: wrap; }
.chip {
  font-size: 11.5px;
  border: 1px solid var(--line-2);
  background: var(--paper);
  padding: 4px 9px;
  border-radius: 3px;
  color: var(--ink-2);
}
.chip b { color: var(--ink); }
.chip.crit { border-color: color-mix(in srgb, var(--crit) 50%, transparent); background: var(--crit-soft); }
.chip.good { border-color: color-mix(in srgb, var(--good) 50%, transparent); background: var(--good-soft); }

table.run { width: 100%; border-collapse: collapse; font-size: 13px; font-variant-numeric: tabular-nums; }
table.run th, table.run td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--line); }
table.run th {
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600;
}
table.run td:first-child { color: var(--ink-2); }
.bar { display: inline-flex; align-items: center; gap: 8px; }
.bar i { display: inline-block; height: 8px; border-radius: 2px; background: var(--signal); opacity: 0.85; }
.bar.conf i { background: var(--good); }
.verdict-continue { color: var(--signal); font-weight: 600; font-size: 12px; }
.verdict-good { color: var(--good); font-weight: 650; font-size: 12px; }

/* ── In production ───────────────────────────────────────────── */
.scenarios { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.scenario-wide { grid-column: 1 / -1; }
@media (max-width: 860px) { .scenarios { grid-template-columns: 1fr; } .scenario-wide { grid-column: auto; } }
figure.scenario {
  margin: 0;
  border: 1px solid var(--line-2);
  background: var(--sheet);
  display: flex; flex-direction: column;
}
figure.scenario img {
  display: block; width: 100%; height: auto;
  border-bottom: 1px solid var(--line);
  background: #101318;
}
figure.scenario figcaption { padding: 14px 18px 16px; font-size: 13px; color: var(--ink-2); }
figure.scenario figcaption b { display: block; color: var(--ink); font-size: 14px; margin-bottom: 4px; }

/* ── Stop conditions ─────────────────────────────────────────── */
.stops { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 12px; }
.stop {
  border: 1px solid var(--line-2);
  border-top: 3px solid var(--crit);
  background: var(--sheet);
  padding: 14px 16px;
}
.stop .n { font-size: 10.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.stop h3 { margin: 2px 0 6px; font-size: 14.5px; }
.stop .sig { display: block; font-size: 11.5px; color: var(--crit); margin-bottom: 8px; }
.stop p { margin: 0; font-size: 12.5px; color: var(--ink-2); }
.stop.stop-ok { border-top-color: var(--good); }
.stop.stop-ok .sig { color: var(--good); }

/* ── Inventory ───────────────────────────────────────────────── */
.tablewrap { overflow-x: auto; border: 1px solid var(--line-2); background: var(--sheet); }
table.inv { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 860px; }
table.inv th, table.inv td {
  text-align: left; vertical-align: top;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
}
table.inv th {
  position: sticky; top: 0;
  background: var(--sheet);
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 600;
}
table.inv tr:last-child td { border-bottom: none; }
table.inv td { color: var(--ink-2); }
table.inv td.loopname { font-weight: 600; white-space: nowrap; color: var(--ink); }
table.inv td.cad { white-space: nowrap; color: var(--ink-2); font-variant-numeric: tabular-nums; }
table.inv .grp td {
  background: var(--paper);
  font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-3); font-weight: 650;
  padding: 6px 14px;
}

/* ── Observers ───────────────────────────────────────────────── */
.pyramid { display: grid; gap: 0; }
.tier {
  border: 1px solid var(--line-2);
  background: var(--sheet);
  padding: 16px 20px;
  display: grid; grid-template-columns: 170px 1fr; gap: 18px;
  margin-top: -1px;
}
.tier .who { font-size: 13px; font-weight: 650; }
.tier .who small { display: block; font-weight: 400; color: var(--ink-3); font-size: 11.5px; margin-top: 2px; }
.tier p { margin: 0; font-size: 13.5px; color: var(--ink-2); }
.tier p code { font-size: 12px; background: var(--paper); border: 1px solid var(--line); padding: 1px 5px; border-radius: 3px; }
.tier-meta { border-left: 3px solid var(--signal); }
.tier-human { border-left: 3px solid var(--warn); }
@media (max-width: 720px) { .tier { grid-template-columns: 1fr; gap: 6px; } }

.frontdoor {
  margin-top: 20px;
  border: 1px dashed var(--line-2);
  padding: 16px 20px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px;
  font-size: 13px; color: var(--ink-2);
  background: var(--sheet);
}
.frontdoor .step {
  border: 1px solid var(--line-2); background: var(--paper);
  padding: 5px 11px; border-radius: 3px; color: var(--ink);
  font-size: 12.5px;
}
.frontdoor .step.crit { border-color: var(--crit); background: var(--crit-soft); }
.frontdoor .step.warn { border-color: var(--warn); background: var(--warn-soft); }
.frontdoor .arr { color: var(--ink-3); }

/* ── Grounding ───────────────────────────────────────────────── */
.ground { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.ground .g { border: 1px solid var(--line-2); background: var(--sheet); padding: 14px 16px; }
.ground .g .k { font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.ground .g h3 { margin: 4px 0 6px; font-size: 14.5px; }
.ground .g p { margin: 0; font-size: 12.5px; color: var(--ink-2); }

blockquote.motto {
  margin: 40px 0 0;
  border-left: 3px solid var(--signal);
  padding: 6px 0 6px 20px;
  font-size: 17px;
  color: var(--ink);
  font-weight: 550;
  max-width: 56ch;
  text-wrap: balance;
}
blockquote.motto small { display: block; margin-top: 6px; font-size: 12.5px; color: var(--ink-3); font-weight: 400; }

footer {
  margin-top: 72px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
  font-size: 12.5px; color: var(--ink-3);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
}
footer a { color: var(--ink-2); }