/* Signal Box — Swiss/International style: light, gridded, type-led. */

:root {
  --paper: #fbfbf9;
  --ink: #1f1f1d;
  --muted: #8a8a84;
  --hairline: #e3e3df;
  --safe: #2e7d32;
  --danger: #d64545;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

header h1 {
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 0.25rem;
}

.subtitle {
  color: var(--muted);
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
}

h2 {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0 0 0.5rem;
}

.caption { color: var(--muted); font-size: 0.85rem; margin: 0 0 1rem; }

/* rung tabs */
.rungs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 1.5rem;
}

.rung {
  background: none;
  border: none;
  border-right: 1px solid var(--hairline);
  padding: 0.8rem 1rem;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.rung:last-child { border-right: none; }
.rung:hover { background: #f1f1ed; }
.rung.active { background: var(--ink); color: var(--paper); }

.rung-name { display: block; font-weight: 700; font-size: 1.1rem; }
.rung-technique { display: block; font-size: 0.78rem; color: var(--muted); }
.rung.active .rung-technique { color: #c9c9c4; }

/* stats strip */
.stats {
  display: flex;
  gap: 2.5rem;
  align-items: baseline;
  padding: 0.5rem 0 1.5rem;
  flex-wrap: wrap;
}

.stat-label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.space-note { color: var(--muted); font-size: 0.8rem; margin-left: auto; }

/* panes */
.panes {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  margin-bottom: 2.5rem;
}

#junction { width: 100%; }
#junction svg { width: 100%; height: auto; display: block; }

.verdict-ok { color: var(--safe); font-weight: 600; }

.verdict-bad {
  color: var(--danger);
  margin: 0.5rem 0 0;
  padding-left: 1.2rem;
  font-size: 0.9rem;
}

.gallery-buttons { display: flex; flex-direction: column; gap: 0.5rem; }

.example {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  background: none;
  border: 1px solid var(--hairline);
  padding: 0.55rem 0.8rem;
  font: inherit;
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
}

.example:hover { border-color: var(--ink); }
.example-count { color: var(--muted); font-variant-numeric: tabular-nums; }
.example.legal { color: var(--safe); border-color: var(--safe); }

/* state grid */
.grid-pane {
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
  margin-bottom: 2.5rem;
}

#state-grid svg { width: min(560px, 100%); height: auto; display: block; }

.legend { display: flex; gap: 1.4rem; flex-wrap: wrap; margin-top: 0.8rem; font-size: 0.8rem; color: var(--muted); }
.legend-item { display: inline-flex; align-items: center; gap: 0.4rem; }
.swatch { width: 11px; height: 11px; border-radius: 2px; display: inline-block; }

/* extinction matrix */
.extinction {
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
}

.extinction table {
  border-collapse: collapse;
  width: 100%;
  font-variant-numeric: tabular-nums;
}

.extinction th, .extinction td {
  text-align: right;
  padding: 0.45rem 0.8rem;
  border-bottom: 1px solid var(--hairline);
  font-size: 0.88rem;
}

.extinction th { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.extinction .family { text-align: left; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 2px solid var(--ink);
  color: var(--muted);
  font-size: 0.85rem;
}

/* site nav (legacy back/forward style) */
.site-nav { display: flex; justify-content: space-between; font-size: 0.85rem; margin-bottom: 2rem; }
.site-nav a { color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--hairline); }
.site-nav a:hover { color: var(--ink); border-color: var(--ink); }

/* four-page banner nav */
.page-nav {
  border-top: 2px solid var(--ink);
  display: flex;
  gap: 0;
  margin-bottom: 2rem;
  padding-top: 0;
}
.page-nav a,
.page-nav span {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.6rem 1.4rem;
  border-right: 1px solid var(--hairline);
  color: var(--muted);
  white-space: nowrap;
}
.page-nav a:last-child,
.page-nav span:last-child {
  border-right: none;
}
.page-nav a:hover { color: var(--ink); }
.page-nav .page-nav-current {
  color: var(--ink);
  font-weight: 700;
  background: var(--ink);
  color: var(--paper);
  border-right-color: var(--ink);
}

/* code pane */
.code-pane { border-top: 1px solid var(--hairline); padding-top: 1.2rem; margin-bottom: 2rem; }
.code-pane > pre, .landing pre {
  background: #f1f1ed;
  border-left: 3px solid var(--ink);
  padding: 1rem 1.2rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.55;
}
code { font-family: "SF Mono", ui-monospace, Menlo, monospace; }

/* landing */
.kicker { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.8rem; }
.landing h1 { font-size: 2.4rem; letter-spacing: 0.02em; text-transform: none; line-height: 1.15; max-width: 18em; }
.landing .stp { border-top: 1px solid var(--hairline); padding-top: 1.5rem; margin-bottom: 2.5rem; max-width: 44rem; }
.landing .stp h2 { color: var(--ink); }
.landing p { max-width: 44rem; }

.big-numbers { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin: 1.8rem 0; }
.big-number .n { display: block; font-size: 2rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.big-number .l { display: block; font-size: 0.78rem; color: var(--muted); }
.n.grey { color: #b0b0ab; } .n.red { color: var(--danger); } .n.green { color: var(--safe); }

.proportion { margin: 2rem 0; }
.proportion-bar { display: flex; height: 34px; border: 1px solid var(--hairline); }
.p-malformed { background: #d9d9d4; }
.p-unsafe { background: var(--danger); }
.p-safe { background: var(--safe); }
.proportion figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 0.5rem; max-width: 44rem; }

.ladder-preview { border-collapse: collapse; margin: 1.4rem 0; }
.ladder-preview td { padding: 0.5rem 1.2rem 0.5rem 0; border-bottom: 1px solid var(--hairline); font-size: 0.9rem; }
.ladder-preview .rname { font-weight: 700; }
.ladder-preview .kill { color: var(--muted); }

.cta-row { margin-top: 2rem; }
.cta {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  padding: 0.8rem 1.6rem;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.cta:hover { background: #000; }

/* payoff */
.payoff-page h1 { text-transform: none; letter-spacing: 0.02em; }
.payoff-page p { max-width: 46rem; }
.payoff table { border-collapse: collapse; width: 100%; margin: 1.5rem 0 0.5rem; }
.payoff th, .payoff td { text-align: left; padding: 0.55rem 0.9rem 0.55rem 0; border-bottom: 1px solid var(--hairline); font-size: 0.85rem; }
.payoff th { font-size: 0.7rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.payoff .rt { font-weight: 700; white-space: nowrap; }
.payoff .how { color: var(--muted); font-family: "SF Mono", ui-monospace, Menlo, monospace; font-size: 0.75rem; }
.payoff .sha { font-family: "SF Mono", ui-monospace, Menlo, monospace; font-size: 0.72rem; word-break: break-all; }
.payoff .match { font-size: 1.1rem; color: var(--safe); }
.payoff .coming td { color: #c2c2bc; }
.payoff-verdict { font-weight: 700; font-size: 1.05rem; }
.payoff-verdict.ok { color: var(--safe); }
.payoff-verdict.bad { color: var(--danger); }
.aside { color: var(--muted); font-size: 0.85rem; }

/* four-page structure */
.hero { margin: 0 0 2.5rem; }
.hero img { width: 100%; max-height: 520px; object-fit: cover; object-position: center 30%; display: block; filter: grayscale(0.15); }
.hero figcaption { font-size: 0.78rem; color: var(--muted); margin-top: 0.4rem; }

.owt-banner {
  font-size: 3rem;
  line-height: 1.05;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  margin: 2.5rem 0;
  padding: 2rem 1rem;
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.landing header p { max-width: 44rem; }

.junction-fig { margin: 1.5rem 0; }
.junction-fig svg { width: 100%; height: auto; display: block; }
.junction-fig figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 0.3rem; }
.figs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.figs .junction-fig { margin: 0; }

/* failure-mode figures: stacked full-width for clarity */
.figs-stacked { display: flex; flex-direction: column; gap: 2.5rem; margin: 1.5rem 0; }
.figs-stacked .junction-fig { margin: 0; max-width: 44rem; }

/* small-multiples strip on results page */
.small-multiples-lead { margin: 0 0 1rem; color: var(--muted); font-size: 0.88rem; max-width: 44rem; }
.small-multiples {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin: 0 0 2.5rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.5rem;
}
.sm-fig { margin: 0; }
.sm-fig div { width: 100%; }
.sm-fig svg { width: 100%; height: auto; display: block; }
.sm-fig figcaption { font-size: 0.72rem; color: var(--muted); margin-top: 0.4rem; line-height: 1.3; }

@media (max-width: 860px) {
  .small-multiples { grid-template-columns: repeat(3, 1fr); }
  .small-multiples .sm-fig:nth-child(4),
  .small-multiples .sm-fig:nth-child(5) { grid-column: span 1; }
}

.domain-key { max-width: 44rem; padding-left: 1.2rem; }
.domain-key li { margin-bottom: 0.5rem; }
.domain-legend { margin: 1rem 0 1.5rem; }

.key-collision { color: #9e4f9e; font-weight: 600; }
.key-conflict { color: var(--danger); font-weight: 600; }
.key-derailment { color: #e09f3e; font-weight: 600; }
.key-occupied { color: #5b7db1; font-weight: 600; }

.v0-widget { border: 1px solid var(--hairline); padding: 1.5rem; margin: 1.5rem 0; }
.v0-widget .panes { border-top: none; padding-top: 0; }
.v0-widget .grid-pane { border-top: 1px solid var(--hairline); margin-bottom: 0; }

.rungs-four { grid-template-columns: repeat(4, 1fr); }

/* evaluation page */
.eval-page h1 { text-transform: none; letter-spacing: 0.02em; }
.eval-hero table { border-collapse: collapse; width: 100%; margin: 1rem 0 2.5rem; font-variant-numeric: tabular-nums; }
.eval-hero th, .eval-hero td { text-align: right; padding: 0.9rem 1rem; border-bottom: 1px solid var(--hairline); font-size: 1.05rem; }
.eval-hero th { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.eval-hero .family { text-align: left; }
.eval-hero .rname { font-weight: 700; font-size: 1.2rem; display: block; }
.eval-hero .rtech { font-size: 0.75rem; color: var(--muted); display: block; }
.eval-hero .extinct { color: #c2c2bc; }
.eval-contraction table { border-collapse: collapse; width: 100%; font-variant-numeric: tabular-nums; }
.eval-contraction th, .eval-contraction td { text-align: right; padding: 0.45rem 0.8rem; border-bottom: 1px solid var(--hairline); font-size: 0.88rem; }
.eval-contraction th { font-size: 0.7rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.eval-contraction .rname, .eval-contraction .rtech { text-align: left; }

.runtime-list { columns: 2; max-width: 30rem; padding-left: 1.2rem; }
.runtime-list li { margin-bottom: 0.3rem; }

/* ── landing hero (full-bleed two-column) ── */
.landing-hero {
  display: flex;
  min-height: 92vh;
  width: 100%;
  overflow: hidden;
}

.hero-text {
  flex: 0 0 48%;
  max-width: 48%;
  padding: 3.5rem 2.5rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  box-sizing: border-box;
}

.hero-text p {
  font-size: 1.35rem;
  line-height: 1.55;
  margin: 0 0 1.6rem;
  max-width: none;
}

.hero-slogan {
  margin-top: auto;
  border: 2px solid var(--ink);
  padding: 0.65rem 1rem;
  display: block;
}

.hero-slogan h1 {
  font-size: clamp(0.95rem, 1.75vw, 1.55rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0;
  white-space: nowrap;
  line-height: 1.1;
}

.hero-photo {
  flex: 0 0 52%;
  max-width: 52%;
  position: relative;
  overflow: hidden;
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
}

.hero-photo figcaption {
  position: absolute;
  bottom: 0.6rem;
  right: 0.8rem;
  font-size: 0.7rem;
  color: rgba(255,255,255,0.88);
  text-shadow: 0 1px 3px rgba(0,0,0,0.75);
  max-width: 24em;
  text-align: right;
}

@media (max-width: 860px) {
  .landing-hero {
    flex-direction: column;
    min-height: auto;
  }
  .hero-text,
  .hero-photo {
    flex: none;
    max-width: 100%;
    width: 100%;
  }
  .hero-text {
    padding: 2rem 1.5rem;
  }
  .hero-photo {
    height: 50vh;
  }
  .hero-slogan h1 {
    white-space: normal;
    font-size: clamp(1rem, 5vw, 1.4rem);
  }
}

/* landing two-column top (legacy — keep harmless) */
.landing-top { display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem; align-items: start; margin-bottom: 1rem; }
.landing-top-text p { font-size: 1.15rem; max-width: none; }
.landing-top .hero { margin: 0; }
.landing-top .hero img { max-height: 440px; object-fit: cover; object-position: center 25%; }

/* evaluation stacked bars */
.vbars { margin: 1.5rem 0 2.5rem; }
.vbar-row {
  display: grid;
  grid-template-columns: 170px 1fr 90px;
  gap: 0 1.2rem;
  align-items: center;
  padding: 0.9rem 0 0.5rem;
  border-bottom: 1px solid var(--hairline);
}
.vbar-label .rname { font-weight: 700; font-size: 1.15rem; display: block; }
.vbar-label .rtech { font-size: 0.75rem; color: var(--muted); display: block; }
.vbar-track { display: flex; align-items: center; height: 34px; }
.vbar-seg { height: 34px; flex-shrink: 0; }
.vbar-coverage { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }
.vbar-note { grid-column: 2 / 4; margin: 0.35rem 0 0; font-size: 0.75rem; color: var(--muted); }
.vbars-legend { margin-top: 1.2rem; }