/* ProbeArc site — one stylesheet, no build step.
   Tokens first; every color and size on the site derives from these.
   Panels are deep navy (the "v6" decision, 2026-08-26): dark boxes carry
   the content, the near-white page ground does the breathing. Chart colors
   on the navy surface are the validated dark-mode pair. */

:root {
  --paper: #f7f9fa;        /* page ground, cool near-white */
  --surface: #ffffff;      /* white surface: quiet bands, footer */
  --ink: #17222b;          /* primary text on light ground */
  --ink-2: #4a5a66;        /* secondary text on light ground */
  --line: #d8e0e5;         /* hairlines on light ground */
  --panel: #0a2540;        /* deep navy: nav, readout, cards, figures */
  --panel-line: #1d3d5f;   /* hairlines and borders on navy */
  --panel-ink: #c9d8e8;    /* body text on navy */
  --panel-muted: #93aec7;  /* secondary text on navy */
  --panel-link: #8fb8ff;   /* links and accents on navy */
  --signal: #14549e;       /* cobalt: links and buttons on light ground */
  --trace: #b54708;        /* amber on light ground (unused on navy) */
  --chart-up: #cd7f31;     /* price rises on navy, validated */
  --chart-down: #4d87e0;   /* price falls on navy, validated */
  --radius: 8px;
  --font-display: "Spectral", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-data: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0325rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 2px;
}

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

/* ---------- type scale ---------- */

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.3rem, 5.5vw, 3.6rem); }
h2 { font-size: clamp(1.55rem, 3vw, 2.1rem); margin-bottom: 0.6em; }
h3 { font-size: 1.22rem; margin-bottom: 0.35em; }
.lede { font-size: 1.16rem; color: var(--ink-2); max-width: 42em; }

.data, .readout, table { font-family: var(--font-data); font-variant-numeric: tabular-nums; }

/* ---------- nav (navy) ---------- */

.nav { border-bottom: 1px solid var(--panel-line); background: var(--panel); }
.nav .wrap { display: flex; align-items: baseline; gap: 28px; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap; }
.wordmark { font-family: var(--font-data); font-weight: 500; font-size: 1.28rem; color: #ffffff; letter-spacing: 0.01em; display: inline-flex; align-items: center; gap: 10px; }
.wordmark b { color: var(--panel-link); font-weight: 500; }
.wordmark svg { display: block; }
.wordmark:hover { text-decoration: none; }
.nav-links { display: flex; gap: 22px; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--panel-ink); font-size: 0.94rem; }
.nav-links a[aria-current="page"] { color: #ffffff; font-weight: 600; }
.nav a:focus-visible { outline-color: var(--panel-link); }

/* ---------- hero (light) ---------- */

.hero { padding: 84px 0 56px; }
.hero h1 { max-width: 13em; }
.hero .lede { margin-top: 20px; }
.cta-row { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block; padding: 11px 22px; border-radius: var(--radius);
  font-size: 0.97rem; font-weight: 600; border: 1px solid var(--signal);
}
.btn-primary { background: var(--signal); color: #fff; }
.btn-primary:hover { background: #103f77; border-color: #103f77; text-decoration: none; }
.btn-quiet { color: var(--signal); background: transparent; }
.btn-quiet:hover { background: #eef3f9; text-decoration: none; }

/* ---------- signature: the readout strip (navy) ---------- */

.readout {
  border-top: 1px solid var(--panel-line); border-bottom: 1px solid var(--panel-line);
  background: var(--panel); color: var(--panel-ink);
  overflow: hidden; position: relative;
}
.readout .wrap {
  display: flex; align-items: center; gap: 36px;
  padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap;
}
.readout-stats { display: flex; gap: 28px; flex-wrap: wrap; }
.readout-stat { font-size: 0.82rem; color: var(--panel-muted); white-space: nowrap; }
.readout-stat b { display: block; font-size: 1.18rem; font-weight: 500; color: #ffffff; }
.readout-trace { margin-left: auto; flex: 1 1 320px; max-width: 520px; }
.readout-trace svg { display: block; width: 100%; height: auto; }
.readout-caption { font-size: 0.72rem; color: var(--panel-muted); margin-top: 4px; }

/* one orchestrated moment: a scan line crosses the strip once on load */
.readout::after {
  content: ""; position: absolute; top: 0; bottom: 0; left: -3px; width: 2px;
  background: var(--panel-link); opacity: 0;
  animation: sweep 1.6s ease-out 0.4s 1;
}
@keyframes sweep {
  0% { left: 0; opacity: 0.55; }
  100% { left: 100%; opacity: 0; }
}

/* ---------- sections (light ground) ---------- */

.section { padding: 72px 0; }
.hero + .section, header.hero + section.section { padding-top: 4px; }
.section + .section { border-top: 1px solid var(--line); }
.section-quiet { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section .lede { margin-bottom: 8px; }
.prose { max-width: 44em; }
.prose p + p { margin-top: 1em; }

/* ---------- navy panels: cards, tiers, products, figures ---------- */

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; margin-top: 36px; }
.card {
  background: var(--panel); border: 1px solid var(--panel-line);
  border-radius: var(--radius); padding: 26px 24px; color: var(--panel-ink);
}
.card h3 { font-family: var(--font-body); font-size: 1.04rem; font-weight: 600; color: #ffffff; }
.card h3 .k { font-family: var(--font-data); font-weight: 500; color: var(--panel-link); }
.card p { color: var(--panel-ink); font-size: 0.95rem; margin-top: 8px; }
.card .more { display: inline-block; margin-top: 12px; font-size: 0.9rem; color: var(--panel-link); }
.card a:focus-visible { outline-color: var(--panel-link); }

.tiers { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; margin-top: 36px; }
.tier { background: var(--panel); border: 1px solid var(--panel-line); border-radius: var(--radius); padding: 28px 26px; display: flex; flex-direction: column; color: var(--panel-ink); }
.tier-tag { font-family: var(--font-data); font-size: 0.76rem; color: var(--panel-link); margin-bottom: 10px; }
.tier h3 { font-size: 1.35rem; color: #ffffff; }
.tier p { color: var(--panel-ink); font-size: 0.96rem; margin-top: 10px; }
.tier ul { margin: 14px 0 0 1.1em; color: var(--panel-ink); font-size: 0.94rem; }
.tier li { margin-top: 6px; }
.tier .btn { margin-top: auto; align-self: flex-start; margin-top: 22px; }
.tier .btn-primary { background: #ffffff; color: var(--panel); border-color: #ffffff; }
.tier .btn-primary:hover { background: var(--panel-ink); border-color: var(--panel-ink); }
.tier .btn-quiet { color: #ffffff; border-color: #ffffff; }
.tier .btn-quiet:hover { background: rgba(255, 255, 255, 0.12); }
.tier a:focus-visible { outline-color: var(--panel-link); }

.honesty { margin-top: 40px; font-size: 0.92rem; color: var(--ink-2); border-left: 3px solid var(--signal); padding-left: 16px; max-width: 40em; }

/* ---------- product blocks (navy) ---------- */

.product { background: var(--panel); border: 1px solid var(--panel-line); border-radius: var(--radius); padding: 32px 30px; margin-top: 24px; color: var(--panel-ink); }
.product:first-of-type { margin-top: 40px; }
.product h2 { color: #ffffff; }
.product h2 .k { font-family: var(--font-data); font-weight: 500; color: #ffffff; }
.product .role { color: var(--panel-muted); font-size: 1.02rem; font-style: italic; font-family: var(--font-display); }
.product .prose { margin-top: 14px; }
.product .prose p { color: var(--panel-ink); }
.product .prose a { color: var(--panel-link); }

/* ---------- charts and figures (navy) ---------- */

.figure { background: var(--panel); border: 1px solid var(--panel-line); border-radius: var(--radius); padding: 22px; margin-top: 28px; overflow-x: auto; color: var(--panel-ink); }
.figure h3 { font-family: var(--font-body); font-size: 0.98rem; font-weight: 600; color: #ffffff; }
.figure .sub { font-size: 0.85rem; color: var(--panel-muted); margin-bottom: 14px; }
.figure svg { display: block; max-width: 100%; height: auto; }
.fig-note { font-size: 0.8rem; color: var(--panel-muted); margin-top: 10px; }

.chart-label { font-family: var(--font-data); font-size: 12px; fill: var(--panel-muted); }
.chart-value { font-family: var(--font-data); font-size: 12px; fill: #f2f7fb; }

/* ---------- tables (navy) ---------- */

.table-scroll { overflow-x: auto; margin-top: 24px; border: 1px solid var(--panel-line); border-radius: var(--radius); background: transparent; }
.figure .table-scroll { border: none; margin-top: 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.8rem; color: var(--panel-ink); }
th, td { text-align: left; padding: 8px 11px; white-space: nowrap; }
th { font-weight: 500; color: var(--panel-muted); border-bottom: 1px solid var(--panel-line); font-size: 0.76rem; position: sticky; top: 0; background: var(--panel); }
td { border-bottom: 1px solid var(--panel-line); }
tr:last-child td { border-bottom: none; }
td.num, th.num { text-align: right; }
.up { color: var(--chart-up); }
.down { color: var(--chart-down); }

/* ---------- footer (light) ---------- */

footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 72px; }
footer .wrap { padding-top: 34px; padding-bottom: 40px; display: flex; gap: 32px; flex-wrap: wrap; align-items: baseline; }
footer .wordmark { font-size: 0.96rem; color: var(--ink); }
footer .wordmark b { color: var(--signal); }
.foot-links { display: flex; gap: 20px; flex-wrap: wrap; margin-left: auto; }
.foot-links a { color: var(--ink-2); font-size: 0.88rem; }
.foot-line { width: 100%; font-size: 0.82rem; color: var(--ink-2); }

/* ---------- small screens ---------- */

@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .section { padding: 52px 0; }
  .readout-trace { margin-left: 0; }
  .nav-links { gap: 16px; }
}