/* ──────────────────────────────────────────────────────────────
   SAE Metric — editorial paper page (Distill-flavored)
   ────────────────────────────────────────────────────────────── */

:root {
  /* tweakables (Tweaks panel writes back through __edit_mode_set_keys) */
  --serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", Georgia, serif;
  --bincell: 22px;
  --sans:  "Inter Tight", "Söhne", -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --mono:  "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --ink:        #1a1a1f;
  --ink-2:      #3b3b44;
  --ink-3:      #65656f;
  --rule:       #d9d6d0;
  --rule-soft:  #ecebe6;
  --paper:      #f9f9f7;
  --paper-2:    #f0ede4;
  --card:       #ffffff;

  --accent:     #CA8A04;          /* indigo violet, cool */
  --accent-2:   rgba(202, 138, 4, 0.18);          /* tint */
  --accent-ink: #78540a;

  --pos: #2d8a5a;                 /* trained / pass */
  --neg: #b53a3a;                 /* fail / remove */
  --neu: #b08742;                 /* random / neutral */

  --gap: 24px;
  --rad: 4px;
  --measure: 680px;
  --density: 1;                   /* tweak: line-height/spacing scale */

  --shadow-1: 0 1px 0 rgba(0,0,0,.03), 0 1px 2px rgba(0,0,0,.04);
  --shadow-2: 0 1px 0 rgba(0,0,0,.04), 0 8px 24px rgba(20,20,30,.06);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; overflow-x: hidden; }
body {
  font-family: var(--serif);
  font-size: 19px;
  line-height: calc(1.65 * var(--density));
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Selection */
::selection { background: var(--accent); color: #fff; }

/* ── Layout grid ─────────────────────────────────────────────── */
.page { max-width: 1180px; margin: 0 auto; padding: 0 32px; }
.measure { max-width: var(--measure); margin-left: auto; margin-right: auto; }
.wide  { max-width: 980px; margin-left: auto; margin-right: auto; }
.full  { max-width: 1180px; margin-left: auto; margin-right: auto; }
section { padding: calc(52px * var(--density)) 0; border-top: 1px solid var(--rule-soft); }
section:first-of-type { border-top: 0; }

/* ── Typography ──────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.012em;
  color: var(--ink);
  text-wrap: balance;
}
h1 { font-size: 64px; line-height: 1.04; margin: 0 0 24px; letter-spacing: -0.025em; }
h2 { font-size: 36px; line-height: 1.12; margin: 0 0 16px; letter-spacing: -0.018em; }
h3 { font-size: 22px; line-height: 1.25; margin: 0 0 12px; }
h4 { font-size: 14px; font-family: var(--sans); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-3); margin: 0 0 8px; font-weight: 500; }
p { margin: 0 0 1em; text-wrap: pretty; }
em { font-style: italic; }
strong { font-weight: 600; }
small, .small { font-size: 14px; color: var(--ink-3); }
.kicker {
  font-family: var(--sans);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent-ink);
  font-weight: 500;
  margin: 0 0 18px;
  display: inline-flex; align-items: center; gap: 10px;
}
.kicker::before {
  content: ""; display: inline-block; width: 24px; height: 1.5px; background: var(--accent);
}
.mono { font-family: var(--mono); font-size: 0.85em; }
.dim { color: var(--ink-3); }

a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

/* ── Inline annotations / sidenotes ─────────────────────────── */
.sidenote {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.45;
  color: var(--ink-3);
}
.figcaption {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-3);
  margin-top: 12px;
}

/* ── Header / nav ────────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule-soft);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 32px; max-width: 1180px; margin: 0 auto;
  font-family: var(--sans); font-size: 13px;
}
.topbar nav { display: flex; gap: 22px; }
.topbar nav a { color: var(--ink-2); text-decoration: none; }
.topbar nav a:hover { color: var(--accent); }
.brand { font-family: var(--mono); font-size: 12px; letter-spacing: 0.1em; color: var(--ink-3); }

/* ── Hero ────────────────────────────────────────────────────── */
.hero { padding-top: 56px; padding-bottom: 36px; border-top: 0; }
.hero h1 .accent { color: var(--accent); font-style: italic; }
.byline {
  font-family: var(--sans); font-size: 14px; color: var(--ink-3);
  display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
  margin: 28px 0 0;
}
.byline .chip {
  border: 1px solid var(--rule); border-radius: 999px;
  padding: 4px 12px; font-size: 12px; color: var(--ink-2);
  background: var(--card);
}
.byline a.chip { text-decoration: none; }
.byline a.chip:hover { border-color: var(--accent); color: var(--accent); }

/* ── Cards / panels ──────────────────────────────────────────── */
.panel {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  box-shadow: var(--shadow-1);
}
.panel-pad { padding: 28px 28px; }
.panel-hd  {
  padding: 16px 24px; border-bottom: 1px solid var(--rule-soft);
  display: flex; align-items: center; justify-content: space-between;
  font-family: var(--sans); font-size: 13px; color: var(--ink-2);
}

/* ── Buttons / controls ──────────────────────────────────────── */
.btn {
  font-family: var(--sans);
  font-size: 13px; font-weight: 500;
  padding: 8px 14px;
  border: 1px solid var(--rule);
  background: var(--card);
  color: var(--ink);
  border-radius: var(--rad);
  cursor: pointer;
  transition: all .12s ease;
}
.btn:hover { border-color: var(--ink-3); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); }
.btn.ghost { background: transparent; border-color: var(--rule); }
.btn.tiny { font-size: 11px; padding: 4px 8px; }

.seg {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  background: var(--card);
  overflow: hidden;
}
.seg button {
  font-family: var(--sans); font-size: 12px;
  padding: 6px 12px;
  background: transparent; border: 0; cursor: pointer;
  color: var(--ink-2);
  border-right: 1px solid var(--rule-soft);
}
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--ink); color: #fff; }

.sel {
  font-family: var(--sans); font-size: 12px;
  padding: 6px 28px 6px 10px;
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  background: var(--card) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%2365656f' stroke-width='1.4' fill='none' stroke-linecap='round'/></svg>") no-repeat right 8px center;
  appearance: none;
  color: var(--ink);
}

.label {
  font-family: var(--sans); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--ink-3);
  display: block; margin-bottom: 4px;
}

/* ── Binary cell grid (used by FBMP + TAPAS) ─────────────────── */
.bingrid { display: grid; grid-auto-flow: column; gap: 3px; }
.bincell {
  width: var(--bincell); height: var(--bincell);
  border: 1px solid var(--rule);
  background: var(--card);
  border-radius: 2px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 11px; color: var(--ink-3);
  transition: all .25s ease;
}
.bincell.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.bincell.tp { background: var(--pos); border-color: var(--pos); color: #fff; }
.bincell.fp { background: #f3d4d4; border-color: var(--neg); color: var(--neg); }
.bincell.fn { background: #fdf6e3; border-color: var(--neu); color: var(--neu); }

/* ── Tag pills ──────────────────────────────────────────────── */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--sans); font-size: 11px;
  padding: 3px 8px; border-radius: 999px;
  background: var(--paper-2); color: var(--ink-2);
  border: 1px solid var(--rule-soft);
}
.tag.pos { color: var(--pos); border-color: color-mix(in oklab, var(--pos) 30%, var(--rule)); }
.tag.neg { color: var(--neg); border-color: color-mix(in oklab, var(--neg) 30%, var(--rule)); }
.tag.warn { color: var(--neu); border-color: color-mix(in oklab, var(--neu) 30%, var(--rule)); }
.tag.accent { color: var(--accent-ink); background: var(--accent-2); border-color: var(--accent-2); }

/* ── Placeholder image slot ─────────────────────────────────── */
.imgslot {
  width: 100%; aspect-ratio: 1/1;
  background:
    repeating-linear-gradient(
      45deg,
      var(--paper-2) 0 8px,
      var(--card) 8px 16px
    );
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  position: relative;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden;
}
.imgslot img { width: 100%; height: 100%; object-fit: cover; display: block; }
.imgslot .ph {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  font-family: var(--mono); font-size: 11px; color: var(--ink-3);
  padding: 12px;
  pointer-events: none;
}
.imgslot[data-loaded="true"] .ph { display: none; }

/* ── Footer ─────────────────────────────────────────────────── */
footer.foot {
  border-top: 1px solid var(--rule);
  padding: 60px 0 80px;
  color: var(--ink-3);
  font-family: var(--sans); font-size: 13px;
}
footer.foot .page { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }

/* ── Hero animation stage ───────────────────────────────────── */
.hero-stage {
  position: relative;
  margin-top: 48px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--rad);
  overflow: hidden;
  min-height: 520px;
  box-shadow: var(--shadow-2);
}
.hero-track {
  position: sticky; top: 70px; height: 100vh;
}

/* ── Stage chips for scrolly ────────────────────────────────── */
.stage-chip {
  position: absolute; top: 16px; right: 16px;
  font-family: var(--mono); font-size: 11px; color: var(--ink-3);
  letter-spacing: 0.08em;
}

/* ── Utility ────────────────────────────────────────────────── */
.row { display: flex; gap: var(--gap); align-items: stretch; }
.col { display: flex; flex-direction: column; gap: var(--gap); }
.between { display: flex; justify-content: space-between; align-items: center; }
.center { display: flex; align-items: center; justify-content: center; }
.gap-sm { gap: 10px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 32px; }
.mt-0 { margin-top: 0; } .mt-1 { margin-top: 12px; } .mt-2 { margin-top: 24px; } .mt-3 { margin-top: 40px; } .mt-4 { margin-top: 64px; }
.mb-0 { margin-bottom: 0; } .mb-1 { margin-bottom: 12px; } .mb-2 { margin-bottom: 24px; } .mb-3 { margin-bottom: 40px; }

/* responsive */
@media (max-width: 900px) {
  body { font-size: 17px; }
  h1 { font-size: 44px; }
  h2 { font-size: 28px; }
  .page { padding: 0 20px; }
  section { padding: 60px 0; }
  .row { flex-direction: column; }
}

/* ── Component layout defaults (overridden at mobile breakpoints) ── */
.hero-stage-inner { padding: 28px 32px 40px; }
.binrow-label     { min-width: 160px; }
.seg button.lg    { padding: 10px 18px; }
.fbmp-grid        { display: grid; grid-template-columns: 1fr 280px; }
.dashboard-grid   { display: grid; grid-template-columns: 1fr 200px; }
.tapas-main-grid            { display: grid; grid-template-columns: 1fr 1fr 240px; }
.tapas-main-grid.tapas-coco { grid-template-columns: 1fr 1fr 200px; }
.tapas-delta-grid            { display: grid; grid-template-columns: 1fr 1fr 1fr; }
.tapas-delta-grid.tapas-coco { grid-template-columns: 1fr 1fr; }
.tapas-footer-2col { display: grid; grid-template-columns: 1fr 1fr; }
.tapas-footer-3col { display: grid; grid-template-columns: 1fr 1fr 1fr; }

/* ── Mobile: 640px and below ─────────────────────────────────── */
@media (max-width: 640px) {
  :root { --bincell: 18px; }
  body { font-size: 16px; }
  h1 { font-size: 32px; }
  h2 { font-size: 24px; }
  .page { padding: 0 16px; }
  section { padding: calc(36px * var(--density)) 0; }
  .topbar-inner { padding: 12px 16px; }
  .topbar nav { display: none; }
  .hero-stage-inner { padding: 16px 14px 24px; }
  .seg button { padding: 6px 8px; font-size: 11px; }
  .bincell { font-size: 10px; }
  .binrow-label { min-width: 80px; }
  .fbmp-grid { grid-template-columns: 1fr; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .tapas-main-grid,
  .tapas-main-grid.tapas-coco { grid-template-columns: 1fr 1fr; }
  .tapas-sidebar { grid-column: 1 / -1; }
  .tapas-delta-grid { grid-template-columns: 1fr 1fr; }
  .tapas-footer-3col,
  .tapas-footer-2col { grid-template-columns: 1fr; }
  .panel-pad { padding: 16px 14px; }
  .panel-hd  { padding: 12px 14px; flex-wrap: wrap; gap: 8px; }
}

/* ── Very small phones: 480px and below ─────────────────────────── */
@media (max-width: 480px) {
  .tapas-main-grid,
  .tapas-main-grid.tapas-coco { grid-template-columns: 1fr; }
  .tapas-delta-grid,
  .tapas-delta-grid.tapas-coco { grid-template-columns: 1fr; }
}