/* SaborData | Stats & ML - landing page
   System fonts only: no external requests, so no cookie/GDPR font-loading issue. */

:root {
  --paper: #F5F7FA;
  --grid: #E4EAF1;
  --surface: #FFFFFF;
  --ink: #0F1B2D;
  --muted: #51627A;
  --line: #D3DCE6;
  --dot: #B9C4D1;
  --real: #0B7A6E;
  --myth: #C0352A;
  --btn: #0F1B2D;
  --btn-ink: #FFFFFF;
  --focus: #14B8A6;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0C1522;
    --grid: #14212F;
    --surface: #121E2D;
    --ink: #E8EEF5;
    --muted: #9AAABD;
    --line: #243447;
    --dot: #3A4C61;
    --real: #3DD6C3;
    --myth: #FF7A6E;
    --btn: #E8EEF5;
    --btn-ink: #0C1522;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font);
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--real); text-underline-offset: 0.18em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

.wrap { width: min(1080px, 100% - 40px); margin-inline: auto; }

/* ---------- stage: header + hero on graph paper ---------- */
.stage { position: relative; }
.stage::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  -webkit-mask-image: linear-gradient(#000 40%, transparent);
  mask-image: linear-gradient(#000 40%, transparent);
}

.top { padding-top: 22px; }
.brand { font-weight: 800; font-size: 1.05rem; letter-spacing: -0.01em; text-decoration: none; color: var(--ink); }
.brand-sub { font-weight: 500; color: var(--muted); }

.hero { display: grid; gap: 44px; padding: 40px 0 72px; }
@media (min-width: 900px) {
  .hero { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: 64px; align-items: start; padding: 72px 0 96px; }
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(2.15rem, 6.4vw, 3.75rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 800;
  text-wrap: balance;
}
.lead { margin: 0 0 28px; max-width: 34rem; font-size: 1.2rem; color: var(--muted); }

/* ---------- signup ---------- */
.signup { max-width: 30rem; scroll-margin-top: 24px; }
.signup label { display: block; margin-bottom: 8px; font-weight: 600; font-size: 0.95rem; }
.field { display: flex; flex-wrap: wrap; gap: 10px; }
.field input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 14px 16px;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 10px;
}
.field input::placeholder { color: var(--muted); opacity: 0.8; }
.btn {
  display: inline-block;
  flex: 0 0 auto;
  padding: 14px 20px;
  font: inherit;
  font-weight: 700;
  line-height: 1.4;
  text-decoration: none;
  color: var(--btn-ink);
  background: var(--btn);
  border: 0;
  border-radius: 10px;
  cursor: pointer;
}
.btn:hover { opacity: 0.88; }
.fine { margin: 12px 0 0; font-size: 0.875rem; color: var(--muted); }

/* ---------- demo: the accuracy paradox ---------- */
.demo { background: var(--surface); border: 1.5px solid var(--line); border-radius: 14px; padding: 24px; }
.demo-title { margin: 0 0 6px; font-size: 1.25rem; line-height: 1.25; letter-spacing: -0.01em; }
.demo-lead { margin: 0 0 18px; color: var(--muted); }

.dots {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: clamp(6px, 1.8vw, 10px);
  max-width: 380px;
  margin: 0 0 20px;
  padding: 4px;
}
.dot {
  aspect-ratio: 1;
  border-radius: 50%;
  background-color: var(--dot);
  transition: box-shadow 0.3s ease, background-color 0.3s ease;
  transition-delay: calc(var(--i) * 7ms);
}
.dot.pos { background-color: var(--myth); }
.dots.ran .dot { background-color: transparent; box-shadow: inset 0 0 0 2px var(--real); }
.dots.ran .dot.pos { background-color: var(--myth); box-shadow: 0 0 0 3px var(--surface), 0 0 0 5px var(--myth); }

.demo-btn { margin-bottom: 20px; }

.readout { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 0 0 14px; }
.readout div { border-top: 2px solid var(--line); padding-top: 8px; }
.readout dt { font-size: 0.875rem; color: var(--muted); }
.readout dd { margin: 0; font-size: 1.9rem; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.demo.ran .acc { color: var(--real); }
.demo.ran .found { color: var(--myth); }
.caption { margin: 0; font-size: 0.95rem; color: var(--muted); }

/* ---------- content bands ---------- */
.band { padding: 72px 0; border-top: 1.5px solid var(--line); }
.split { display: grid; gap: 40px; }
@media (min-width: 900px) {
  .split { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 72px; align-items: start; }
}
.sec-title { margin: 0 0 12px; font-size: clamp(1.6rem, 4vw, 2.25rem); line-height: 1.1; letter-spacing: -0.025em; }
.sec-text { margin: 0; max-width: 36rem; color: var(--muted); }

.preview { margin: 0; max-width: 420px; }
.preview img { border: 1.5px solid var(--line); border-radius: 6px; background: #fff; }
.preview figcaption { margin-top: 10px; font-size: 0.875rem; color: var(--muted); }

.myths { list-style: none; margin: 26px 0; padding: 0; display: grid; gap: 12px; }
.myths li {
  font-size: 1.1rem;
  line-height: 1.35;
  font-weight: 600;
  text-decoration-line: line-through;
  text-decoration-color: var(--myth);
  text-decoration-thickness: 2px;
}
.after-list { margin: 0 0 26px; max-width: 36rem; color: var(--muted); }

.about { max-width: 40rem; }

/* ---------- footer ---------- */
.foot { padding: 28px 0 40px; border-top: 1.5px solid var(--line); font-size: 0.875rem; color: var(--muted); }
.foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.foot nav { display: flex; gap: 20px; }
.foot a { color: var(--muted); }

/* ---------- thanks page ---------- */
.thanks { padding: 56px 0 96px; max-width: 38rem; }
.thanks .lead { margin-bottom: 24px; }
.thanks-links { display: flex; flex-wrap: wrap; gap: 14px 22px; align-items: center; margin-top: 28px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dot { transition: none; }
}