/*
 * Landing page for https://caloview.com/.
 *
 * Deliberately hand-written and dependency-free: this page is deployed as-is,
 * with no build step, so it must stay readable as source. Colours are the
 * application's own, from app/src/styles.css and app/src/temperature-scale.ts,
 * so the page and the simulator read as one product.
 */

:root {
  --ink: #17202b;
  --ink-soft: #53606f;
  --ink-faint: #657181;
  --surface: #ffffff;
  --surface-sunk: #eef1f4;
  --page: #d9dee5;
  --dark: #111923;
  --dark-edge: #293442;
  --accent: #1677a8;
  --warm: #f57c00;
  --hot: #e31a1c;
  --rule: #b9c1cb;
  --measure: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font:
    16px/1.6 system-ui,
    sans-serif;
  -webkit-text-size-adjust: 100%;
}

h1,
h2,
h3 {
  line-height: 1.2;
  text-wrap: balance;
}

a {
  color: var(--accent);
}

/* ---------------------------------------------------------------- masthead */

.masthead {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 52px;
  color: #f7f7f7;
  background: var(--dark);
  border-bottom: 1px solid var(--dark-edge);
}

.wordmark {
  color: #f7f7f7;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.masthead-cta {
  color: #cfe4f0;
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.masthead-cta:hover {
  color: #fff;
}

/* -------------------------------------------------------------------- hero */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 48px;
  align-items: center;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 64px 24px 56px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--warm);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 4.4vw, 46px);
  letter-spacing: -0.015em;
}

.lede {
  margin: 0 0 28px;
  max-width: 46ch;
  color: var(--ink-soft);
  font-size: 17px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

.button {
  display: inline-block;
  padding: 11px 20px;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  border-color: #8f9aa7;
}

.button.primary {
  color: #fff;
  background: var(--accent);
  border-color: #12648d;
}

.button.primary:hover {
  background: #12648d;
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: 0 2px 14px rgb(17 25 35 / 14%);
}

/* ------------------------------------------------------------------- bands */

.band {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 44px 24px;
  border-top: 1px solid var(--rule);
}

.band h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.6vw, 28px);
}

.section-lede {
  margin: 0 0 28px;
  max-width: 62ch;
  color: var(--ink-soft);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cards li {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.cards h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.cards p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14.5px;
}

/* ------------------------------------------------------------ model scope */

.model-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.model-column {
  padding: 20px 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
  border-radius: 8px;
}

.model-column.warn {
  border-top-color: var(--hot);
}

.model-column h3 {
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.model-column ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 14.5px;
}

.model-column li + li {
  margin-top: 7px;
}

.accuracy {
  margin: 24px 0 0;
  max-width: 70ch;
  padding: 16px 18px;
  color: var(--ink-soft);
  background: var(--surface-sunk);
  border-left: 3px solid var(--warm);
  border-radius: 0 6px 6px 0;
}

.accuracy strong {
  color: var(--ink);
}

.plain {
  margin: 0;
  padding-left: 20px;
  max-width: 68ch;
  color: var(--ink-soft);
}

.plain li + li {
  margin-top: 9px;
}

/* ---------------------------------------------------------------- feedback */

.feedback-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.feedback-grid h3 {
  margin: 0 0 10px;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.feedback-grid ul {
  margin: 0;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 15px;
}

.feedback-grid li + li {
  margin-top: 7px;
}

.contact {
  margin: 28px 0 0;
  max-width: 70ch;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  font-size: 15.5px;
}

.contact a {
  font-weight: 600;
}

.muted {
  color: var(--ink-faint);
  font-size: 14px;
}

/* ------------------------------------------------------------------ footer */

footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 32px 24px 56px;
  border-top: 1px solid var(--rule);
}

/* The footer is one line: the copyright notice, plus a discrete privacy link. */
footer .copyright {
  margin: 0;
  color: var(--ink-faint);
  font-size: 13px;
}

footer .copyright a {
  color: inherit;
}

/* ------------------------------------------------------------ narrow width */

@media (max-width: 860px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 44px;
  }

  .hero-figure {
    order: -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}