/* landing — tokens, fonts, nav, buttons, hero, product shot (layout and type follow mermaid.ai/landing) */
@font-face {
  font-family: "Instrument Serif";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./fonts/instrument-serif-latin-400-normal.woff2") format("woff2");
}
@font-face {
  font-family: "Inter Variable";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("./fonts/inter-latin-wght-normal.woff2") format("woff2-variations");
}
:root {
  --bg: #ffffff;
  --panel: #ffffff;
  --soft: #f6f5f3;
  --stroke: rgba(18, 18, 18, 0.1);
  --stroke-strong: rgba(18, 18, 18, 0.16);
  --text: #121212;
  --muted: #5c5c5f;
  --faint: #8a8a8e;
  --brand: #db4c84;
  --brand-hover: #c43e72;
  --accent: var(--brand);
  --accent-soft: #fbf2f8;
  --ok: #248a3d;
  --violet: #5e5ce6;
  --purple: #af52de;
  --blue: #0071e3;
  --shadow: 0 24px 60px rgba(18, 18, 18, 0.12);
  --serif: "Instrument Serif", Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --font: "Inter Variable", Inter, system-ui, -apple-system, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
  --page: 1120px;
  --nav-h: 80px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
code { font-family: var(--mono); font-size: 0.9em; }
h1, h2, h3, h4, p, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }

/* auth-state visibility: html[data-auth] is set by landing.js */
html[data-auth="in"] .only-out { display: none !important; }
html[data-auth="out"] .only-in { display: none !important; }

/* nav bar, hero, h1 and button sizes copy mermaid.ai/landing (read from its computed styles at 1512px) */
.site-nav { position: absolute; top: 0; left: 0; right: 0; z-index: 2; background: transparent; }
.site-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; font-size: 17px; color: var(--brand); }
.brand-mark { width: 26px; height: 26px; display: block; }
.site-actions { display: flex; align-items: center; gap: 16px; }

/* signed-in mark: a small circle with the email initial; the green dot is the status */
.auth-status {
  position: relative;
  width: 40px;
  height: 40px;
  flex: none;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 2px 8px rgba(18, 18, 18, 0.12);
  color: var(--brand);
  font-size: 15px;
  font-weight: 650;
  cursor: default;
}
.auth-status::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 12px;
  height: 12px;
  box-sizing: border-box;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--faint);
}
.auth-status[data-state="in"]::after { background: var(--ok); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 16px;
  border: 0;
  border-radius: 12px;
  background: var(--brand);
  color: #fff;
  box-shadow: 0 2px 8px rgba(18, 18, 18, 0.12);
  font-size: 14px;
  line-height: 20px;
  letter-spacing: 0.025em;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s;
}
.btn:hover { background: var(--brand-hover); }
.btn-primary { padding: 12px 16px; font-size: 16px; line-height: 24px; }
.btn-lg { padding: 12px 20px; font-size: 16px; line-height: 24px; }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn:focus-visible, summary:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }
.brand span { white-space: nowrap; }

.hero {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: calc(48px + var(--nav-h)) 0 64px;
  text-align: center;
  background: #f4e8d6 url("./hero-art.webp") center / cover no-repeat;
}
.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  width: 100%;
  max-width: 1280px;
  padding: 0 20px;
}
.hero h1 {
  font: 400 48px / 48px var(--serif);
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.hero h1 span { display: block; }
.hero-lead { font-size: 16px; line-height: 24px; text-wrap: balance; }
.cta-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 16px; }

@media (min-width: 601px) {
  .hero h1 { font-size: 120px; line-height: 120px; }
  .hero-lead { font-size: 18px; line-height: 26px; }
}
@media (min-width: 768px) {
  .hero {
    align-items: center;
    block-size: 100vh;
    block-size: 100dvh;
    padding: var(--nav-h) 0 0;
  }
}
@media (min-width: 1024px) {
  :root { --nav-h: 96px; }
  .site-nav-inner { padding: 24px 32px; }
  .hero-inner { gap: 44px; }
}
@media (max-width: 860px) {
  .auth-status { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}