/* Fluxion website. Palette from the brand: night sky of the logo, the ribbon's
   violet and cyan, lime reserved for the moving point. */
:root {
  --sky: #0B1620;          /* page */
  --sky-raised: #10212E;   /* table heads, build rows */
  --line: #1F3647;
  --text: #E6EDF3;
  --muted: #9BB0C3;
  --violet: #8B4BFF;       /* actions */
  --violet-hover: #9D66FF;
  --cyan: #00E5FF;         /* links, the tangent */
  --lime: #B4FF39;         /* the moving point only */

  --display: "Unbounded", "Segoe UI", system-ui, sans-serif;
  --body: "Golos Text", "Segoe UI", system-ui, sans-serif;
  --math: "Cambria Math", "STIX Two Math", "Times New Roman", serif;

  /* type scale, ratio 1.25 on a 17px body */
  --step--1: 0.85rem;
  --step-0: 1.0625rem;
  --step-1: 1.33rem;
  --step-2: 1.66rem;
  --step-3: 2.07rem;
  --step-4: clamp(2rem, 3.6vw, 2.9rem);

  --measure: 68ch;
  --page: min(1160px, 100% - 3rem);
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--sky);
  color: var(--text);
  font-family: var(--body);
  font-size: var(--step-0);
  line-height: 1.55;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--cyan); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 2px; }

code {
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.9em;
  background: var(--sky-raised);
  padding: 0.08em 0.35em;
  border-radius: 3px;
}

.skip {
  position: absolute; left: -999px; top: 0.5rem;
  background: var(--violet); color: #fff; padding: 0.5rem 1rem; z-index: 10;
}
.skip:focus { left: 0.5rem; }

/* ── header ─────────────────────────────────────────────────────────── */
.top {
  width: var(--page);
  margin: 0 auto;
  padding: 1.4rem 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.wordmark {
  font-family: var(--display);
  font-weight: 500;
  letter-spacing: 0.06em;
  font-size: var(--step-0);
  color: var(--text);
  text-decoration: none;
}
.wordmark.small { font-size: var(--step--1); color: var(--muted); margin: 0; }
.top nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }
.top nav a { color: var(--muted); text-decoration: none; font-size: var(--step--1); }
.top nav a:hover { color: var(--text); }

/* ── hero ───────────────────────────────────────────────────────────── */
main > section { width: var(--page); margin: 0 auto; }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 3rem;
  align-items: center;
  padding: 3.5rem 0 4rem;
}
.hero h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: var(--step-4);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 1.4rem;
  max-width: 21ch;
  text-wrap: balance;
}
.lead { font-size: var(--step-1); line-height: 1.5; color: var(--muted); max-width: 44ch; margin: 0 0 2rem; }

.cta { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.cta-note { margin: 0; color: var(--muted); font-size: var(--step--1); max-width: 26ch; line-height: 1.4; }
.secondary { margin: 1.2rem 0 0; font-size: var(--step--1); }

.button {
  display: inline-block;
  font-family: var(--body);
  font-weight: 600;
  font-size: var(--step-0);
  padding: 0.8rem 1.35rem;
  border-radius: 8px;
  border: 1.5px solid var(--violet);
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.button:hover { border-color: var(--violet-hover); text-decoration: none; }
.button.primary { background: var(--violet); color: #fff; }
.button.primary:hover { background: var(--violet-hover); }
.button[aria-disabled="true"] { opacity: 0.55; pointer-events: none; }

.flux { margin: 0; }
.flux svg { width: 100%; height: auto; display: block; overflow: visible; }
.flux .curve { opacity: 0.9; }
.flux .integral { font-family: var(--math); font-style: italic; font-size: 44px; fill: var(--muted); }
.dot-x { font-family: var(--math); font-style: italic; }
.flux text.dot-x { font-size: 30px; fill: var(--cyan); }
.flux figcaption {
  margin-top: 1rem;
  color: var(--muted);
  font-size: var(--step--1);
  max-width: 48ch;
  line-height: 1.5;
}
.flux figcaption .dot-x { color: var(--cyan); font-size: 1.2em; }

/* ── features ───────────────────────────────────────────────────────── */
.features { padding: 0 0 4.5rem; border-bottom: 1px solid var(--line); }
.features dl {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2rem 2.5rem;
}
.features dt { font-family: var(--display); font-weight: 500; font-size: var(--step-0); margin-bottom: 0.5rem; }
.features dd { margin: 0; color: var(--muted); font-size: var(--step--1); line-height: 1.55; }
.badge {
  display: inline-block; margin-left: 0.35rem; padding: 0.05rem 0.45rem; vertical-align: 0.15em;
  border: 1px solid var(--cyan); border-radius: 999px; color: var(--cyan);
  font-family: var(--body); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.02em;
}

/* ── sections ───────────────────────────────────────────────────────── */
#download, #pro, #models, #presets { padding: 4.5rem 0 1rem; }
h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: var(--step-3);
  line-height: 1.15;
  margin: 0 0 0.9rem;
}
h3 { font-family: var(--display); font-weight: 500; font-size: var(--step-1); margin: 0 0 0.7rem; line-height: 1.25; }
.section-lead { color: var(--muted); max-width: var(--measure); margin: 0 0 2rem; }
.note { color: var(--muted); font-size: var(--step--1); margin: 0.9rem 0 0; }

/* builds: a two-row choice list, not two identical cards */
.builds { border-top: 1px solid var(--line); margin-bottom: 3rem; }
.build {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}
.build h3 { margin-bottom: 0.3rem; }
.build p { margin: 0; color: var(--muted); max-width: 52ch; }
.build p.build-alt { margin-top: 0.4rem; font-size: var(--step--1); }
.build-alt .size { min-width: 0; text-align: left; }
.build-action { display: flex; align-items: center; gap: 1.2rem; flex-shrink: 0; }
.size { display: inline-block; color: var(--muted); font-size: var(--step--1); min-width: 9ch; text-align: right; }
.build .fallback { color: var(--muted); font-size: var(--step--1); max-width: 30ch; text-align: right; }

/* prices: same choice list as the builds, with a price in place of a size */
.price { font-family: var(--display); font-weight: 500; font-size: var(--step-1); white-space: nowrap; }
.price-old { color: var(--muted); font-size: var(--step--1); white-space: nowrap; }
.price-box { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.3; }
.price-term { color: var(--muted); font-size: var(--step--1); }
.build .price-note { margin-top: 0.6rem; font-size: var(--step--1); color: var(--cyan); }
.price-note:empty { display: none; }

.two-col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.5rem 4rem; margin-top: 2.5rem; }
.two-col p { max-width: 52ch; margin: 0; color: var(--muted); }

.steps { margin: 0; padding-left: 1.4rem; max-width: 56ch; }
.steps li { margin-bottom: 0.7rem; padding-left: 0.3rem; }
.steps li::marker { font-family: var(--display); color: var(--cyan); }
.plain { margin: 0; padding-left: 1.2rem; max-width: 56ch; }
.plain li { margin-bottom: 0.6rem; }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; font-size: var(--step--1); min-width: 720px; }
thead th {
  text-align: left;
  font-weight: 500;
  color: var(--muted);
  background: var(--sky-raised);
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
}
tbody th, tbody td { padding: 1rem; border-bottom: 1px solid var(--line); vertical-align: top; text-align: left; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody th { font-weight: 600; color: var(--text); min-width: 11ch; }
tbody td { color: var(--muted); line-height: 1.5; }
th.num, td.num { text-align: right; white-space: nowrap; }
.pro {
  display: inline-block;
  margin-left: 0.4em;
  padding: 0.05em 0.45em;
  border: 1px solid var(--violet);
  border-radius: 4px;
  color: #C4A6FF;
  font-size: 0.8em;
  font-weight: 600;
  vertical-align: 0.1em;
}
.via-app { color: var(--muted); }
td:last-child { white-space: nowrap; }

/* ── footer ─────────────────────────────────────────────────────────── */
footer {
  width: var(--page);
  margin: 5rem auto 0;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 2rem;
}
footer nav { display: flex; gap: 1.4rem; flex-wrap: wrap; font-size: var(--step--1); }
footer .fine { width: 100%; margin: 0; color: var(--muted); font-size: var(--step--1); }

/* ── responsive ─────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 2rem; }
  .flux { max-width: 560px; }
  .features dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  :root { --page: min(1160px, 100% - 2rem); }
  .top nav { gap: 1rem; }
  .features dl, .two-col { grid-template-columns: 1fr; }
  .build { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .size, .build .fallback { text-align: left; }
  .price-box { align-items: flex-start; }
  .size:empty { display: none; }
  .lead { font-size: var(--step-0); }
}

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

/* the SHA-256 of the downloads, to check a file */
.sha { margin: 0.35rem 0 0; font-family: "Cascadia Mono", Consolas, monospace; font-size: 0.72rem; color: var(--muted);
       overflow-wrap: anywhere; }
.sha-how { margin: 0.5rem 0 0; font-size: var(--step--1); color: var(--muted); }