/* www.texstage.org - one page, no build step, no external requests. */

:root {
  --bg: #fbfaf8;
  --alt: #f3f1ec;
  --surface: #ffffff;
  --text: #1d1a23;
  --muted: #5d5867;
  --line: #e4e0d9;
  --accent: #4a1a8c;           /* the presenter's top bar */
  --accent-ink: #ffffff;
  --accent-soft: #efe8f9;
  --link: #5b26ad;
  --code-bg: #1e1a28;
  --code-text: #ece8f4;
  --code-cmd: #c8b1ff;
  --code-com: #9a93a8;
  --red: #e0203f;              /* the four answer shapes */
  --blue: #1a6bd0;
  --yellow: #e0a52b;
  --green: #2e8b2e;
  --shadow: 0 1px 2px rgb(30 20 50 / 0.06), 0 12px 32px rgb(30 20 50 / 0.10);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131117;
    --alt: #19161e;
    --surface: #201c26;
    --text: #ecebf0;
    --muted: #a9a3b4;
    --line: #322d3a;
    --accent: #9d7fe8;
    --accent-ink: #140f1d;
    --accent-soft: #2a2238;
    --link: #bba3f2;
    --code-bg: #0e0c13;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 12px 32px rgb(0 0 0 / 0.35);
  }
}

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

html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}

img, video { display: block; max-width: 100%; height: auto; }

a { color: var(--link); text-underline-offset: 0.15em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.2; margin: 0; }
h1 { font-size: clamp(2.25rem, 5vw, 3.5rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.75rem, 3.2vw, 2.4rem); margin-bottom: 0.5rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.1rem; }
p { margin: 0 0 1rem; }

code { font-family: var(--mono); font-size: 0.9em; background: var(--accent-soft); padding: 0.1em 0.35em; border-radius: 4px; }
:not(pre) > code { white-space: nowrap; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.measure > p, .measure > ul { max-width: 46rem; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* Header */

.site-header {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-family: var(--serif); font-size: 1.35rem; font-weight: 600; }
.mark { width: 26px; height: 26px; }
nav { display: flex; align-items: center; gap: 20px; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
nav .nav-cta { color: var(--accent-ink); background: var(--accent); padding: 6px 14px; border-radius: 999px; font-weight: 600; }
nav .nav-cta:hover { color: var(--accent-ink); filter: brightness(1.1); }

/* Hero */

.hero { padding: 72px 0 88px; }
.hero-grid { display: grid; grid-template-columns: 5fr 7fr; gap: 56px; align-items: center; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 0.9rem; letter-spacing: 0.04em; text-transform: uppercase; margin-bottom: 0.75rem; }
.hero h1 { margin-bottom: 1.25rem; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 46rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 1.75rem 0 1.25rem; }
.button {
  display: inline-block; padding: 11px 20px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  font-weight: 600; text-decoration: none;
}
.button:hover { border-color: var(--accent); }
.button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.button.primary:hover { filter: brightness(1.1); }
.fine { font-size: 0.9rem; color: var(--muted); }

.hero-shot { position: relative; margin: 0 0 40px; }
.screen {
  border-radius: 12px; overflow: hidden; background: #1b1a1f;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
.screen::before {
  content: ""; display: block; height: 22px; background: #2a2830;
  background-image: radial-gradient(circle, #ff5f57 4px, transparent 4.5px),
                    radial-gradient(circle, #febc2e 4px, transparent 4.5px),
                    radial-gradient(circle, #28c840 4px, transparent 4.5px);
  background-size: 14px 22px; background-repeat: no-repeat;
  background-position: 10px 0, 26px 0, 42px 0;
}
.phone {
  border: 6px solid #15131a; border-radius: 22px; overflow: hidden; background: #15131a;
  box-shadow: var(--shadow);
}
.hero-shot .phone { position: absolute; width: 27%; right: -18px; bottom: -48px; }
.phone.small { width: 100%; max-width: 220px; margin: 0 auto 20px; border-width: 5px; border-radius: 20px; }

/* Sections */

.section { padding: 88px 0; }
.section.alt { background: var(--alt); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section > .wrap > .lead { margin-bottom: 2.25rem; }
.note { color: var(--muted); max-width: 46rem; margin-top: 1.5rem; }
.sub { margin: 3rem 0 1.25rem; font-size: 1.45rem; }

.code {
  margin: 0 0 1.25rem; padding: 18px 20px; border-radius: 10px;
  background: var(--code-bg); color: var(--code-text);
  font: 14px/1.6 var(--mono); overflow-x: auto; tab-size: 2;
}
.code code { background: none; padding: 0; font-size: inherit; color: inherit; }
.code .c { color: var(--code-cmd); }
.code .k { color: var(--code-com); }

.split { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 32px; align-items: start; margin-bottom: 1.25rem; }
.split-code .code { margin: 0; }
.outputs { display: grid; gap: 12px; }
.outputs-title { margin: 0 0 4px; font-weight: 600; color: var(--muted); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.04em; }
.output { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--line); border-radius: 10px; padding: 14px 18px; }
.output p { margin: 4px 0 0; color: var(--muted); font-size: 0.95rem; }
.output-live { border-left-color: var(--accent); }

.wide-shot { margin: 0 0 3rem; }
.wide-shot figcaption { margin-top: 12px; color: var(--muted); font-size: 0.95rem; text-align: center; }
.wide-shot .screen { max-width: 960px; margin: 0 auto; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.steps .phone.small { max-width: 190px; }
.steps h3 { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.steps p { color: var(--muted); }
.num {
  display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink); font: 600 0.9rem var(--sans);
}

.types { list-style: none; padding: 0; margin: 0 0 3rem; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.types li { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; display: flex; flex-direction: column; }
.types p { color: var(--muted); font-size: 0.95rem; margin: 6px 0 12px; flex: 1; }
.tag { align-self: flex-start; font-size: 0.8rem; font-weight: 600; padding: 2px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.tag.quiet { background: transparent; color: var(--muted); border: 1px solid var(--line); }

.phones-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.phones-row figure { margin: 0; }
.phones-row figcaption { text-align: center; color: var(--muted); font-size: 0.95rem; }

.cards { display: grid; gap: 16px; margin-bottom: 1.5rem; }
.cards.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cards.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 20px 22px; }
.card h3, .card h4 { margin-bottom: 8px; }
.card p { margin: 0; color: var(--muted); }

.features { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px 24px; }
.features h3 { font-size: 1.1rem; margin-bottom: 6px; padding-top: 12px; border-top: 2px solid var(--accent); }
.features p { color: var(--muted); font-size: 0.95rem; margin: 0; }

.demo { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 40px; align-items: center; margin-bottom: 1.5rem; }
.demo-shot { position: relative; display: block; }
.demo-shot img { opacity: 0.85; transition: opacity 0.2s; }
.demo-shot:hover img { opacity: 1; }
.play {
  position: absolute; left: 50%; top: calc(50% + 11px); width: 76px; height: 76px; transform: translate(-50%, -50%);
  border-radius: 50%; background: var(--accent); box-shadow: var(--shadow);
}
.play::after {
  content: ""; position: absolute; left: 31px; top: 24px;
  border-style: solid; border-width: 14px 0 14px 22px; border-color: transparent transparent transparent var(--accent-ink);
}
.chapters { list-style: none; padding: 0; margin: 0 0 1.25rem; display: grid; gap: 4px; font-size: 0.95rem; }
.chapters span { display: inline-block; width: 3.5em; color: var(--accent); font-family: var(--mono); font-size: 0.85rem; }
.chapters a { color: inherit; text-decoration: none; }
.chapters a:hover { text-decoration: underline; }

.code-copy { position: relative; }
.copy {
  position: absolute; top: 10px; right: 10px; z-index: 1;
  background: rgb(255 255 255 / 0.1); color: var(--code-text); border: 1px solid rgb(255 255 255 / 0.2);
  border-radius: 6px; padding: 4px 10px; font: 600 0.8rem var(--sans); cursor: pointer;
}
.copy:hover { background: rgb(255 255 255 / 0.18); }
#install { padding-right: 80px; }

.docs { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.docs li { display: grid; grid-template-columns: 13rem minmax(0, 1fr); gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.docs li > a { font-weight: 600; }
.docs span { color: var(--muted); }

.plain { padding-left: 1.2rem; margin: 0 0 1rem; }
.plain li { margin-bottom: 0.4rem; }

/* Footer */

.site-footer { padding: 32px 0 40px; color: var(--muted); font-size: 0.9rem; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
.footer-row p { margin: 0; }

.legal h1 { font-size: clamp(2rem, 4vw, 2.75rem); margin-bottom: 1.5rem; }
.legal h2 { font-size: 1.6rem; margin: 2.75rem 0 1rem; }
.legal h3 { margin: 1.75rem 0 0.5rem; }
.legal address { font-style: normal; margin-bottom: 1rem; }

/* Narrower screens */

@media (max-width: 960px) {
  .hero { padding: 48px 0 72px; }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .hero-shot { margin-right: 12px; }
  .hero-shot .phone { right: -12px; width: 26%; }
  .split { grid-template-columns: minmax(0, 1fr); }
  .features { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .types { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .nav-hide { display: none; }
  .section { padding: 64px 0; }
  .steps, .cards.two, .cards.three, .demo { grid-template-columns: minmax(0, 1fr); }
  .steps { gap: 32px; }
  .docs li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .types, .features { grid-template-columns: minmax(0, 1fr); }
  .phones-row { gap: 12px; }
  .phone.small { border-width: 4px; border-radius: 16px; }
  .code { font-size: 13px; padding: 14px 16px; }
  .hero-shot .phone { bottom: -36px; border-width: 4px; border-radius: 16px; }
}