:root {
  --ink: #2340b0;
  --ink-deep: #1b2a6b;
  --ink-soft: #e8ecfb;
  --paper: #f8f5ee;
  --card: #ffffff;
  --text: #1d2133;
  --muted: #5b6075;
  --line: #e3dfd4;
  --orange: #e2702b;
  --blue: #3157d5;
  --code-bg: #fbfaf6;
  --shadow: 0 1px 2px rgba(20, 28, 70, 0.06), 0 12px 32px rgba(20, 28, 70, 0.08);
  --serif: ui-serif, "New York", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #8ea2ff;
    --ink-deep: #c9d2ff;
    --ink-soft: #1f2645;
    --paper: #12141c;
    --card: #1a1d28;
    --text: #e8e9f0;
    --muted: #a0a4b8;
    --line: #2b2f3d;
    --code-bg: #161923;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font: 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 1080px; margin: 0 auto; padding-inline: 20px; }

/* Header */
.top { display: flex; align-items: center; justify-content: space-between; padding-block: 22px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 650; font-size: 18px; }
.brand:hover { text-decoration: none; }
.brand img { width: 30px; height: 30px; }
.top nav { display: flex; gap: 22px; font-size: 15px; }
.top nav a { color: var(--muted); }

/* Hero */
.hero { display: grid; grid-template-columns: 1fr; gap: 48px; padding-block: 56px 72px; align-items: center; }
@media (min-width: 900px) { .hero { grid-template-columns: 1fr 1.05fr; padding-block: 72px 96px; } }
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 60px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--ink-deep);
}
.hero p.lead { font-size: 19px; color: var(--muted); margin: 0 0 28px; max-width: 34em; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 999px;
  background: var(--ink); color: #fff; font-weight: 600; font-size: 15px;
}
@media (prefers-color-scheme: dark) { .badge { color: #10142a; } }
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--orange); }
.requirements { margin-top: 14px; font-size: 14px; color: var(--muted); }

/* Illustration: an editor window, source beside its typeset page */
.window { background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; }
.window .bar { display: flex; align-items: center; gap: 7px; padding: 11px 14px; border-bottom: 1px solid var(--line); }
.window .bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--line); display: block; }
.window .bar span { margin-left: 10px; font-size: 13px; color: var(--muted); }
.panes { display: grid; grid-template-columns: 1fr 1fr; min-height: 280px; }
.source { background: var(--code-bg); border-right: 1px solid var(--line); padding: 16px 16px 16px 12px; font: 12.5px/1.75 var(--mono); overflow: hidden; white-space: pre; }
.source .n { display: inline-block; width: 18px; color: var(--muted); opacity: 0.55; text-align: right; margin-right: 12px; }
.source .c { color: var(--ink); }
.source .b { color: var(--orange); }
.source .t { color: var(--muted); }
.page { padding: 26px 24px; font-family: var(--serif); color: var(--text); }
.page h3 { font-size: 17px; margin: 0 0 10px; font-weight: 700; }
.page p { font-size: 14px; line-height: 1.6; margin: 0 0 14px; }
.page .eq { text-align: center; font-size: 19px; font-style: italic; margin: 18px 0; letter-spacing: 0.02em; }
.page .eq sup { font-size: 0.62em; }
@media (max-width: 560px) {
  .panes { grid-template-columns: 1fr; }
  .source { border-right: 0; border-bottom: 1px solid var(--line); }
}

/* Features */
section.features { padding: 24px 0 80px; }
section h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(28px, 4vw, 38px); color: var(--ink-deep); margin: 0 0 10px; letter-spacing: -0.01em; }
section .sub { color: var(--muted); margin: 0 0 36px; max-width: 40em; }
.grid { display: grid; gap: 18px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 960px) { .grid { grid-template-columns: 1fr 1fr 1fr; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 22px 22px 20px; }
.card .icon { width: 36px; height: 36px; border-radius: 9px; background: var(--ink-soft); color: var(--ink); display: grid; place-items: center; margin-bottom: 14px; }
.card .icon svg { width: 20px; height: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.55; }

/* Native */
section.native { padding: 0 0 88px; }
.native .row { display: grid; gap: 28px; grid-template-columns: 1fr; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 32px; }
@media (min-width: 860px) { .native .row { grid-template-columns: 1.1fr 1fr; padding: 40px 44px; } }
.native ul { margin: 0; padding: 0; list-style: none; }
.native li { padding: 10px 0; border-bottom: 1px solid var(--line); display: flex; gap: 12px; color: var(--muted); font-size: 15.5px; }
.native li:last-child { border-bottom: 0; }
.native li b { color: var(--text); font-weight: 600; min-width: 7.5em; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
footer nav { display: flex; gap: 20px; }
footer a { color: var(--muted); }

/* Text pages (privacy) */
.doc { max-width: 720px; padding-block: 32px 80px; }
.doc h1 { font-family: var(--serif); font-weight: 600; font-size: clamp(32px, 5vw, 44px); color: var(--ink-deep); margin: 16px 0 6px; }
.doc .date { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
.doc h2 { font-size: 20px; margin: 36px 0 10px; color: var(--text); font-family: var(--sans); }
.doc p, .doc li { color: var(--text); }
.doc ul { padding-left: 1.2em; }
.doc li { margin: 6px 0; }