:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --surface-2: #efefec;
  --text: #17181a;
  --muted: #5d6066;
  --border: #dcdcd7;
  --accent: #4157ea;
  --accent-soft: #e4e8fd;
  --good: #1f8a4c;
  --warn: #b26b00;
  --dot: #ff453a;
  --radius: 14px;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1012;
    --surface: #17181b;
    --surface-2: #202226;
    --text: #ececea;
    --muted: #9a9ca3;
    --border: #2c2e33;
    --accent: #7d8cff;
    --accent-soft: #1e2347;
    --good: #4cc27f;
    --warn: #f0a94a;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0f1012;
  --surface: #17181b;
  --surface-2: #202226;
  --text: #ececea;
  --muted: #9a9ca3;
  --border: #2c2e33;
  --accent: #7d8cff;
  --accent-soft: #1e2347;
  --good: #4cc27f;
  --warn: #f0a94a;
  color-scheme: dark;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
}

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

h1, h2, h3, .brand { font-family: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 21px;
  color: var(--text);
  text-decoration: none;
}

nav.links { display: flex; gap: 20px; font-size: 15px; }
nav.links a { color: var(--muted); text-decoration: none; }
nav.links a:hover { color: var(--text); }

.hero { padding: 56px 0 40px; }
.hero h1 {
  font-size: clamp(36px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 18px;
  max-width: 14ch;
}
.hero p.lede { font-size: 19px; color: var(--muted); max-width: 56ch; margin: 0 0 28px; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

section { padding: 40px 0; }
section h2 { font-size: 28px; letter-spacing: -0.02em; margin: 0 0 8px; }
section p.sub { color: var(--muted); margin: 0 0 28px; max-width: 60ch; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .step { font-family: var(--mono); font-size: 13px; color: var(--accent); margin-bottom: 8px; }

ul.rules { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
ul.rules li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
}
ul.rules strong { display: block; }
ul.rules span { color: var(--muted); font-size: 15px; }

pre {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font: 14px/1.6 var(--mono);
  margin: 0 0 16px;
}

code { font-family: var(--mono); font-size: 0.92em; }

.os-tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.os-tabs button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 14px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.os-tabs button[aria-selected="true"] { background: var(--accent-soft); color: var(--text); border-color: var(--accent); }

.note { color: var(--muted); font-size: 14px; }
.note { margin: 0 0 24px; }

.copy-block { position: relative; }
.copy-block pre { padding-right: 92px; white-space: pre; }
.copy-block .copy {
  position: absolute;
  top: 7px;
  right: 7px;
  padding: 6px 12px;
  font-size: 13px;
}

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* Hero illustration: three monitors, a cursor jumping to the looked-at one. */
.scene {
  margin-top: 40px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.screen {
  position: relative;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.25s, box-shadow 0.25s;
}
.screen.active { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.screen.s1 { width: 190px; height: 112px; }
.screen.s2 { width: 150px; height: 96px; }
.screen.s3 { width: 96px; height: 160px; }
.screen .cursor {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  background: var(--dot);
  opacity: 0;
  transition: opacity 0.2s;
}
.screen.active .cursor { opacity: 1; }

@media (max-width: 560px) {
  nav.links { gap: 14px; font-size: 14px; }
  nav.links a.wide { display: none; }
  .screen.s1 { width: 130px; height: 78px; }
  .screen.s2 { width: 104px; height: 66px; }
  .screen.s3 { width: 64px; height: 108px; }
}

@media (prefers-reduced-motion: reduce) {
  .screen, .screen .cursor { transition: none; }
}