:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f0f2f5;
  --text: #1b1c1e;
  --text-dim: #5c6169;
  --border: #dfe2e7;
  --accent: #2f6fd0;
  --accent-soft: #e6effc;
  --shadow: 0 1px 2px rgba(16, 22, 32, .06), 0 8px 24px rgba(16, 22, 32, .08);
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --surface: #1f2228;
    --surface-2: #262a31;
    --text: #e7e9ec;
    --text-dim: #a2a9b4;
    --border: #333842;
    --accent: #7aa9f0;
    --accent-soft: #23324a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI Variable Text", "Segoe UI", "Yu Gothic UI", "Hiragino Sans", Meiryo, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

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

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px 96px;
}

/* ---- header ---- */

header.hero {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 40px;
}

header.hero .wrap { padding-top: 40px; padding-bottom: 32px; }

.langbar {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  font-size: 14px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.langbar .current { color: var(--text); font-weight: 600; }
.langbar .intro-link { margin-right: auto; }

h1 {
  font-size: 34px;
  line-height: 1.25;
  margin: 0 0 8px;
  letter-spacing: -.01em;
}

.tagline { margin: 0; color: var(--text-dim); font-size: 17px; }

.badges { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }

.badge {
  font-size: 13px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text-dim);
}

/* ---- table of contents ---- */

nav.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 44px;
}

nav.toc h2 { font-size: 14px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-dim); margin: 0 0 10px; }
nav.toc ol { margin: 0; padding-left: 20px; columns: 2; column-gap: 32px; }
nav.toc li { margin: 2px 0; break-inside: avoid; }

@media (max-width: 620px) { nav.toc ol { columns: 1; } }

/* ---- sections ---- */

section { margin-bottom: 56px; scroll-margin-top: 16px; }

h2 {
  font-size: 24px;
  margin: 0 0 6px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

h3 { font-size: 18px; margin: 28px 0 4px; }

p { margin: 12px 0; }

ul, ol { padding-left: 22px; }
li { margin: 4px 0; }

code {
  font-family: "Cascadia Mono", Consolas, "SF Mono", monospace;
  font-size: .9em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}

/* ---- figures ---- */

figure { margin: 22px 0; }

figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  background: var(--surface);
}

figcaption {
  margin-top: 10px;
  font-size: 14px;
  color: var(--text-dim);
}

.shot-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 700px) { .shot-pair { grid-template-columns: 1fr; } }

/* ---- callouts over the overview screenshot ---- */

.callout-shot { position: relative; }

.callout-shot .pin {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  line-height: 26px;
  text-align: center;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, .9), 0 2px 6px rgba(0, 0, 0, .3);
}

@media (max-width: 560px) {
  .callout-shot .pin { width: 20px; height: 20px; line-height: 20px; font-size: 12px; }
}

ol.legend { counter-reset: none; list-style: none; padding-left: 0; }

ol.legend li {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: start;
  margin: 8px 0;
}

ol.legend li::before {
  content: counter(legend-item);
  counter-increment: legend-item;
  width: 22px;
  height: 22px;
  margin-top: 3px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  line-height: 22px;
  text-align: center;
}

ol.legend { counter-reset: legend-item; }

/* ---- notes ---- */

.note {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 12px 18px;
  margin: 20px 0;
}

.note p:first-child { margin-top: 0; }
.note p:last-child { margin-bottom: 0; }

/* ---- steps ---- */

ol.steps { padding-left: 20px; }
ol.steps > li { margin: 14px 0; }
ol.steps > li > strong { display: block; }

/* ---- tables ---- */

.table-wrap { overflow-x: auto; }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 15px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--surface-2); font-weight: 600; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }

/* ---- footer ---- */

footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  font-size: 14px;
}

footer .wrap { padding-top: 28px; padding-bottom: 40px; }
footer ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 18px; margin: 0 0 12px; }

/* ---- buttons / support (shared with the intro page) ---- */

.btn {
  display: inline-block;
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: 600;
  border: 1px solid var(--accent);
}

.btn:hover { text-decoration: none; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.secondary { background: var(--surface); color: var(--accent); }

@media (prefers-color-scheme: dark) {
  .btn.primary { color: #0d1522; }
}

#support { margin-bottom: 48px; }

.support-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}