:root {
  /* Brand colours (brand/BRAND.md). Green marks the decision taken, nothing else. */
  --ink: #171717;
  --cream: #F5F2EC;
  --dark: #141414;
  --green: #2E9E6B;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;

  /* Dark theme (default) */
  color-scheme: dark;
  --bg: var(--dark);
  --bg-alt: #181818;
  --fg: var(--cream);
  --fg-2: #d6d2ca;
  --fg-3: #cfcac1;
  --muted: #a8a49c;
  --panel: #1c1c1c;
  --panel-2: #222;
  --line: #2e2e2e;
  --line-strong: #4a4a4a;
  --header-bg: rgba(20, 20, 20, 0.86);
  --code-fg: #e9e5dd;
  --code-key: #c8c3b9;
  --code-str: #d9c9a3;
  --code-num: #9fc3e0;
  --code-comment: #8f8a82;
  --primary-bg: var(--cream);
  --primary-fg: var(--ink);
  --primary-hover: #fff;
  /* Small text that marks the decision taken. Green text has enough
     contrast on dark; on light it is ink text with a green mark. */
  --go-text: var(--green);
}

/* Light theme: on the cream background, with ink text. Used when the visitor
   chose it, or when the system prefers light and no choice was made. The two
   blocks are the same; the media query covers pages without JavaScript. */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: var(--cream);
  --bg-alt: #EDE9E1;
  --fg: var(--ink);
  --fg-2: #33302b;
  --fg-3: #45413a;
  --muted: #6b665e;
  --panel: #FBFAF7;
  --panel-2: #F1EEE7;
  --line: #DCD6CA;
  --line-strong: #B9B2A5;
  --header-bg: rgba(245, 242, 236, 0.88);
  --code-fg: #26231f;
  --code-key: #57524a;
  --code-str: #8a5a12;
  --code-num: #1f5f8b;
  --code-comment: #6b665e;
  --primary-bg: var(--ink);
  --primary-fg: var(--cream);
  --primary-hover: #000;
  --go-text: var(--fg);
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: var(--cream);
    --bg-alt: #EDE9E1;
    --fg: var(--ink);
    --fg-2: #33302b;
    --fg-3: #45413a;
    --muted: #6b665e;
    --panel: #FBFAF7;
    --panel-2: #F1EEE7;
    --line: #DCD6CA;
    --line-strong: #B9B2A5;
    --header-bg: rgba(245, 242, 236, 0.88);
    --code-fg: #26231f;
    --code-key: #57524a;
    --code-str: #8a5a12;
    --code-num: #1f5f8b;
    --code-comment: #6b665e;
    --primary-bg: var(--ink);
    --primary-fg: var(--cream);
    --primary-hover: #000;
  --go-text: var(--fg);
  }
}

/* The logo for the current theme: the cream version on dark, ink on light. */
.logo-light { display: none !important; }
:root[data-theme="light"] .logo-dark { display: none !important; }
:root[data-theme="light"] .logo-light { display: block !important; }
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .logo-dark { display: none !important; }
  :root:not([data-theme="dark"]) .logo-light { display: block !important; }
}

/* Theme switch */
/* Hidden until theme.js runs (it sets data-theme-ready): without JavaScript
   the page follows the system setting and the button would do nothing. */
.theme-toggle { display: none; }
:root[data-theme-ready] .theme-toggle { display: inline-grid; }
.theme-toggle { place-items: center; width: 40px; height: 40px; padding: 0; border-radius: 8px; border: 1px solid var(--line); background: transparent; color: var(--muted); cursor: pointer; }
.theme-toggle:hover { color: var(--fg); border-color: var(--line-strong); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { display: block; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { font-family: var(--mono); font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; margin: 0; }
code, pre { font-family: var(--mono); font-size: 0.86em; }
p { margin: 0; }

/* Navigation */
header.nav { position: sticky; top: 0; z-index: 10; background: var(--header-bg); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
header.nav .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
header.nav .brand { margin-right: auto; display: flex; }
header.nav .brand img { height: 28px; width: auto; }
header.nav nav { display: flex; gap: 16px; font-size: 15px; }
header.nav nav a { text-decoration: none; color: var(--muted); }
header.nav nav a:hover { color: var(--fg); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 8px; font: 500 15px/1 var(--sans); text-decoration: none; border: 1px solid var(--line); white-space: nowrap; }
.btn:hover { border-color: var(--line-strong); }
.btn.primary { background: var(--primary-bg); color: var(--primary-fg); border-color: var(--primary-bg); }
.btn.primary:hover { background: var(--primary-hover); }
.btn svg { width: 18px; height: 18px; }

/* Hero */
.hero { padding: 88px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: center; }
.eyebrow { font: 500 13px/1 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); margin-bottom: 20px; }
.hero h1 { font-size: clamp(36px, 5.2vw, 58px); letter-spacing: -0.04em; }
.hero h1 .go { color: var(--green); }
.hero .lead { margin-top: 22px; font-size: 19px; color: var(--fg-2); max-width: 34em; }
.hero .actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.chip { font: 13px/1 var(--mono); color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 7px 12px; }

/* Code cards */
.card-code { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.card-code .bar { display: flex; justify-content: space-between; gap: 12px; padding: 10px 16px; border-bottom: 1px solid var(--line); font: 12px/1.4 var(--mono); color: var(--muted); }
.card-code pre { margin: 0; padding: 18px 20px; overflow-x: auto; line-height: 1.6; color: var(--code-fg); }
.card-code + .card-code { margin-top: 14px; }
.k { color: var(--code-key); }
.s { color: var(--code-str); }
.n { color: var(--code-num); }
.c { color: var(--code-comment); }
.go-val { color: var(--go-text); font-weight: 600; text-decoration: underline 2px var(--green); text-underline-offset: 3px; }

/* Sections */
section.band { padding: 88px 0; border-top: 1px solid var(--line); }
section.band.alt { background: var(--bg-alt); }
.section-head { max-width: 46em; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 38px); }
.section-head p { margin-top: 14px; color: var(--muted); font-size: 18px; }

.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--fg-3); font-size: 16px; }
.card code, .faq code { background: var(--panel-2); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; }
.card .more { display: inline-block; margin-top: 14px; font: 14px var(--mono); color: var(--muted); text-decoration: none; }
.card .more:hover { color: var(--fg); }

/* Flow */
.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
.flow li { list-style: none; position: relative; padding: 0 22px 0 0; }
.flow li::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; border: 1px solid var(--line-strong); font: 600 15px var(--mono); margin-bottom: 18px; background: var(--bg); position: relative; z-index: 1; }
.flow li::after { content: ''; position: absolute; top: 17px; left: 34px; right: 0; height: 1px; background: var(--line); }
.flow li:last-child::after { display: none; }
.flow li:last-child::before { background: var(--green); border-color: var(--green); color: var(--dark); }
.flow h3 { font-size: 17px; margin-bottom: 8px; }
.flow p { color: var(--fg-3); font-size: 15.5px; }
.flow-wrap { padding: 0; margin: 0; }
.flow-3 { grid-template-columns: repeat(3, 1fr); }
.note { margin-top: 28px; color: var(--muted); font-size: 15.5px; }
.outcomes { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
.outcomes code { border: 1px solid var(--line); border-radius: 6px; padding: 3px 8px; font-size: 13px; }
.outcomes code.auto { color: var(--go-text); border-color: var(--green); box-shadow: inset 3px 0 0 var(--green); }

.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; align-items: start; }
.points { margin: 24px 0 0; padding: 0; list-style: none; display: grid; gap: 16px; }
.points li { padding-left: 22px; position: relative; color: var(--fg-2); }
.points li::before { content: ''; position: absolute; left: 0; top: 0.62em; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid var(--muted); }
.points strong { color: var(--fg); font-weight: 600; }

/* Get started */
.steps { counter-reset: s; display: grid; gap: 18px; margin: 0; padding: 0; }
.steps > li { list-style: none; display: grid; grid-template-columns: 40px 1fr; gap: 16px; }
.steps > li::before { counter-increment: s; content: counter(s); font: 600 15px var(--mono); width: 34px; height: 34px; border: 1px solid var(--line-strong); border-radius: 50%; display: grid; place-items: center; }
.steps h3 { font-size: 17px; margin: 5px 0 10px; }
.steps p { color: var(--fg-3); margin-bottom: 10px; }

/* FAQ */
.faq { max-width: 52em; display: grid; gap: 12px; }
.faq details { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
.faq summary { cursor: pointer; padding: 18px 22px; font-weight: 600; font-size: 17px; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq details > p, .faq details > ul { color: var(--fg-3); font-size: 16px; margin: 16px 22px; }
.faq details > ul { padding-left: 20px; }
.faq details > ul li + li { margin-top: 6px; }

.status { margin-top: 36px; padding: 16px 20px; border: 1px dashed var(--line-strong); border-radius: 10px; color: var(--muted); font-size: 15.5px; }
.status a { color: var(--fg); }

footer { border-top: 1px solid var(--line); padding: 40px 0 56px; color: var(--muted); font-size: 15px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: center; justify-content: space-between; }
footer img { height: 26px; width: auto; }
footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--fg); }

/* Language link */
.lang { font: 14px/1 var(--mono); color: var(--muted); text-decoration: none; padding: 8px 4px; }
.lang:hover { color: var(--fg); }

/* Japanese: IBM Plex Mono has no Japanese glyphs. Japanese pages switch the
   font variables, so every element (buttons, chips, labels, code) gets
   IBM Plex Sans JP for Japanese text; code keeps Plex Mono for Latin. */
:lang(ja) {
  --sans: 'IBM Plex Sans JP', system-ui, -apple-system, 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --mono: 'IBM Plex Mono', 'IBM Plex Sans JP', ui-monospace, SFMono-Regular, Menlo, monospace;
}
:lang(ja) body { line-height: 1.75; }
:lang(ja) h1, :lang(ja) h2, :lang(ja) h3 { font-family: var(--sans); font-weight: 600; letter-spacing: 0; }
:lang(ja) .hero h1 { letter-spacing: -0.01em; line-height: 1.3; }
:lang(ja) .eyebrow { letter-spacing: 0.08em; }
/* Break Japanese headings between phrases, not inside them: auto-phrase where
   supported (Chromium); elsewhere the .phrase spans in long headings keep
   phrases together. */
@supports (word-break: auto-phrase) {
  :lang(ja) h1, :lang(ja) h2, :lang(ja) h3 { word-break: auto-phrase; }
}
.phrase { display: inline-block; }

/* The header needs about 880px on one line (English is the widest). */
header.nav nav a, .lang { white-space: nowrap; }
@media (max-width: 960px) {
  header.nav nav { display: none; }
}
@media (max-width: 900px) {
  .hero { padding: 56px 0 48px; }
  .hero .wrap, .split { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .grid3 { grid-template-columns: 1fr 1fr; }
  .flow { grid-template-columns: 1fr 1fr; gap: 32px 0; }
  .flow li:nth-child(2)::after { display: none; }
  .flow-3 { grid-template-columns: minmax(0, 1fr); }
  .flow-3 li::after { display: none; }
}
@media (max-width: 600px) {
  header.nav .wrap { gap: 12px; }
  .wrap { padding: 0 16px; }
  body { font-size: 16px; }
  header.nav .btn span { display: none; }
  header.nav .brand img { height: 24px; }
  header.nav .btn { padding: 0; width: 36px; height: 36px; justify-content: center; }
  .theme-toggle { width: 36px; height: 36px; }
  .lang { padding: 8px 0; }
  .grid3, .grid2, .flow { grid-template-columns: minmax(0, 1fr); }
  .flow li::after { display: none; }
  section.band { padding: 64px 0; }
}