/* The landing page and the manual. They share the app's palette so that
   opening the app from either does not feel like changing rooms. */
:root {
  --bg: #faf8f4;
  --card: #fffdfa;
  --ink: #23201c;
  --muted: #857c70;
  --line: #e6e0d6;
  --accent: #a4622f;
  --accent-soft: #f4e7dc;
  --warn: #b3502f;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161513;
    --card: #1e1c19;
    --ink: #ece7df;
    --muted: #9b938a;
    --line: #2e2b27;
    --accent: #d79a68;
    --accent-soft: #302722;
    --warn: #e0866a;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  -webkit-text-size-adjust: 100%;
}
img { max-width: 100%; }
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.35; letter-spacing: 0.01em; }
h2 { font-size: 1.5rem; margin: 0 0 12px; }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
p { margin: 0 0 12px; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--accent-soft);
  border-radius: 5px;
  padding: 1px 5px;
}
pre {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  overflow-x: auto;
}
pre code { background: none; padding: 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.94rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.82rem; }
.table-scroll { overflow-x: auto; }

/* One language at a time. Both are in the document, so the page also reads
   without JavaScript - then it shows both. */
[data-lang="ja"] .en, [data-lang="en"] .ja { display: none !important; }

/* Header */
.site-head {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-head-row {
  max-width: 1040px;
  margin: 0 auto;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 8px; font-weight: 700; color: inherit; text-decoration: none; letter-spacing: 0.02em; }
.brand-mark { width: 24px; height: 24px; border-radius: 6px; }
.spacer { margin-left: auto; }
.site-nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 0.9rem; padding: 4px 10px; border-radius: 999px; }
.site-nav a:hover { color: var(--accent); background: var(--accent-soft); }

/* Language switch */
.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--card);
}
.lang-switch button {
  font: inherit;
  font-size: 0.82rem;
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 4px 11px;
  cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: inherit;
  font-size: 0.96rem;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: inherit;
  padding: 9px 18px;
  cursor: pointer;
}
.button:hover { border-color: var(--accent); color: var(--accent); }
.button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.button.primary:hover { color: #fff; filter: brightness(1.05); }
.button.small { font-size: 0.86rem; padding: 6px 13px; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Landing page */
.lp main { max-width: 1040px; margin: 0 auto; padding: 0 16px 64px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  padding: 56px 0 40px;
}
.hero h1 { font-size: clamp(2rem, 4.6vw, 3rem); margin: 0 0 8px; }
.hero .lede { font-size: 1.12rem; color: var(--muted); margin-bottom: 20px; }
.kicker { color: var(--accent); font-size: 0.86rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 6px; }
.shot {
  display: block;
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.12);
  background: var(--card);
}
.shot img { display: block; border-radius: 16px; width: 100%; }
/* The captures are phone screens, and read best at phone size. */
.shot { max-width: 390px; margin: 0 auto; }
/* The captures are whole screens and tall. A landing page needs the part that
   tells the story, so they are cropped to a window: the hero shows the top of
   the timeline, and a feature shows the sheet that opened at the bottom. */
.shot.crop-top img, .shot.crop-bottom img { max-height: 560px; object-fit: cover; }
.shot.crop-top img { object-position: top; }
.shot.crop-bottom img { object-position: bottom; }
.section { padding: 40px 0; border-top: 1px solid var(--line); }
.section-intro { color: var(--muted); max-width: 640px; }
/* Why it was made: a short story, read at column width, with one line held up. */
.why p { max-width: 640px; }
.pull {
  margin: 20px 0 24px;
  padding: 0;
  border: none;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--accent);
}
.how-note { color: var(--muted); max-width: 640px; margin: 16px 0 0; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 20px; counter-reset: step; }
.step {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 8px;
}
.step h3 { margin: 0 0 4px; }
.step p { margin: 0; color: var(--muted); font-size: 0.94rem; }
.feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 32px;
  align-items: center;
  padding: 28px 0;
}
.feature.flip .feature-text { order: 2; }
.feature h3 { font-size: 1.3rem; margin: 0 0 8px; }
.feature p { color: var(--muted); }
.feature blockquote {
  margin: 12px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--accent);
  background: var(--card);
  border-radius: 0 10px 10px 0;
  color: var(--ink);
  font-size: 0.96rem;
}
.cards { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-top: 20px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
}
.card .who { font-weight: 700; }
.card .tag { color: var(--accent); font-size: 0.8rem; margin-left: 6px; }
.card p { margin: 6px 0 0; color: var(--muted); font-size: 0.92rem; }
.models { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 6px; }
.models li { padding-left: 16px; position: relative; color: var(--muted); }
.models li::before { content: ""; position: absolute; left: 0; top: 0.75em; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
.cta {
  margin-top: 40px;
  padding: 36px 28px;
  border-radius: 20px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  text-align: center;
}
.cta h2 { margin-bottom: 8px; }
.cta p { color: var(--muted); }
.cta .actions { justify-content: center; }
.site-foot {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
}
.site-foot-row { max-width: 1040px; margin: 0 auto; padding: 20px 16px; display: flex; gap: 16px; flex-wrap: wrap; }
.site-foot a { color: inherit; }

/* Manual */
.manual main {
  max-width: 1040px;
  margin: 0 auto;
  padding: 24px 16px 64px;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

[data-guide="beginner"] .advanced-guide,
[data-guide="advanced"] .beginner-guide {
  display: none;
}
.toc {
  position: sticky;
  top: 64px;
  font-size: 0.9rem;
}
.toc ol { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.toc a { color: var(--muted); text-decoration: none; display: block; padding: 4px 10px; border-left: 2px solid var(--line); }
.toc a:hover { color: var(--accent); border-left-color: var(--accent); }
.toc-title { font-size: 0.78rem; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 8px 12px; }
.doc { min-width: 0; }
.doc h1 { font-size: 2rem; margin: 0 0 4px; }
.doc .lede { color: var(--muted); font-size: 1.05rem; margin-bottom: 24px; }
.doc section { padding: 24px 0; border-top: 1px solid var(--line); }
.doc section:first-of-type { border-top: none; padding-top: 8px; }
.doc h2, .doc h3[id], .lp section[id] { scroll-margin-top: 72px; }
.doc figure { margin: 16px 0; }
/* The captures are phone screens; blown up to the column they go soft. */
.doc figure img { display: block; width: 100%; max-width: 390px; margin: 0 auto; border-radius: 12px; border: 1px solid var(--line); }
.doc figcaption { color: var(--muted); font-size: 0.84rem; margin-top: 6px; }
.doc ul, .doc ol { padding-left: 1.3em; }
.doc li { margin: 2px 0; }
.tip {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 0.95rem;
}
.tip p:last-child { margin-bottom: 0; }
.faq dt { font-weight: 600; margin-top: 14px; }
.faq dd { margin: 4px 0 0; color: var(--muted); }
kbd {
  font-family: inherit;
  font-size: 0.86em;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 5px;
  background: var(--card);
}

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 32px; }
  .steps { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; gap: 16px; padding: 20px 0; }
  .feature.flip .feature-text { order: 0; }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .manual main { grid-template-columns: 1fr; gap: 20px; }
  .toc { position: static; }
  .toc ol { display: flex; flex-wrap: wrap; gap: 4px; }
  .toc a { border-left: none; border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; }
}
@media (max-width: 480px) {
  .cards { grid-template-columns: 1fr; }
  .site-nav a { padding: 4px 7px; font-size: 0.86rem; }
}