/* わけわけ サイト共通スタイル
   色・書体は Android アプリのスタイルガイドに合わせている。 */

:root {
  color-scheme: light;

  --primary: #2563EB;
  --primary-deep: #1D4ED8;
  --primary-tint: #E8F0FF;
  --action: #EA580C;
  --action-shadow: #9A3412;
  --primary-shadow: #1E40AF;

  --ink: #1B2340;
  --ink-muted: #3B4560;
  --ink-sub: #5B6478;

  --ground: #F4F6FB;
  --surface: #FFFFFF;
  --line: #DDE3EE;
  --line-soft: #E3E8F2;

  --rounded: "M PLUS Rounded 1c", "Hiragino Maru Gothic ProN", sans-serif;
  --body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", sans-serif;

  --page: 1040px;
  --radius: 22px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--rounded);
  font-weight: 800;
  line-height: 1.4;
  margin: 0;
  text-wrap: balance;
}

a { color: var(--primary-deep); }
a:hover { color: var(--primary-shadow); }

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap {
  width: 100%;
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: 20px;
}

/* --- ヘッダー --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(244, 246, 251, .88);
  backdrop-filter: blur(10px);
  border-bottom: 1.5px solid var(--line-soft);
}

.site-header > .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--rounded);
  font-weight: 800;
  font-size: 22px;
  color: var(--ink);
  text-decoration: none;
}

.brand img { width: 34px; height: 34px; }

.site-nav {
  display: flex;
  gap: 4px;
  font-size: 15px;
}

.site-nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding-inline: 12px;
  border-radius: 12px;
  font-weight: 700;
  text-decoration: none;
}

.site-nav a:hover { background: var(--primary-tint); }
.site-nav a[aria-current="page"] { background: var(--primary-tint); color: var(--primary-deep); }

/* --- ヒーロー --- */

.hero { padding-block: 64px 48px; }

.hero > .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 48px;
  align-items: center;
}

.hero h1 { font-size: clamp(32px, 6vw, 48px); }

.hero p.lead {
  margin: 20px 0 0;
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--ink-sub);
}

.hero-art {
  background: var(--surface);
  border: 1.5px solid var(--line-soft);
  border-radius: 32px;
  padding: 24px;
}

.hero-art svg { display: block; width: 100%; height: auto; }

/* --- ボタン --- */

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 16px;
  margin-top: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 60px;
  padding-inline: 28px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--rounded);
  font-weight: 800;
  font-size: 19px;
  text-decoration: none;
  transition: transform .08s ease, box-shadow .08s ease;
}

.btn-primary {
  background: var(--action);
  color: #FFFFFF;
  box-shadow: 0 5px 0 var(--action-shadow);
}

.btn-primary:hover { color: #FFFFFF; }

.btn-primary:active {
  transform: translateY(4px);
  box-shadow: 0 1px 0 var(--action-shadow);
}

.btn-quiet {
  background: var(--surface);
  color: var(--primary-deep);
  border: 2px solid var(--primary);
  box-shadow: 0 5px 0 #BFCBE3;
}

.btn-quiet:active {
  transform: translateY(4px);
  box-shadow: 0 1px 0 #BFCBE3;
}

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

/* --- セクション --- */

section.band { padding-block: 56px; }
section.band.on-surface { background: var(--surface); border-block: 1.5px solid var(--line-soft); }

section.band h2 {
  font-size: clamp(24px, 4vw, 30px);
  margin-bottom: 8px;
}

section.band > .wrap > p.section-lead {
  margin: 0 0 32px;
  color: var(--ink-sub);
}

.grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  background: var(--surface);
  border: 1.5px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 24px;
}

section.on-surface .card { background: var(--ground); }

.card h3 { font-size: 19px; }
.card p { margin: 8px 0 0; color: var(--ink-sub); font-size: 15px; }

/* 使い方のステップ */

.steps { counter-reset: step; }

.steps .card::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 14px;
  border-radius: 14px;
  background: var(--primary);
  color: #FFFFFF;
  font-family: var(--rounded);
  font-weight: 800;
  font-size: 21px;
}

/* 利用シーン */

.scenes { gap: 14px; }

.scenes .card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
}

.scenes .scene-tag {
  font-family: var(--rounded);
  font-weight: 800;
  font-size: 15px;
  color: var(--primary-deep);
}

.scenes .scene-quote { font-size: 17px; color: var(--ink); }

/* --- 記事ページ --- */

.doc { padding-block: 48px 64px; }

.doc > .wrap { max-width: 760px; }

.doc h1 { font-size: clamp(28px, 5vw, 36px); }

.doc .updated {
  margin: 12px 0 40px;
  font-size: 14px;
  color: var(--ink-sub);
}

.doc h2 {
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1.5px solid var(--line-soft);
  font-size: 21px;
}

.doc h3 { margin-top: 28px; font-size: 17px; }

.doc p, .doc li { color: var(--ink-muted); }

.doc ul, .doc ol { padding-left: 1.4em; }

.doc li { margin-block: 6px; }

.callout {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--primary-tint);
  border-radius: var(--radius);
}

.callout p { margin: 0; color: var(--ink); font-weight: 700; }

.toc {
  margin: 0 0 8px;
  padding: 20px 24px;
  background: var(--surface);
  border: 1.5px solid var(--line-soft);
  border-radius: var(--radius);
}

.toc ol { margin: 0; }
.toc li { color: var(--ink-sub); }

.fill-me {
  padding: 2px 8px;
  border-radius: 6px;
  background: #FEF3C7;
  color: #92400E;
  font-weight: 700;
  font-size: .95em;
}

/* --- フッター --- */

.site-footer {
  padding-block: 40px 56px;
  background: var(--surface);
  border-top: 1.5px solid var(--line-soft);
  font-size: 15px;
}

.site-footer > .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
  justify-content: space-between;
}

.site-footer nav { display: flex; flex-wrap: wrap; gap: 4px; }

.site-footer nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding-inline: 12px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
}

.site-footer nav a:hover { background: var(--primary-tint); }

.copyright { color: var(--ink-sub); }

/* --- 狭い画面 --- */

@media (max-width: 860px) {
  .hero { padding-block: 40px 32px; }
  .hero > .wrap { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .hero-art { order: -1; padding: 16px; border-radius: 26px; }
  section.band { padding-block: 44px; }
}

@media (max-width: 420px) {
  .actions .btn { width: 100%; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}