:root {
  --bg: #faf7f2;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #6b6b6b;
  --accent: #ff8a3d;
  --accent-soft: #fff1e6;
  --border: #ece6dd;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

header {
  background: linear-gradient(135deg, #ffb070, #ff8a3d);
  color: #fff;
  padding: 28px 20px;
  text-align: center;
}

header .app-name {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  margin: 0;
}

header .app-sub {
  margin: 6px 0 0;
  font-size: 0.9rem;
  opacity: 0.95;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 18px 64px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.04);
}

h1.page-title {
  font-size: 1.4rem;
  margin: 0 0 4px;
}

.updated {
  color: var(--muted);
  font-size: 0.82rem;
  margin: 0 0 24px;
}

h2 {
  font-size: 1.05rem;
  margin: 28px 0 8px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

p, li { font-size: 0.95rem; color: var(--text); }
.muted { color: var(--muted); font-size: 0.85rem; }

ul { padding-left: 1.3em; }
li { margin-bottom: 6px; }

.toc {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.toc a {
  display: block;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  color: var(--text);
  font-weight: 600;
}

.toc a:hover { border-color: var(--accent); text-decoration: none; }
.toc a span { display: block; font-size: 0.8rem; color: var(--muted); font-weight: 400; margin-top: 2px; }

.back {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 0.9rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 24px 16px 40px;
}

.contact {
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 16px 18px;
  margin-top: 20px;
  font-size: 0.9rem;
}