:root {
  --bg: #FBF7EF;
  --surface: #FFFFFF;
  --text: #241F1A;
  --muted: #6B5F52;
  --line: #E2D8C6;
  --accent: #4A2F28;
  --lamp: #D9A825;
  --tr-ink: #241F1A;
  --tr-body: #4A2F28;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17140F;
    --surface: #201C16;
    --text: #EFE6D3;
    --muted: #A8998A;
    --line: #352E25;
    --accent: #C9A88F;
    --lamp: #D9A825;
    /* 暗い背景では黒い線と車体が沈むので、アプリのヘッダと同じ明るい版に差し替える */
    --tr-ink: #9C8A72;
    --tr-body: #6B4438;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1.25rem 4rem;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.85;
  -webkit-text-size-adjust: 100%;
}

.wrap { max-width: 40rem; margin: 0 auto; }

header { padding: 2.5rem 0 1.25rem; }

.brand { display: flex; align-items: center; gap: .75rem; }
.brand svg { flex: 0 0 auto; }
.train .ink { fill: var(--tr-ink); }
.train .ink-stroke { stroke: var(--tr-ink); fill: none; }
.train .car { fill: var(--tr-body); stroke: var(--tr-ink); }
.train .win { fill: #E8DCC0; }
.train .lamp { fill: #D9A825; }
.brand h1 { font-size: 1.75rem; margin: 0; letter-spacing: .02em; }

.sub { color: var(--muted); font-size: .95rem; margin: .25rem 0 0; }

.notice {
  margin: 1.5rem 0;
  padding: .9rem 1.1rem;
  border: 1px solid var(--line);
  border-left: 4px solid var(--lamp);
  border-radius: 8px;
  background: var(--surface);
  font-size: .95rem;
}

h2 {
  font-size: 1.2rem;
  margin: 2.5rem 0 .6rem;
  padding-bottom: .4rem;
  border-bottom: 1px solid var(--line);
}

h3 { font-size: 1rem; margin: 1.6rem 0 .3rem; }

p, li { font-size: 1rem; }
ul { padding-left: 1.3rem; }
li { margin: .4rem 0; }

dl { margin: 0; }
dt { font-weight: 600; margin-top: 1.4rem; }
dd { margin: .2rem 0 0; color: var(--text); }

a { color: var(--accent); text-underline-offset: 2px; }

footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

footer a { margin-right: 1rem; }