:root {
  --ink: #23303f;
  --ink-soft: #4a5563;
  --muted: #6b7280;
  --paper: #f6f3ec;
  --card: #fffdf8;
  --line: #e2dacb;
  --sand: #ede7da;
  --blue: #2d5f9a;
  --orange: #b4541a;
  --orange-soft: #f0a868;
  --ok: #2f7d4f;
  --radius: 16px;
  --display: 'Zen Maru Gothic', 'Noto Sans JP', sans-serif;
  --body: 'Noto Sans JP', system-ui, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.75;
}
a { color: var(--blue); }
img { max-width: 100%; }
.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }

.proto-bar {
  background: var(--ink); color: #f6f3ec; font-size: 13px; text-align: center; padding: 6px 12px;
}
.proto-bar b { color: var(--orange-soft); }

header.site { padding: 20px 0 8px; }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.logo { font-family: var(--display); font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
.logo small { display: block; font-size: 12px; color: var(--muted); font-family: var(--body); font-weight: 400; }
nav.top a { margin-left: 14px; font-size: 14px; text-decoration: none; color: var(--ink-soft); }
nav.top a:hover { color: var(--blue); }

h1, h2, h3 { font-family: var(--display); line-height: 1.35; margin: 0 0 12px; }
h1 { font-size: 28px; }
h2 { font-size: 22px; margin-top: 36px; }
h3 { font-size: 18px; }
.eyebrow { color: var(--orange); font-weight: 700; font-size: 13px; letter-spacing: .06em; margin: 0 0 4px; }
.lead { color: var(--ink-soft); }
.muted { color: var(--muted); font-size: 14px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px 20px; margin: 12px 0;
}
.card h3 { margin-bottom: 6px; }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.pill { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; background: var(--sand); color: var(--ink-soft); }
.pill.blue { background: #dfe9f5; color: var(--blue); }
.pill.orange { background: #fbe6d7; color: var(--orange); }
.pill.ok { background: #dcefe3; color: var(--ok); }

.date-block { display: flex; gap: 14px; align-items: center; }
.date-block .d { min-width: 64px; text-align: center; background: var(--ink); color: #f6f3ec; border-radius: 12px; padding: 6px 4px; line-height: 1.2; }
.date-block .d b { display: block; font-size: 22px; font-family: var(--display); }
.date-block .d span { font-size: 12px; }

button, .btn {
  font: inherit; font-weight: 700; border: 0; border-radius: 999px; padding: 10px 18px;
  background: var(--blue); color: #fff; cursor: pointer; text-decoration: none; display: inline-block;
}
button.secondary, .btn.secondary { background: var(--sand); color: var(--ink); }
button.warn { background: var(--orange); }
button:disabled { opacity: .5; cursor: not-allowed; }
button:focus-visible, .btn:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 3px solid var(--orange-soft); outline-offset: 2px; }

label { display: block; font-weight: 700; font-size: 14px; margin: 14px 0 4px; }
label small { font-weight: 400; color: var(--muted); }
input, textarea, select {
  width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
textarea { min-height: 84px; }

.notice { background: #fbe6d7; border-left: 4px solid var(--orange); padding: 10px 14px; border-radius: 8px; margin: 12px 0; font-size: 14px; }
.notice.info { background: #dfe9f5; border-left-color: var(--blue); }
.error { color: #a1300f; font-weight: 700; }

ul.rules { padding-left: 1.2em; margin: 6px 0; }
footer.site { margin: 48px 0 32px; color: var(--muted); font-size: 13px; text-align: center; }

/* タイマー */
.timer-box { background: var(--ink); color: #f6f3ec; border-radius: 20px; padding: 22px 18px; text-align: center; }
.timer-phase { font-size: 15px; color: #c9d2dc; }
.timer-phase b { color: var(--orange-soft); font-size: 18px; }
.timer-digits { font-family: var(--display); font-weight: 700; font-size: clamp(64px, 20vw, 140px); line-height: 1.05; font-variant-numeric: tabular-nums; margin: 6px 0; }
.timer-digits.over { color: var(--orange-soft); }
.timer-state { font-size: 15px; min-height: 1.6em; }
.timer-range { background: #2e3d4f; border-radius: 12px; padding: 10px 14px; margin-top: 12px; text-align: left; font-size: 15px; }
.stale { background: #fbe6d7; color: #7a3410; border-radius: 10px; padding: 8px 12px; margin-top: 10px; font-size: 14px; font-weight: 700; }
.phase-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin-top: 12px; }
.phase-list .ph { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; font-size: 14px; }
.phase-list .ph.now { border: 2px solid var(--blue); }
.host-panel { border: 2px dashed var(--blue); }
.host-panel .row button { flex: 1 1 auto; }

/* 読書会のすすめ */
.hero { background: radial-gradient(circle at 80% 20%, #3a4b60, #1b2531 70%); color: #f6f3ec; padding: 56px 0 48px; }
.hero .eyebrow { color: var(--orange-soft); }
.hero h1 { font-size: clamp(30px, 7vw, 48px); color: #fffaf0; }
.hero p { color: #d5dde6; max-width: 640px; }
.era { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 24px 0; }
.era .card { margin: 0; }
.era .year { font-family: var(--display); font-size: 26px; color: var(--orange); font-weight: 700; }
.quote { font-family: var(--display); font-size: 20px; border-left: 4px solid var(--orange); padding: 6px 0 6px 16px; margin: 18px 0; }
.voice { background: var(--card); border-radius: 18px; border: 1px solid var(--line); padding: 16px 18px; position: relative; }
.voice::before { content: '“'; position: absolute; top: -10px; left: 14px; font-size: 48px; color: var(--orange-soft); font-family: Georgia, serif; }
.cta { background: var(--sand); border-radius: 20px; padding: 24px; text-align: center; margin: 32px 0; }
.sources { font-size: 13px; color: var(--muted); }
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.shown { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }