/* kairanban-app 紹介サイト 共通スタイル
   実際のアプリの配色(緑 #0a7a3d)を引き継ぎつつ、回覧板らしい紙と朱印のモチーフを添える。 */

:root {
  --paper: #f6f2e7;
  --paper-deep: #efe8d8;
  --card: #fffdf8;
  --ink: #23241d;
  --ink-soft: #52544a;
  --muted: #6f6d5e;
  --border: #e2dbc7;
  --pine: #0a7a3d;
  --pine-deep: #075c2e;
  --pine-pale: #e3f2e8;
  --hanko: #b3372c;
  --hanko-pale: #fbeae7;
  --gold: #866017;
  --gold-pale: #fbf1dc;
  --shadow: 0 1px 2px rgba(35, 36, 29, 0.06), 0 8px 24px rgba(35, 36, 29, 0.08);
  --radius: 16px;
  /* ⚠ 常に一定の値(明暗テーマで変えない)。白文字を乗せるボタンや丸バッジの背景専用。
     --pine は明暗で色味が変わるため、白文字の背景に使うとダークモードでコントラスト不足になる。 */
  --pine-solid: #0a7a3d;
  --pine-solid-deep: #075c2e;
  --font-jp: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", sans-serif;
  --font-display: "Fraunces", var(--font-jp), serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

:root[data-theme="dark"] {
  --paper: #17190f;
  --paper-deep: #1e2013;
  --card: #20221a;
  --ink: #eeeadb;
  --ink-soft: #c7c3ac;
  --muted: #8d8a76;
  --border: #34351f;
  --pine: #4caf7d;
  --pine-deep: #7cd3a6;
  --pine-pale: #1c2b1f;
  --hanko: #e2685a;
  --hanko-pale: #2c1c19;
  --gold: #e0b656;
  --gold-pale: #2c2413;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #17190f;
    --paper-deep: #1e2013;
    --card: #20221a;
    --ink: #eeeadb;
    --ink-soft: #c7c3ac;
    --muted: #8d8a76;
    --border: #34351f;
    --pine: #4caf7d;
    --pine-deep: #7cd3a6;
    --pine-pale: #1c2b1f;
    --hanko: #e2685a;
    --hanko-pale: #2c1c19;
    --gold: #e0b656;
    --gold-pale: #2c2413;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 32px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-jp);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 15% 8%, rgba(10, 122, 61, 0.05), transparent 40%),
    radial-gradient(circle at 85% 92%, rgba(179, 55, 44, 0.04), transparent 45%);
}

img { max-width: 100%; display: block; }
a { color: var(--pine-deep); }

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}
.wrap-narrow {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- ヘッダー ---------- */
.site-header {
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  font-size: 17px;
}
.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--pine-solid);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}
.site-nav {
  display: flex;
  gap: 18px;
  font-size: 14.5px;
  font-weight: 700;
}
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover { color: var(--pine-deep); }

/* ---------- 見出し ---------- */
h1, h2, h3 { line-height: 1.4; text-wrap: balance; margin: 0; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  font-weight: 600;
  color: var(--pine-deep);
  background: var(--pine-pale);
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 999px;
}
.eyebrow.hanko { color: var(--hanko); background: var(--hanko-pale); }
.eyebrow.gold { color: var(--gold); background: var(--gold-pale); }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 26px;
  border-radius: 12px;
  font-weight: 800;
  font-size: 16px;
  text-decoration: none;
  border: 2px solid transparent;
  cursor: pointer;
  min-height: 52px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--pine-solid); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--pine-solid-deep); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--pine); color: var(--pine-deep); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- カード ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- フッター ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 0 60px;
  margin-top: 60px;
  color: var(--muted);
  font-size: 14.5px;
}
.site-footer a { color: var(--ink-soft); }
.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  font-weight: 700;
}