/* 日本ソテツ研究会 Japan Cycad Society */

:root {
  --paper: #f6f3ea;
  --paper-2: #ece6d6;
  --ink: #1f2a22;
  --ink-soft: #4a5a4e;
  --green: #2f5a3c;
  --green-deep: #1d3a27;
  --rule: #d6ceb9;
  --accent: #8a6d2f;
  --serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
[id] { scroll-margin-top: 110px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.9;
}
img { max-width: 100%; height: auto; }
a { color: var(--green); text-underline-offset: 3px; }
a:hover { color: var(--green-deep); }

/* 言語の切り替え */
html[data-lang="ja"] [data-l="en"],
html[data-lang="en"] [data-l="ja"] { display: none !important; }

/* ヘッダー */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky; top: 0; z-index: 10;
}
.header-inner {
  max-width: 1080px; margin: 0 auto;
  padding: 10px 20px;
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand img { width: 120px; display: block; }
.brand span { font-family: var(--serif); font-size: 15px; font-weight: 600; letter-spacing: .06em; white-space: nowrap; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-left: auto; font-size: 14px; }
.site-nav a { color: var(--ink-soft); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover { color: var(--green-deep); }
.site-nav a[aria-current="page"] { color: var(--green-deep); border-bottom-color: var(--green); }

.lang-switch { display: flex; border: 1px solid var(--rule); border-radius: 999px; overflow: hidden; }
.lang-switch button {
  font: 12px/1 var(--sans); letter-spacing: .08em;
  padding: 7px 11px; border: 0; background: transparent; color: var(--ink-soft); cursor: pointer;
}
.lang-switch button[aria-pressed="true"] { background: var(--green); color: #fff; }

/* トップ */
.hero {
  text-align: center;
  padding: 72px 20px 56px;
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(ellipse at 50% 0%, rgba(47,90,60,.08), transparent 70%),
    var(--paper);
}
.hero-logo { width: min(520px, 88vw); }
.hero-name { font-family: var(--serif); font-size: 22px; letter-spacing: .3em; margin: 14px 0 0; }
.hero-lead { max-width: 640px; margin: 22px auto 0; color: var(--ink-soft); font-size: 15px; }

/* 本文 */
.page { max-width: 760px; margin: 0 auto; padding: 48px 20px 80px; }
.page-title { font-family: var(--serif); font-size: 30px; line-height: 1.5; margin: 0 0 6px; color: var(--green-deep); }
.page-sub { color: var(--ink-soft); margin: 0 0 36px; font-size: 14px; }
.page h2 {
  font-family: var(--serif); font-size: 22px; color: var(--green-deep);
  margin: 56px 0 14px; padding-top: 18px; border-top: 1px solid var(--rule);
}
.page h3 { font-family: var(--serif); font-size: 18px; margin: 32px 0 8px; }
.page p { margin: 0 0 1.1em; }
.page ul, .page ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.page li { margin: .2em 0; }
.toc { background: var(--paper-2); border-radius: 6px; padding: 14px 20px; margin: 0 0 32px; font-size: 14px; }
.toc ol { margin: 0; }
.note { background: var(--paper-2); border-left: 3px solid var(--accent); padding: 12px 16px; font-size: 14px; color: var(--ink-soft); margin: 0 0 1.4em; }
.byline { font-size: 13px; color: var(--ink-soft); margin: -4px 0 20px; }

dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 20px; margin: 0 0 1.4em; }
dl.facts dt { color: var(--ink-soft); font-size: 14px; }
dl.facts dd { margin: 0; }

.timeline { border-left: 2px solid var(--rule); padding-left: 20px; margin: 0 0 1.4em; }
.timeline h3 { margin-top: 24px; position: relative; }
.timeline h3::before {
  content: ""; position: absolute; left: -27px; top: .55em;
  width: 10px; height: 10px; border-radius: 50%; background: var(--green);
}

.refs { font-size: 13px; line-height: 1.7; color: var(--ink-soft); padding-left: 2em; }
.refs li { margin-bottom: .8em; word-break: break-word; }
sup a { text-decoration: none; font-size: 11px; }

/* カード */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 0 0 1.4em; }
.card {
  display: block; background: #fff; border: 1px solid var(--rule); border-radius: 8px;
  padding: 18px 20px; text-decoration: none; color: var(--ink);
}
a.card:hover { border-color: var(--green); color: var(--ink); }
.card h3 { margin: 0 0 6px; font-size: 17px; color: var(--green-deep); }
.card p { margin: 0; font-size: 14px; color: var(--ink-soft); line-height: 1.7; }

.officers { display: grid; gap: 16px; }
.officers .card .role { font-size: 13px; color: var(--accent); letter-spacing: .1em; margin: 0 0 4px; }
.officers .card .name { font-family: var(--serif); font-size: 20px; margin: 0; color: var(--ink); }
.officers .card .name small { font-family: var(--sans); font-size: 13px; color: var(--ink-soft); margin-left: 8px; }

.contact-box { text-align: center; background: var(--green-deep); color: #e9efe6; padding: 40px 20px; border-radius: 8px; margin-top: 56px; }
.contact-box p { margin: 0 0 8px; }
.contact-box a { color: #fff; font-size: 20px; font-family: var(--serif); }

/* 写真 */
.figs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 0 0 8px; }
.figs.one { grid-template-columns: 1fr; }
.figs.three { grid-template-columns: repeat(3, 1fr); }
.figs img { width: 100%; height: 100%; object-fit: cover; border-radius: 4px; display: block; aspect-ratio: 3 / 4; }
.figs.wide img { aspect-ratio: 3 / 2; }
.figcap { font-size: 13px; color: var(--ink-soft); margin: 0 0 1.6em; }

/* 表 */
.table-wrap { overflow-x: auto; margin: 0 0 1.4em; }
table.data { border-collapse: collapse; width: 100%; font-size: 14px; background: #fff; }
table.data th, table.data td { border: 1px solid var(--rule); padding: 8px 12px; text-align: left; }
table.data th { background: var(--paper-2); font-weight: 600; }
table.data .num { text-align: right; font-variant-numeric: tabular-nums; }

/* ボタン */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--green); color: #fff; text-decoration: none;
  padding: 10px 20px; border-radius: 999px; font-size: 14px;
}
.btn:hover { background: var(--green-deep); color: #fff; }
.btn small { opacity: .8; font-size: 12px; }
.report-meta { font-size: 14px; color: var(--accent); margin: 0 0 6px; letter-spacing: .04em; }
.report-actions { margin: 8px 0 36px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

/* 活動報告の一覧 */
.report-list { display: grid; gap: 16px; }
.report-card { display: grid; grid-template-columns: 180px 1fr; gap: 0; padding: 0; overflow: hidden; }
.report-card img { width: 100%; height: 100%; object-fit: cover; display: block; min-height: 140px; }
.report-card .body { padding: 16px 20px; }

/* フッター */
.site-footer { border-top: 1px solid var(--rule); text-align: center; padding: 32px 20px 40px; font-size: 13px; color: var(--ink-soft); }
.site-footer img { width: 140px; opacity: .8; }
.site-footer p { margin: 8px 0 0; }

@media (max-width: 960px) {
  .brand span { display: none; }
  .brand img { width: 100px; }
  .header-inner { gap: 8px 12px; }
  .site-nav { gap: 4px 12px; font-size: 13px; }
}

@media (max-width: 640px) {
  .site-header { position: static; }
  [id] { scroll-margin-top: 16px; }
  .header-inner { padding: 10px 16px; gap: 8px 12px; }
  .brand img { width: 96px; }
  .brand span { display: none; }
  .site-nav { order: 3; width: 100%; margin-left: 0; gap: 2px 14px; font-size: 13px; }
  .lang-switch { margin-left: auto; }
  .page { padding: 32px 16px 64px; }
  .page-title { font-size: 25px; }
  .hero { padding: 48px 16px 40px; }
  .hero-lead br { display: none; }
  .hero-name { font-size: 18px; letter-spacing: .2em; }
  dl.facts { grid-template-columns: 1fr; gap: 0; }
  dl.facts dd { margin-bottom: 10px; }
  .figs.three { grid-template-columns: repeat(2, 1fr); }
  .report-card { grid-template-columns: 1fr; }
  .report-card img { aspect-ratio: 16 / 9; min-height: 0; }
}