/* =====================================================================
   氷川台ドットコム  公開フロント スタイル
   モバイルファースト / アクセシビリティ重視 / 落ち着いた配色
   ===================================================================== */

:root {
  --c-bg: #fbfaf6;
  --c-fg: #1f2421;
  --c-muted: #5d6863;
  --c-line: #e5e2d8;
  --c-accent: #1a4d3a;     /* 深緑 */
  --c-accent-soft: #e8f0eb;
  --c-warm: #b96a3e;        /* 赤橙 */
  --c-warn: #c25d2c;
  --c-danger: #c1443f;
  --c-card: #ffffff;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --max-w: 880px;
  --font: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "ヒラギノ角ゴシック", "Yu Gothic UI", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; }

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

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--c-accent); color: #fff; padding: 8px 12px;
}
.skip-link:focus { left: 8px; top: 8px; z-index: 100; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 16px; }

/* ヘッダー */
.site-header {
  background: var(--c-card);
  border-bottom: 1px solid var(--c-line);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(6px);
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 60px; gap: 16px; flex-wrap: wrap;
}
.brand {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--c-fg); font-weight: 700;
}
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--c-accent); color: #fff; font-weight: 700;
}
.brand-text { font-size: 17px; }
.site-nav {
  display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  font-size: 15px;
}
.site-nav a { text-decoration: none; color: var(--c-fg); }
.site-nav a:hover { color: var(--c-accent); }
.site-nav .nav-cta {
  background: var(--c-accent); color: #fff; padding: 6px 12px;
  border-radius: var(--radius);
}
.site-nav .nav-cta:hover { background: #163e2f; color: #fff; }

main.main { padding: 24px 16px 64px; }

/* ヒーロー */
.hero {
  padding: 32px 0 16px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 24px;
}
.hero h1 {
  font-size: 28px; line-height: 1.45;
  margin: 0 0 12px; letter-spacing: .02em;
}
.hero .lead { color: var(--c-muted); margin: 0; }

.lead { font-size: 17px; color: var(--c-muted); margin: 0 0 16px; }
.lead-sm { color: var(--c-muted); margin: 0 0 16px; }
.empty { color: var(--c-muted); }

/* セクションブロック */
.block { margin: 28px 0; }
.block-head { display: flex; align-items: baseline; justify-content: space-between; }
.block-head h2 { margin: 0 0 12px; font-size: 20px; }
.block-more { font-size: 14px; }
.intro-block { background: var(--c-accent-soft); padding: 20px; border-radius: var(--radius); }
.intro-block h2 { margin-top: 0; }
.link-arrow { font-weight: 700; }

/* カードリスト */
.card-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 14px;
}
@media (min-width: 640px) { .card-list { grid-template-columns: repeat(2, 1fr); } }
.card {
  background: var(--c-card);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 16px 16px 14px;
  box-shadow: var(--shadow-sm);
}
.card h2, .card h3 { margin: 0 0 6px; font-size: 17px; line-height: 1.4; }
.card h2 a, .card h3 a { text-decoration: none; color: var(--c-fg); }
.card h2 a:hover, .card h3 a:hover { color: var(--c-accent); text-decoration: underline; }
.card p { margin: 0 0 6px; color: var(--c-fg); font-size: 15px; }
.card .meta { color: var(--c-muted); font-size: 13px; }
.card-list.muted .card { background: #f4f2eb; }

/* 単一記事 */
.post { background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--radius); padding: 24px; }
.post h1 { font-size: 26px; line-height: 1.4; margin: 0 0 8px; }
.post h2 { margin-top: 28px; font-size: 19px; }
.post .body p { margin: 0 0 1em; }
.post .meta { color: var(--c-muted); font-size: 14px; margin: 0 0 16px; }
.post .breadcrumb { font-size: 13px; color: var(--c-muted); margin: 0 0 12px; }
.post .breadcrumb a { color: var(--c-muted); }
.post .source-link { margin-top: 24px; }
.post .back-link { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--c-line); }

/* イベントメタ */
.event-meta { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 16px 0; }
.event-meta dt { font-weight: 700; color: var(--c-muted); }
.event-meta dd { margin: 0; }

/* フォーム */
.form { display: flex; flex-direction: column; gap: 14px; }
.form .field { display: flex; flex-direction: column; gap: 6px; }
.form fieldset.field { border: 1px solid var(--c-line); padding: 12px 16px; border-radius: var(--radius); }
.form legend { font-weight: 700; padding: 0 8px; }
.form label { font-weight: 600; }
.form .req { color: var(--c-danger); }
.form .hint { color: var(--c-muted); font-size: 13px; margin: -2px 0 0; }
.form input[type=text], .form input[type=email], .form input[type=url],
.form input[type=password], .form input[type=datetime-local],
.form select, .form textarea {
  width: 100%; padding: 8px 10px; border: 1px solid #c8c4b6;
  border-radius: var(--radius); font: inherit; background: #fff;
}
.form input:focus, .form select:focus, .form textarea:focus {
  outline: 2px solid var(--c-accent); outline-offset: 1px;
}
.form .radio, .form .check { display: flex; align-items: flex-start; gap: 8px; font-weight: 400; }
.form .radio input, .form .check input { margin-top: 4px; }
.form-error { color: var(--c-danger); font-size: 14px; margin: 0; }
.form-error-global {
  background: #f9e3df; border: 1px solid var(--c-danger); color: #7a1e1a;
  padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px;
}
.form-notice {
  background: #e3efe7; border: 1px solid var(--c-accent); color: #143728;
  padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px;
}

.btn {
  display: inline-block; padding: 10px 18px; border-radius: var(--radius);
  border: 1px solid #c8c4b6; background: #fff; color: var(--c-fg);
  font: inherit; font-weight: 700; cursor: pointer; text-decoration: none;
}
.btn:hover { background: #f4f2eb; }
.btn-primary { background: var(--c-accent); border-color: var(--c-accent); color: #fff; }
.btn-primary:hover { background: #163e2f; color: #fff; }
.btn-warn { background: var(--c-warn); border-color: var(--c-warn); color: #fff; }
.btn-warn:hover { background: #a14f24; color: #fff; }
.btn-danger { background: var(--c-danger); border-color: var(--c-danger); color: #fff; }
.btn-danger:hover { background: #99332f; color: #fff; }

/* ページネーション */
.pagination { margin: 24px 0; display: flex; justify-content: center; align-items: center; gap: 16px; }

/* フッター */
.site-footer {
  background: #f0ede2;
  border-top: 1px solid var(--c-line);
  margin-top: 48px;
  padding: 24px 0 32px;
  color: var(--c-muted);
}
.site-footer .footer-tag { margin: 0 0 8px; }
.site-footer .footer-links {
  list-style: none; padding: 0; margin: 0 0 8px;
  display: flex; flex-wrap: wrap; gap: 16px;
}
.site-footer .footer-links a { color: var(--c-fg); }
.site-footer .footer-copy { font-size: 13px; }

.contact-list { padding-left: 1.4em; }
.mute { color: var(--c-muted); }
.contact-list li { margin-bottom: 6px; }

/* 画像付きカード (リッチ表示) */
.card-list-rich { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .card-list-rich { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .card-list-rich { grid-template-columns: repeat(3, 1fr); } }
.card-rich {
  display: flex; flex-direction: column;
  padding: 0; overflow: hidden;
  transition: transform .15s, box-shadow .15s;
}
.card-rich:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.08); }
.card-thumb {
  display: block; aspect-ratio: 16/9; background: #f4f2eb; overflow: hidden;
}
.card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-rich .card-body { padding: 14px 16px 16px; flex: 1; display: flex; flex-direction: column; }
.card-rich h2, .card-rich h3 { margin: 0 0 8px; font-size: 16px; line-height: 1.45; }
.card-rich .card-tags { margin-bottom: 14px; padding-bottom: 6px; border-bottom: 1px dotted var(--c-line); }
.card-rich .meta { margin-top: auto; padding-top: 8px; }

/* タグ */
.tag {
  display: inline-block; padding: 5px 14px; border-radius: 999px;
  background: var(--c-accent-soft); color: var(--c-accent);
  font-size: 13px; text-decoration: none; line-height: 1.4;
  border: 1px solid #cad8d0;
}
.tag:hover { background: var(--c-accent); color: #fff; }
.tag-active { background: var(--c-accent); color: #fff; }
.tag-sm { font-size: 11px; padding: 3px 10px; }
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px 8px; margin: 0; }

.post-image { max-width: 100%; height: auto; border-radius: var(--radius); }
.schools-header { background: var(--c-accent-soft); padding: 18px 20px; border-radius: var(--radius); margin-bottom: 20px; }
.schools-header h1 { margin: 0 0 6px; }

/* ─── 学校絞り込み (再設計) ───
   モバイル: ネイティブ <select> (大きく押しやすい)
   デスクトップ: 横並びチップ群 (アクティブ状態がはっきり)
*/
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.school-filter {
  margin: 0 0 28px;
  padding: 18px 20px 16px;
  background: linear-gradient(180deg, #fff 0%, #fafaf4 100%);
  border: 1px solid var(--c-line);
  border-left: 4px solid var(--c-accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.school-filter-heading {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-accent);
  letter-spacing: .03em;
  display: flex; align-items: center; gap: 8px;
}
.school-filter-heading::before {
  content: "🏫";
  font-size: 16px;
}

/* モバイル用 select ─ 480px未満で表示 */
.school-filter-select {
  display: flex; gap: 8px;
}
.school-filter-select select {
  flex: 1;
  font: inherit; font-size: 16px;
  padding: 12px 14px;
  background: #fff;
  border: 1.5px solid var(--c-accent);
  border-radius: var(--radius);
  color: var(--c-fg);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'><path fill='%231a4d3a' d='M3 5l4 4 4-4z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 38px;
}
.school-filter-select select:focus {
  outline: 2px solid var(--c-accent); outline-offset: 1px;
}

/* デスクトップ用 chip群 ─ 480px以上で表示 */
.school-filter-chips { display: none; }

@media (min-width: 480px) {
  .school-filter-select { display: none; }
  .school-filter-chips {
    display: flex; flex-wrap: wrap; gap: 6px;
  }
  .school-chip {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 7px 14px;
    background: #fff;
    color: var(--c-accent);
    font-size: 13px; font-weight: 600;
    text-decoration: none; line-height: 1.3;
    border: 1.5px solid #d4dcd6;
    border-radius: 999px;
    transition: all .12s ease;
  }
  .school-chip:hover {
    background: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
    transform: translateY(-1px);
  }
  .school-chip.is-active {
    background: var(--c-accent);
    border-color: var(--c-accent);
    color: #fff;
    box-shadow: 0 2px 6px rgba(26,77,58,.25);
  }
  .school-chip.is-active:hover {
    background: #163e2f;
    color: #fff;
  }
  .school-chip-mark {
    font-size: 11px;
    opacity: .6;
    font-weight: 700;
  }
  .school-chip.is-active .school-chip-mark {
    opacity: 1;
  }
}

/* 掲示板 */
.board-header { background: var(--c-accent-soft); padding: 20px; border-radius: var(--radius); margin-bottom: 24px; }
.board-header h1 { margin: 0 0 8px; }
.thread-list { list-style: none; padding: 0; margin: 0; }
.thread-item {
  background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 14px 16px; margin-bottom: 10px;
}
.thread-item h2 { margin: 0 0 4px; font-size: 17px; }
.thread-item h2 a { text-decoration: none; color: var(--c-fg); }
.thread-item h2 a:hover { color: var(--c-accent); text-decoration: underline; }
.thread-item .meta { margin: 0; font-size: 13px; color: var(--c-muted); }
.board-rules { margin-top: 32px; padding: 12px 16px; background: #fffbe6; border-left: 4px solid var(--c-warm); border-radius: 4px; font-size: 13px; color: var(--c-muted); }

.thread-body { margin-bottom: 24px; }
.thread-body p { margin: 0 0 1em; }
.replies { margin: 32px 0; }
.replies h2 { font-size: 18px; }
.reply-list { list-style: none; padding: 0; margin: 0; }
.reply-item {
  background: var(--c-card); border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 12px 16px; margin-bottom: 8px;
}
.reply-item .meta { margin: 0 0 8px; font-size: 13px; color: var(--c-muted); }
.reply-body p { margin: 0 0 0.8em; }
.reply-form-section { margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--c-line); }
.reply-form-section h2 { font-size: 17px; }