/* フォトナの森 — 白基調・モノクロ */
:root {
  --ink: #111111;
  --ink-soft: #404040;
  --muted: #6b6b6b;
  --line: #e5e5e5;
  --line-strong: #c8c8c8;
  --subtle: #f6f6f6;
  --panel: #fafafa;
  --danger: #b42318;
  --danger-bg: #fef3f2;
  --ok: #146c2e;
  --ok-bg: #f0f9f2;
  --radius: 8px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
h1, h2, h3, p, ol, ul, dl, dd, figure { margin: 0; }
ol, ul { padding: 0; list-style: none; }
a { color: var(--ink); }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
button, input, select, textarea { font: inherit; color: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---- 見出し・文字 ---- */
.h1 { font-size: 24px; font-weight: 700; line-height: 1.4; }
.h2 { font-size: 20px; font-weight: 700; }
.h3 { font-size: 18px; font-weight: 700; }
.muted-sm { font-size: 13px; color: var(--ink-soft); }
.muted-xs { font-size: 12px; color: var(--muted); }
.ok-xs { font-size: 12px; color: var(--ok); }
.danger-strong { color: var(--danger); font-weight: 600; font-size: 12px; }
.mono { font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; }
.small { font-size: 12px; }
.nowrap { white-space: nowrap; }
.pre { white-space: pre-wrap; overflow-wrap: anywhere; }
.clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---- 並べ方 ---- */
.stack-xl > * + * { margin-top: 40px; }
.stack-lg > * + * { margin-top: 32px; }
.stack-md > * + * { margin-top: 18px; }
.stack-sm > * + * { margin-top: 12px; }
.stack-xs > * + * { margin-top: 6px; }
.row-gap { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.push-right { margin-left: auto; }
.narrow { max-width: 600px; margin: 0 auto; }
.narrow-sm { max-width: 420px; margin: 0 auto; }

/* ---- ヘッダー・フッター ---- */
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.site-header__inner { max-width: 1200px; margin: 0 auto; padding: 10px 16px; display: flex; flex-wrap: wrap; gap: 4px 16px; align-items: center; justify-content: space-between; }
.site-logo { font-size: 20px; font-weight: 700; letter-spacing: 0.04em; text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
.site-header__right { display: flex; align-items: center; gap: 16px; }
.site-tagline { display: none; font-size: 13px; color: var(--ink-soft); }
.site-footer { border-top: 1px solid var(--line); }
.site-footer__inner { max-width: 1200px; margin: 0 auto; padding: 24px 16px 96px; font-size: 12px; color: var(--muted); line-height: 1.9; }
.footer-nav { display: flex; flex-wrap: wrap; margin: 0 -8px 8px; }
.footer-nav a { color: var(--muted); text-decoration: none; padding: 0 8px; min-height: 36px; display: inline-flex; align-items: center; }
.footer-nav a:hover { color: var(--ink); }

/* ---- ページ枠（1100px 以上で左右に広告枠） ---- */
.page { flex: 1; width: 100%; max-width: 1200px; margin: 0 auto; padding: 32px 16px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 32px; align-items: start; }
.main { min-width: 0; }
.ad-rail { display: none; position: sticky; top: 24px; }
.ad-box { width: 160px; height: 600px; border: 1px dashed var(--line-strong); border-radius: 6px; background: var(--panel); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; font-size: 12px; color: var(--muted); }
.ad-space { width: 160px; height: 600px; }

/* ---- ボタン ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px; border-radius: 6px; font-size: 14px; font-weight: 500; text-decoration: none; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--ink-soft); }
.btn-secondary { background: #fff; color: var(--ink); border-color: var(--line-strong); }
.btn-secondary:hover { background: var(--subtle); }
.btn-lg { min-height: 48px; padding: 0 32px; font-size: 15px; }
.btn-sm { min-height: 36px; padding: 0 16px; font-size: 12px; }
.btn-outline { display: inline-flex; align-items: center; gap: 6px; min-height: 40px; padding: 0 12px; border: 1px solid var(--ink); border-radius: 6px; font-size: 14px; font-weight: 500; text-decoration: none; background: #fff; }
.btn-outline:hover { background: var(--subtle); }
.btn-xs { display: inline-flex; align-items: center; min-height: 36px; padding: 0 12px; border-radius: 6px; font-size: 12px; font-weight: 500; cursor: pointer; border: 1px solid transparent; background: #fff; }
.btn-xs-danger { background: var(--danger); color: #fff; }
.btn-xs-outline { border-color: var(--line-strong); }
.select-sm { min-height: 36px; border: 1px solid var(--line-strong); border-radius: 6px; padding: 0 8px; font-size: 12px; background: #fff; }
.inline-form { display: inline-flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.fab { position: fixed; right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); z-index: 40; display: inline-flex; align-items: center; gap: 8px; min-height: 48px; padding: 0 20px; border-radius: 999px; background: var(--ink); color: #fff; font-size: 14px; font-weight: 500; text-decoration: none; box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25); }
.fab:hover { background: var(--ink-soft); }
.link-quiet { color: var(--muted); font-size: 12px; text-decoration: none; padding: 0 8px; min-height: 32px; display: inline-flex; align-items: center; }
.link-quiet:hover { color: var(--ink); text-decoration: underline; }
.back-link { font-size: 14px; color: var(--ink-soft); text-decoration: none; }

/* ---- フォーム ---- */
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 24px 16px; background: #fff; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.label { font-size: 14px; font-weight: 500; }
.label-sm { font-size: 12px; font-weight: 500; }
.badge-req { margin-left: 6px; font-size: 12px; font-weight: 400; color: var(--muted); }
.input { width: 100%; min-height: 44px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: 6px; background: #fff; font-size: 15px; outline: none; }
textarea.input { padding: 10px 12px; line-height: 1.75; resize: vertical; }
.input:focus { border-color: var(--ink); }
.input.is-error { border-color: var(--danger); }
.hint { font-size: 12px; color: var(--muted); }
.field-error { font-size: 14px; color: var(--danger); }
.counter { align-self: flex-end; font-size: 12px; color: var(--muted); }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1fr); gap: 20px; }
.post-form { display: flex; flex-direction: column; gap: 20px; margin-top: 20px; }
.fineprint { font-size: 12px; line-height: 1.9; color: var(--muted); }
.fineprint a { color: var(--muted); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.alert { border: 1px solid; border-radius: 6px; padding: 12px 16px; font-size: 14px; }
.alert-error { border-color: rgba(180, 35, 24, 0.3); background: var(--danger-bg); color: var(--danger); }
.alert-ok { border-color: rgba(20, 108, 46, 0.3); background: var(--ok-bg); color: var(--ok); }

/* ---- 掲示板 ---- */
.board > * + * { margin-top: 16px; }
.board__head { display: flex; flex-wrap: wrap; gap: 12px; align-items: baseline; justify-content: space-between; }
.filter { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; padding: 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.filter__buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.empty { border: 1px dashed var(--line-strong); border-radius: var(--radius); padding: 48px 24px; text-align: center; }
.empty__title { font-weight: 700; }
.empty__text { margin-top: 6px; font-size: 14px; color: var(--ink-soft); }
.posts > * + * { margin-top: 12px; }
.post { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; background: #fff; scroll-margin-top: 16px; }
.post > * + * { margin-top: 10px; }
.post__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.post__name { font-weight: 700; font-size: 15px; overflow-wrap: anywhere; }
.post__time { margin-left: auto; font-size: 12px; color: var(--muted); }
.chip { padding: 2px 8px; border-radius: 4px; background: var(--subtle); font-size: 12px; color: var(--ink-soft); }
.chip--outline { background: #fff; border: 1px solid var(--ink); color: var(--ink); font-weight: 500; }
.post__comment { font-size: 14px; line-height: 1.85; white-space: pre-wrap; overflow-wrap: anywhere; }
.contacts { display: flex; flex-wrap: wrap; gap: 6px 20px; padding-top: 10px; border-top: 1px solid #f0f0f0; font-size: 13px; }
.contacts > div { display: flex; gap: 8px; }
.contacts dt { color: var(--muted); }
.contacts dd { overflow-wrap: anywhere; }
.contacts__left { margin-left: auto; }
.contacts__left dd { color: var(--ink-soft); }
.contacts-expired { padding-top: 10px; border-top: 1px solid #f0f0f0; font-size: 12px; color: var(--muted); }
.replies { border-left: 2px solid var(--line); padding-left: 12px; }
.replies > * + * { margin-top: 8px; }
.reply__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 12px; }
.reply__name { font-weight: 700; overflow-wrap: anywhere; }
.reply__report { margin-left: auto; }
.reply__comment { font-size: 14px; line-height: 1.7; white-space: pre-wrap; overflow-wrap: anywhere; }
.post__actions { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.reply-box { flex: 1; min-width: 0; }
.reply-box > summary { list-style: none; }
.reply-box > summary::-webkit-details-marker { display: none; }
.reply-box[open] > summary { display: none; }
.reply-form { display: flex; flex-direction: column; gap: 12px; padding: 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); }
.reply-form .input { min-height: 40px; font-size: 14px; }
.pager { display: flex; justify-content: space-between; gap: 12px; }
.post-form-card { scroll-margin-top: 16px; }

/* ---- 通報・規約・エラー ---- */
.summary { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); padding: 12px 16px; }
.summary > * + * { margin-top: 6px; }
.summary__meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between; }
.summary__comment { font-size: 14px; line-height: 1.8; white-space: pre-wrap; overflow-wrap: anywhere; }
.legal { max-width: 680px; margin: 0 auto; font-size: 15px; line-height: 2; }
.legal > * + * { margin-top: 24px; }
.legal__head > * + * { margin-top: 4px; }
.legal-section > * + * { margin-top: 8px; }
.legal-section h2 { font-size: 18px; font-weight: 700; }
.legal-section p, .legal-section li { color: var(--ink-soft); }
.legal-section ul { padding-left: 20px; list-style: disc; }
.contact-box { border: 1px solid var(--line); background: var(--subtle); border-radius: 6px; padding: 12px 16px; font-family: ui-monospace, Menlo, Consolas, monospace; color: var(--ink) !important; overflow-wrap: anywhere; }
.center-box { max-width: 420px; margin: 0 auto; padding: 48px 0; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 16px; }

/* ---- 管理画面 ---- */
.admin-head { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-start; justify-content: space-between; }
.admin-list > * + * { margin-top: 12px; }
.admin-item { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; font-size: 14px; }
.admin-item > * + * { margin-top: 8px; }
.admin-item__meta { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 12px; color: var(--muted); }
.admin-quote { background: var(--subtle); border-radius: 4px; padding: 12px; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.table { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 14px; }
.table th { background: var(--subtle); text-align: left; font-size: 12px; font-weight: 500; color: var(--muted); padding: 8px 12px; }
.table td { border-top: 1px solid var(--line); padding: 8px 12px; vertical-align: top; }
.ban-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 16px; font-size: 14px; }

/* ---- 640px 以上 ---- */
@media (min-width: 640px) {
  .site-header__inner, .site-footer__inner { padding-left: 24px; padding-right: 24px; }
  .site-tagline { display: block; }
  .page { padding: 40px 24px; }
  .card { padding: 28px 24px; }
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto; align-items: end; }
  .filter__buttons { display: flex; }
  .post { padding: 16px 20px; }
  .replies { padding-left: 16px; }
  .fab { right: 24px; bottom: 24px; }
}

/* ---- 1100px 以上: 広告 | 本文 | 広告 ---- */
@media (min-width: 1100px) {
  .page { grid-template-columns: 160px minmax(0, 1fr) 160px; }
  .ad-rail { display: block; }
}