:root {
  --bg: #faf6ef;
  --surface: #ffffff;
  --text: #2b2118;
  --muted: #6e5f50;
  --line: #e6dccd;
  --accent: #8a5a2b;
  --accent-text: #ffffff;
  --ok: #2f6b3a;
  --ok-bg: #e6f2e7;
  --few: #8a4b00;
  --few-bg: #fdf0dc;
  --full: #9b2c2c;
  --full-bg: #fbe5e5;
  --closed: #5f5f5f;
  --closed-bg: #ececec;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif;
  line-height: 1.7;
  font-size: 16px;
}

.site-header, main, .site-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header { padding-top: 24px; }
.site-header h1 { font-size: 1.4rem; margin: 0 0 8px; }
.lead { color: var(--muted); margin: 0 0 16px; font-size: 0.95rem; }

.filters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}
.filters label { display: flex; flex-direction: column; font-size: 0.85rem; color: var(--muted); }
.filters select {
  margin-top: 4px;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
}

.status { color: var(--muted); font-size: 0.9rem; min-height: 1.5em; }

.session-list { list-style: none; padding: 0; margin: 0 0 32px; display: grid; gap: 12px; }

.session {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}
.session-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-start; gap: 4px 8px; }
.session-date { font-size: 1.15rem; font-weight: 700; margin: 0; white-space: nowrap; }
.session-meta { color: var(--muted); margin: 4px 0 12px; font-size: 0.95rem; }

.badge {
  flex-shrink: 0;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge.available { color: var(--ok); background: var(--ok-bg); }
.badge.few       { color: var(--few); background: var(--few-bg); }
.badge.full      { color: var(--full); background: var(--full-bg); }
.badge.closed    { color: var(--closed); background: var(--closed-bg); }

.btn {
  display: block;
  width: 100%;
  padding: 12px;
  font-size: 1rem;
  font-weight: 700;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
}
.btn[disabled] { opacity: 0.55; }
.note { font-size: 0.85rem; color: var(--muted); margin: 8px 0 0; }
.waitlist { font-size: 0.9rem; color: var(--full); margin: 0; }

.site-footer { color: var(--muted); font-size: 0.85rem; padding-bottom: 32px; }

/* ===== ステップ4：予約フォーム ===== */
a.btn { text-align: center; text-decoration: none; }
a { color: var(--accent); }
.back { margin: 0 0 8px; font-size: 0.9rem; }

.form { display: grid; gap: 16px; margin-bottom: 40px; }
.form fieldset {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin: 0;
  min-width: 0;
}
.form legend { font-weight: 700; padding: 0 4px; }
.field { display: flex; flex-direction: column; gap: 4px; margin-top: 12px; font-size: 0.95rem; }
.field input, .field select, .field textarea {
  font: inherit;
  font-size: 16px; /* スマホで勝手に拡大されないように */
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  width: 100%;
}
em { font-style: normal; font-size: 0.75rem; color: var(--full); margin-left: 4px; }
.hint { font-size: 0.85rem; color: var(--muted); margin: 8px 0 0; }
.error { color: var(--full); font-size: 0.95rem; margin: 0; min-height: 0; }
.error:empty { display: none; }

.quote {
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: 12px;
  padding: 16px;
}
.quote h2 { font-size: 1rem; margin: 0 0 8px; }
.quote-lines { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.quote-lines td { padding: 4px 0; border-bottom: 1px dashed var(--line); }
.quote-lines td.num { text-align: right; white-space: nowrap; padding-left: 8px; }
.quote-total { display: flex; justify-content: space-between; align-items: baseline; margin: 12px 0 0; font-size: 1.1rem; }

.agree { display: flex; gap: 8px; align-items: flex-start; font-size: 0.95rem; }
.agree input { width: 22px; height: 22px; margin-top: 3px; flex-shrink: 0; }
.turnstile { min-height: 65px; }
.btn:not([disabled]) { cursor: pointer; }

.big-number { font-size: 1.8rem; font-weight: 700; letter-spacing: 0.05em; margin: 0 0 8px; }
.notice { background: var(--few-bg); color: var(--few); padding: 12px; border-radius: 8px; font-size: 0.9rem; }
.policy-text { white-space: pre-wrap; margin: 0; }
.radio { display: flex; gap: 8px; align-items: center; margin-top: 10px; font-size: 0.95rem; }
.radio input { width: 20px; height: 20px; flex-shrink: 0; }

/* ===== 管理画面 ===== */
body.admin { background: #f6f4f0; }
.admin-header, .admin-main { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.admin-header { padding-top: 16px; }
.admin-header h1 { font-size: 1.3rem; margin: 0; }
.tabs { display: flex; gap: 4px; margin-top: 12px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab { font: inherit; padding: 8px 14px; border: 1px solid transparent; border-bottom: none; background: none; color: var(--muted); cursor: pointer; border-radius: 8px 8px 0 0; white-space: nowrap; }
.tab[aria-selected="true"] { background: var(--surface); border-color: var(--line); color: var(--text); font-weight: 700; }
.admin-main { padding-top: 16px; padding-bottom: 48px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin-bottom: 12px; font-size: 0.9rem; }
.toolbar input, .toolbar select { font: inherit; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.btn.small { display: inline-block; width: auto; padding: 8px 14px; font-size: 0.9rem; }
.btn.tiny { display: inline-block; width: auto; padding: 4px 10px; font-size: 0.8rem; font-weight: 600; }
.btn.secondary { background: var(--surface); color: var(--accent); border: 1px solid var(--accent); }
.btn-group { display: flex; gap: 4px; flex-wrap: wrap; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 16px; }
.panel h2 { font-size: 1.05rem; margin: 0 0 8px; }
.panel-head { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.panel-head h2 { margin: 0; flex: 1 1 280px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0 12px; }
.actions { display: flex; gap: 8px; margin-top: 12px; }
.table-wrap { overflow-x: auto; margin-bottom: 16px; }
table.data { border-collapse: collapse; width: 100%; background: var(--surface); font-size: 0.85rem; }
table.data th, table.data td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
table.data th { background: #efe8dc; white-space: nowrap; }
.flash { background: var(--ok-bg); color: var(--ok); padding: 10px 12px; border-radius: 8px; }
.flash.error-flash { background: var(--full-bg); color: var(--full); }
.btn.danger { background: var(--full); color: #fff; }
.btn.tiny.danger { border: 1px solid var(--full); }
.dialog { border: none; border-radius: 12px; padding: 20px; width: min(720px, calc(100vw - 32px)); max-height: calc(100vh - 32px); overflow: auto; }
.dialog::backdrop { background: rgba(0, 0, 0, 0.35); }
.dialog h2 { font-size: 1.1rem; margin: 0 0 8px; padding-right: 64px; }
.dialog-close { position: sticky; top: 0; float: right; }
.dialog .btn-group { margin: 12px 0; }
.quote-box { margin-top: 8px; }
.subtabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 4px; margin: 4px 0 8px; }
.mail-preview { white-space: pre-wrap; background: #faf8f4; border: 1px solid var(--line); border-radius: 8px; padding: 12px; font-family: inherit; font-size: 0.9rem; }
.panel textarea, .panel input[type="text"], .panel input[type="email"], .panel input[type="number"], .panel input[type="date"], .panel input[type="time"], .panel select { font: inherit; padding: 8px; border: 1px solid var(--line); border-radius: 6px; width: 100%; background: var(--surface); }
table.data input, table.data select { min-width: 70px; }
.legal-links { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 0.85rem; margin: 8px 0 24px; }
.detail-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.detail-table th { text-align: left; white-space: nowrap; vertical-align: top; padding: 6px 12px 6px 0; color: var(--muted); font-weight: 600; }
.detail-table td { padding: 6px 0; white-space: pre-wrap; border-bottom: 1px dashed var(--line); }