:root {
  --ink: #1c1f24;
  --ink-soft: #5b6472;
  --line: #dfe3e9;
  --line-soft: #eef1f5;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --accent: #1d5fb5;
  --accent-dark: #17488a;
  --ok: #17724b;
  --ok-bg: #e7f5ee;
  --warn: #8a5a06;
  --warn-bg: #fdf3e0;
  --bad: #a52020;
  --bad-bg: #fdeceb;
  --radius: 6px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.7 "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}

.wrap { max-width: 940px; margin: 0 auto; padding: 0 16px; }
.wrap--wide { max-width: 1240px; }

/* --- header / footer ---------------------------------------------------- */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 56px; gap: 16px; }
.site-title { font-weight: 700; font-size: 17px; color: var(--ink); text-decoration: none; }
.site-footer { margin-top: 48px; padding: 20px 0 40px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 13px; }

.admin-header { background: #23272e; border-bottom: none; }
.admin-header .site-title { color: #fff; }
.admin-nav { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.admin-nav a { color: #c8d0dc; text-decoration: none; }
.admin-nav a:hover, .admin-nav a[aria-current="page"] { color: #fff; text-decoration: underline; }

main { padding-top: 24px; }

/* --- typography --------------------------------------------------------- */
h1 { font-size: 22px; margin: 0 0 16px; line-height: 1.4; }
h2 { font-size: 18px; margin: 32px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--line); }
h3 { font-size: 16px; margin: 20px 0 8px; }
p { margin: 0 0 12px; }
.lead { color: var(--ink-soft); }
.muted { color: var(--ink-soft); font-size: 13px; }
code { font-family: Consolas, "Courier New", monospace; font-size: 13px; }
a { color: var(--accent); }

/* --- panels ------------------------------------------------------------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 16px;
}

.company-block { margin-bottom: 28px; }
.company-block > h2 { margin-top: 0; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.card h3 { margin: 0; font-size: 15px; }
.card h3 a { text-decoration: none; }
.card h3 a:hover { text-decoration: underline; }
.card .card-meta { font-size: 13px; color: var(--ink-soft); margin: 0; }
.card .card-foot { margin-top: auto; }

/* --- session slots ------------------------------------------------------ */
.day-group { margin-bottom: 24px; }
.day-group > h3 {
  background: var(--line-soft);
  border-radius: var(--radius);
  padding: 6px 12px;
  font-size: 14px;
}
.slot-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; list-style: none; padding: 0; margin: 0; }
.slot {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.slot--full { background: #fbfbfc; }
.slot--closed { background: #f2f3f5; color: var(--ink-soft); }
.slot-time { font-weight: 700; font-size: 15px; }
.slot-seats { font-size: 13px; }

.badge {
  display: inline-block;
  font-size: 12px;
  line-height: 1.5;
  padding: 1px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge--ok { background: var(--ok-bg); color: var(--ok); }
.badge--warn { background: var(--warn-bg); color: var(--warn); }
.badge--bad { background: var(--bad-bg); color: var(--bad); }
.badge--muted { background: var(--line-soft); color: var(--ink-soft); }

/* --- forms -------------------------------------------------------------- */
.field { margin-bottom: 16px; }
.field > label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.field .hint { font-size: 12px; color: var(--ink-soft); margin: 2px 0 0; }
.field .error { font-size: 13px; color: var(--bad); margin: 4px 0 0; }

input[type=text], input[type=email], input[type=password], input[type=number],
input[type=date], input[type=time], input[type=datetime-local], select, textarea {
  width: 100%;
  max-width: 460px;
  padding: 7px 10px;
  border: 1px solid #b9c0cb;
  border-radius: var(--radius);
  font: inherit;
  background: #fff;
  color: var(--ink);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: var(--accent); }
input[aria-invalid=true] { border-color: var(--bad); }
textarea { min-height: 110px; resize: vertical; }
input[type=number] { max-width: 140px; }

.form-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 20px; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.filter-bar .field { margin-bottom: 0; }
.filter-bar input, .filter-bar select { max-width: 190px; }

.btn {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:disabled, .btn[aria-disabled=true] { background: #9aa5b4; border-color: #9aa5b4; cursor: not-allowed; }
.btn--ghost { background: #fff; color: var(--accent); }
.btn--ghost:hover { background: #eef4fc; }
.btn--danger { background: var(--bad); border-color: var(--bad); }
.btn--danger:hover { background: #8a1a1a; border-color: #8a1a1a; }
.btn--small { padding: 4px 12px; font-size: 13px; font-weight: 500; }

/* --- tables ------------------------------------------------------------- */
.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
}
.table th, .table td { padding: 8px 12px; border-bottom: 1px solid var(--line-soft); text-align: left; vertical-align: top; }
.table thead th { background: #f0f2f5; font-size: 13px; white-space: nowrap; }
.table tbody tr:last-child th, .table tbody tr:last-child td { border-bottom: none; }
.table--diag th[scope=row] { width: 240px; font-weight: 600; }
.table .is-bad td, .table .is-bad th { background: var(--bad-bg); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; }

.detail-list { margin: 0; }
.detail-list dt { font-size: 13px; color: var(--ink-soft); margin-top: 10px; }
.detail-list dd { margin: 0; font-weight: 600; }

/* --- flash -------------------------------------------------------------- */
.flash-stack { margin-bottom: 16px; }
.flash {
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  margin-bottom: 8px;
  font-size: 14px;
}
.flash--success { background: var(--ok-bg); border-color: #b7ddc9; color: var(--ok); }
.flash--error { background: var(--bad-bg); border-color: #f0bdbb; color: var(--bad); }
.flash--info { background: #e9f0fa; border-color: #c2d5ef; color: var(--accent-dark); }

.error-summary { background: var(--bad-bg); border: 1px solid #f0bdbb; border-radius: var(--radius); padding: 12px 16px; margin-bottom: 16px; }
.error-summary h2 { margin: 0 0 6px; font-size: 15px; border: none; padding: 0; color: var(--bad); }
.error-summary ul { margin: 0; padding-left: 20px; font-size: 14px; }

/* --- misc --------------------------------------------------------------- */
.breadcrumb { font-size: 13px; color: var(--ink-soft); margin-bottom: 12px; }
.breadcrumb a { color: var(--ink-soft); }

.pagination { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 16px; align-items: center; font-size: 14px; }
.pagination a, .pagination span { padding: 4px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; text-decoration: none; }
.pagination .is-current { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat dt { font-size: 13px; color: var(--ink-soft); margin: 0; }
.stat dd { margin: 4px 0 0; font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }

.inline-form { display: inline; }
.empty { color: var(--ink-soft); padding: 24px; text-align: center; background: var(--panel); border: 1px dashed var(--line); border-radius: var(--radius); }