:root {
  color-scheme: light;
  --primary: #1e40af;
  --primary-dark: #1e3a8a;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --accent-bg: #fffbeb;
  --danger: #ef4444;
  --danger-dark: #dc2626;
  --danger-bg: #fef2f2;
  --success: #16a34a;
  --success-bg: #f0fdf4;
  --warning: #d97706;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --card-bg: #ffffff;

  --sidebar-bg: #0b1e4d;
  --sidebar-bg-hover: #14295e;
  --sidebar-text: #cbd5e1;
  --sidebar-text-active: #ffffff;

  --header-height: 60px;
  --sidebar-width: 232px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 16px rgba(15, 23, 42, 0.08);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #60a5fa;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --border: #334155;
  --bg: #0f172a;
  --card-bg: #1e293b;
  --primary-bg: #1e2a4a;
  --accent-bg: #3f2f0f;
  --danger-bg: #3f1d1d;
  --success-bg: #0f2e1d;
  --sidebar-bg: #060e26;
  --sidebar-bg-hover: #101f45;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  -webkit-tap-highlight-color: transparent;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--header-height) 1fr;
  grid-template-areas: "header header" "sidebar main";
  min-height: 100vh;
}

/* ---------- ヘッダー ---------- */
.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.app-header .header-left { display: flex; align-items: center; gap: 12px; min-width: 0; }
.app-header .brand {
  font-size: 1rem; font-weight: 700; color: var(--text); line-height: 1.3;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.app-header .header-right { display: flex; align-items: center; gap: 10px; }
.app-header .user-name { font-size: 0.82rem; color: var(--muted); white-space: nowrap; display: none; }
@media (min-width: 640px) { .app-header .user-name { display: inline; } }
.app-header form { margin: 0; }

.hamburger-btn {
  display: none; appearance: none; border: 1px solid var(--border); background: var(--card-bg);
  color: var(--text); border-radius: 8px; width: 38px; height: 38px; font-size: 1.1rem;
  cursor: pointer; align-items: center; justify-content: center; flex: none;
}
.icon-btn {
  border: 1px solid var(--border); background: var(--card-bg); color: var(--muted);
  border-radius: 8px; padding: 8px 12px; font-size: 0.8rem; cursor: pointer; white-space: nowrap;
}
.icon-btn:hover { background: var(--bg); }

/* ---------- サイドバー ---------- */
.app-sidebar {
  grid-area: sidebar; background: var(--sidebar-bg); padding: 16px 12px;
  overflow-y: auto; display: flex; flex-direction: column; gap: 2px;
}
.app-sidebar a {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-radius: 8px;
  text-decoration: none; color: var(--sidebar-text); font-size: 0.88rem; font-weight: 600; white-space: nowrap;
}
.app-sidebar a:hover { background: var(--sidebar-bg-hover); color: var(--sidebar-text-active); }
.app-sidebar a.active { background: var(--sidebar-bg-hover); color: var(--sidebar-text-active); box-shadow: inset 3px 0 0 var(--accent); }
.app-sidebar .nav-icon { font-size: 1.05rem; line-height: 1; flex: none; width: 1.2em; text-align: center; }
.app-sidebar .sidebar-divider { height: 1px; background: rgba(255, 255, 255, 0.1); margin: 10px 6px; }
.sidebar-backdrop { display: none; }

@media (max-width: 899px) {
  body { grid-template-columns: 1fr; grid-template-areas: "header" "main"; }
  .hamburger-btn { display: inline-flex; }
  .app-sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; width: min(var(--sidebar-width), 78vw);
    z-index: 101; transform: translateX(-100%); transition: transform 0.22s ease; box-shadow: var(--shadow-md);
  }
  .app-sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.open { display: block; position: fixed; inset: 0; background: rgba(15, 23, 42, 0.45); z-index: 100; }
}

main { grid-area: main; min-width: 0; }
.container { max-width: 880px; margin: 0 auto; padding: 24px 20px 56px; }
.container.wide { max-width: 1180px; }

.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px; margin-bottom: 20px; box-shadow: var(--shadow-sm);
}
.card h2 { margin: 0 0 14px; font-size: 1.05rem; }

.flash { border-radius: 8px; padding: 12px 14px; font-size: 0.85rem; margin-bottom: 16px; }
.flash.success { background: var(--success-bg); border: 1px solid #bbf7d0; color: var(--success); }
.flash.error { background: var(--danger-bg); border: 1px solid #fecaca; color: var(--danger); }

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 8px; border: 1px solid transparent;
  font-size: 0.88rem; font-weight: 600; cursor: pointer; text-decoration: none;
  background: var(--card-bg); color: var(--text); border-color: var(--border);
}
.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-dark); }
.btn-sm { padding: 6px 11px; font-size: 0.78rem; }

/* ---------- フォーム共通 ---------- */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 5px; font-weight: 600; }
.field input[type="text"], .field input[type="email"], .field input[type="password"],
.field input[type="date"], .field input[type="time"], .field input[type="number"],
.field input[type="tel"], .field select, .field textarea {
  width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.9rem; background: var(--card-bg); color: var(--text); font-family: inherit;
}
.field textarea { resize: vertical; min-height: 60px; }
.radio-group { display: flex; gap: 16px; align-items: center; }
.radio-group label { display: inline-flex; align-items: center; gap: 6px; font-size: 0.88rem; color: var(--text); font-weight: 400; }

/* ---------- バッジ ---------- */
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px; border-radius: 999px; font-size: 0.75rem; font-weight: 700; }
.badge-active { background: var(--success-bg); color: var(--success); }
.badge-inactive { background: var(--border); color: var(--muted); }
.badge-admin { background: var(--accent-bg); color: var(--accent-dark); }
.badge-confirmed { background: var(--primary-bg); color: var(--primary); }
.badge-cancelled { background: var(--danger-bg); color: var(--danger); }

/* ---------- ダッシュボード統計タイル ---------- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin-top: 16px; }
.stat-grid .stat { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px 10px; text-align: center; }
.stat-grid .stat .label { display: block; font-size: 0.72rem; color: var(--muted); margin-bottom: 4px; }
.stat-grid .stat .value { font-size: 1.3rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }

/* ---------- テーブル ---------- */
table.history { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
table.history thead th { position: sticky; top: 0; background: var(--card-bg); }
table.history th, table.history td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.history th { color: var(--muted); font-weight: 600; font-size: 0.75rem; }
table.history tbody tr:hover { background: var(--bg); }
.history-wrap { overflow-x: auto; }

/* ---------- 日別グリッド(ダッシュボード: 列=会議室、行=時間帯) ---------- */
.day-nav { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.day-nav .period-label { font-weight: 700; font-size: 1.05rem; }

.time-grid-wrap { display: flex; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--card-bg); overflow-x: auto; }
.time-grid-hours { flex: none; width: 52px; border-right: 1px solid var(--border); }
.time-grid-hours .hour-label {
  height: 48px; font-size: 0.7rem; color: var(--muted); text-align: right; padding-right: 6px;
  border-top: 1px solid var(--border); transform: translateY(-0.6em);
}
.time-grid-hours .hour-label:first-child { border-top: none; }
.time-grid-columns { flex: 1; display: flex; min-width: 0; }
.time-grid-col { flex: 1; min-width: 140px; position: relative; border-left: 1px solid var(--border); }
.time-grid-col:first-child { border-left: none; }
.time-grid-col-header { text-align: center; font-size: 0.8rem; font-weight: 700; padding: 8px 4px; border-bottom: 1px solid var(--border); background: var(--bg); }
.time-grid-col-header .cap { display: block; font-size: 0.68rem; color: var(--muted); font-weight: 400; }
.time-grid-col-body { position: relative; }
.time-grid-hour-row { height: 48px; border-top: 1px solid var(--border); }
.time-grid-hour-row:first-child { border-top: none; }
.time-grid-event {
  position: absolute; left: 3px; right: 3px; border-radius: 6px; padding: 3px 6px; font-size: 0.72rem;
  overflow: hidden; border: none; text-align: left; box-shadow: var(--shadow-sm); color: #fff; background: var(--primary);
}
.time-grid-event.blocked { background: var(--muted); opacity: 0.75; }
.time-grid-event .ev-time { display: block; font-size: 0.68rem; opacity: 0.85; }

/* ---------- 詳細モーダル ---------- */
.modal-overlay {
  display: none; position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5);
  align-items: center; justify-content: center; padding: 16px; z-index: 60;
}
.modal-overlay.open { display: flex; }
.modal-panel { background: var(--card-bg); color: var(--text); border-radius: 14px; padding: 22px; width: 100%; max-width: 440px; max-height: 90vh; overflow-y: auto; }
.modal-panel h3 { margin: 0 0 14px; font-size: 1.05rem; }
.modal-panel .actions { display: flex; gap: 10px; margin-top: 16px; }
.detail-row { font-size: 0.88rem; margin-bottom: 8px; }
.detail-row .k { color: var(--muted); font-size: 0.75rem; display: block; }

/* ---------- ページネーション ---------- */
.pagination { display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 16px; flex-wrap: wrap; }
.pagination a, .pagination span {
  display: inline-flex; align-items: center; justify-content: center; min-width: 34px; height: 34px;
  padding: 0 8px; border-radius: 8px; font-size: 0.85rem; text-decoration: none; color: var(--text); border: 1px solid var(--border);
}
.pagination a.current, .pagination span.current { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 700; }

@media (max-width: 420px) { .container { padding: 16px 12px 40px; } }

@media print {
  .app-header, .app-sidebar, .hamburger-btn, .sidebar-backdrop, .no-print { display: none !important; }
  body { display: block; background: #fff; }
  main { padding: 0; }
}