:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-light: #e0e7ff;
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #d97706;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
  font-size: 14px;
  background: var(--gray-50);
  color: var(--gray-900);
  overflow-x: hidden;
}

/* ── ナビゲーション ── */
nav {
  background: var(--primary);
  color: #fff;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 4px;
  height: 52px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 4px rgba(0,0,0,.2);
}
nav .brand {
  font-size: 16px;
  font-weight: 700;
  margin-right: 16px;
  white-space: nowrap;
  text-decoration: none;
  color: #fff;
}
nav a {
  color: rgba(255,255,255,.85);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 13px;
  white-space: nowrap;
  transition: background .15s;
}
nav a:hover, nav a.active { background: rgba(255,255,255,.18); color: #fff; }

/* ── スマホ・タブレット対応：ナビを折り返し表示 ── */
@media (max-width: 768px) {
  nav {
    flex-wrap: wrap;
    height: auto;
    padding: 8px 12px;
    gap: 4px 6px;
  }
  nav .brand {
    flex-basis: 100%;
    margin-right: 0;
    margin-bottom: 4px;
    font-size: 15px;
  }
  nav a {
    font-size: 12px;
    padding: 5px 10px;
  }
  main { padding: 16px 12px; }
}

/* ── メインコンテンツ ── */
main { max-width: 1200px; margin: 0 auto; padding: 24px 16px; }
h1 { font-size: 22px; font-weight: 700; margin-bottom: 20px; color: var(--gray-900); }
h2 { font-size: 17px; font-weight: 600; margin-bottom: 12px; }

/* ── カード ── */
.card {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  margin-bottom: 20px;
}

/* ── 統計カード ── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  text-align: center;
}
.stat-card .value { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 12px; color: var(--gray-500); margin-top: 4px; }
.stat-card.alert .value { color: var(--danger); }

/* ── テーブル ── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  background: var(--gray-100);
  padding: 10px 12px;
  text-align: center;
  font-weight: 600;
  font-size: 12px;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}
tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}
tbody tr:hover { background: var(--gray-50); }
tbody tr:last-child td { border-bottom: none; }

/* ── ボタン ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 7px;
  border: none;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  transition: filter .15s, opacity .15s;
  text-decoration: none;
}
.btn:hover { filter: brightness(.93); }
.btn:active { filter: brightness(.86); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: var(--gray-200); color: var(--gray-700); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: #fef3c7; color: var(--warning); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-icon { padding: 6px; border-radius: 6px; }

/* ── フォーム ── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; font-weight: 600; color: var(--gray-700); margin-bottom: 5px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 7px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--gray-900);
  transition: border-color .15s, box-shadow .15s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.15);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

/* ── モーダル ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  overflow-y: auto;
}
.modal-overlay.hidden { display: none; }
.modal {
  background: #fff;
  border-radius: 12px;
  width: 100%;
  max-width: 600px;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--gray-200);
}
.modal-header h2 { margin: 0; font-size: 17px; }
.modal-close { background: none; border: none; cursor: pointer; font-size: 22px; color: var(--gray-500); padding: 0 4px; }
.modal-body { padding: 24px; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 16px 24px;
  border-top: 1px solid var(--gray-200);
}

/* ── バッジ・ステータス ── */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 600;
}
.badge-green { background: #dcfce7; color: #15803d; }
.badge-red { background: #fee2e2; color: #b91c1c; }
.badge-gray { background: var(--gray-200); color: var(--gray-500); }
.badge-yellow { background: #fef3c7; color: #92400e; }
.badge-blue { background: #dbeafe; color: #1d4ed8; }

/* ── ツールバー ── */
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.toolbar input[type="text"], .toolbar select {
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 7px;
  font-size: 13px;
  font-family: inherit;
}
.toolbar input[type="text"]:focus, .toolbar select:focus {
  outline: none;
  border-color: var(--primary);
}
.spacer { flex: 1; }

/* ── タブ ── */
.tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 2px solid var(--gray-200); }
.tab-btn {
  padding: 10px 18px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  color: var(--gray-500);
  font-weight: 500;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color .15s;
}
.tab-btn:hover { color: var(--primary); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── 月ナビゲーター ── */
.month-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 17px;
  font-weight: 700;
}
.month-nav button {
  background: none;
  border: 1px solid var(--gray-300);
  border-radius: 7px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.month-nav button:hover { background: var(--gray-100); }

/* ── チェックボックス・ピル ── */
.pill-group { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  padding: 6px 14px;
  border-radius: 9999px;
  border: 1.5px solid var(--gray-300);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all .15s;
  background: #fff;
}
.pill.selected { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ── チェック列ボタン（出品） ── */
.toggle-btn {
  padding: 3px 10px;
  border-radius: 5px;
  border: 1px solid var(--gray-300);
  background: #fff;
  cursor: pointer;
  font-size: 12px;
  font-family: inherit;
  transition: all .15s;
}
.toggle-btn.on { background: var(--primary-light); border-color: var(--primary); color: var(--primary); font-weight: 700; }
.toggle-btn.promote { background: #fef3c7; border-color: var(--warning); color: var(--warning); }

/* ── ローディング ── */
.loading { text-align: center; padding: 40px; color: var(--gray-500); }
.spinner {
  display: inline-block;
  width: 24px; height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin-right: 8px;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── アラート ── */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 13px;
}
.alert-error { background: #fee2e2; color: #991b1b; }
.alert-info { background: #dbeafe; color: #1e40af; }

/* ── 生徒詳細 ── */
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 24px; }
.detail-item label { font-size: 11px; color: var(--gray-500); font-weight: 600; }
.detail-item p { margin-top: 2px; }

/* ── クイックリンク ── */
.quick-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; }
.quick-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  text-decoration: none;
  color: var(--gray-700);
  font-size: 13px;
  font-weight: 500;
  transition: box-shadow .15s, transform .15s;
}
.quick-link:hover { box-shadow: 0 4px 12px rgba(79,70,229,.15); transform: translateY(-2px); }
.quick-link .icon { font-size: 28px; }

/* ── セクション見出し ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.section-header h2 { margin: 0; }

/* ── rank選択モーダル ── */
.rank-select { width: 100%; padding: 8px; border: 1px solid var(--gray-300); border-radius: 6px; font-family: inherit; font-size: 14px; }

/* ── empty state ── */
.empty { text-align: center; padding: 48px; color: var(--gray-500); }
.empty p { margin-top: 8px; font-size: 13px; }

/* ── スクロール付きテーブル（ヘッダー固定） ── */
.table-scrollable { overflow-y: auto; max-height: 70vh; }
.table-scrollable thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--gray-100);
  box-shadow: 0 1px 0 var(--gray-200);
}

/* ── 学校名未設定ハイライト ── */
tr.highlight-warning td { background: #fffbeb !important; }
tr.highlight-warning td:first-child { border-left: 3px solid var(--warning); }

/* ── シャッター（折りたたみ） ── */
.shutter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
  padding: 10px 0 8px;
  border-bottom: 1px solid var(--gray-200);
  margin-bottom: 0;
}
.shutter-header:hover { opacity: .85; }
.shutter-header h3 { margin: 0; font-size: 13px; color: var(--gray-700); font-weight: 600; }
.shutter-meta { font-size: 12px; color: var(--gray-500); display: flex; align-items: center; gap: 8px; }
.shutter-arrow {
  display: inline-block;
  transition: transform .2s;
  font-size: 11px;
  color: var(--gray-500);
}
.shutter-arrow.open { transform: rotate(180deg); }
.shutter-body {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height .25s ease, opacity .2s ease;
}
.shutter-body.open { max-height: 4000px; opacity: 1; }
.classroom-shutter { margin-bottom: 12px; }