* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f4f6f9;
  color: #333;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.6rem;
  color: #2a7ae2;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 3px solid #2a7ae2;
}

h2 {
  font-size: 1.1rem;
  color: #444;
  margin-bottom: 12px;
}

/* フォーム */
.form-section {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

@media (max-width: 500px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

label {
  font-size: 0.85rem;
  color: #555;
  font-weight: 600;
}

input[type="text"],
input[type="number"],
input[type="date"] {
  padding: 9px 12px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

input:focus {
  border-color: #2a7ae2;
}

.btn-add {
  background: #2a7ae2;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 28px;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s;
}

.btn-add:hover {
  background: #1a5dbf;
}

/* サマリー */
.summary-section {
  margin-bottom: 16px;
}

.summary-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

@media (max-width: 600px) {
  .summary-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

.summary-card {
  background: #fff;
  border-radius: 10px;
  padding: 14px 12px;
  text-align: center;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  border-top: 3px solid #2a7ae2;
}

.summary-card.warn {
  border-top-color: #e67e22;
}

.summary-card.alert {
  border-top-color: #e74c3c;
}

.summary-label {
  font-size: 0.75rem;
  color: #777;
  margin-bottom: 4px;
}

.summary-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: #333;
}

/* フィルター */
.filter-section {
  background: #fff;
  border-radius: 10px;
  padding: 12px 20px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.filter-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: #555;
  cursor: pointer;
  font-weight: normal;
}

/* 一覧 */
.list-section {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.empty-msg {
  color: #999;
  text-align: center;
  padding: 30px 0;
  font-size: 0.95rem;
}

.room-card {
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 10px;
  position: relative;
  background: #fafafa;
  transition: box-shadow 0.2s;
}

.room-card:hover {
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.room-card.renewal-soon {
  border-left: 4px solid #e67e22;
  background: #fffbf5;
}

.room-card.renewal-expired {
  border-left: 4px solid #e74c3c;
  background: #fff5f5;
}

.room-card.unpaid {
  background: #fff0f0;
}

.room-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 6px;
}

.room-number {
  font-size: 1.1rem;
  font-weight: 700;
  color: #2a7ae2;
}

.room-tenant {
  font-size: 1rem;
  font-weight: 600;
  color: #333;
}

.room-details {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: #555;
}

.room-detail {
  display: flex;
  align-items: center;
  gap: 4px;
}

.detail-label {
  color: #888;
  font-size: 0.8rem;
}

.room-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 10px;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.badge-renewal {
  background: #fdebd0;
  color: #c0392b;
}

.badge-expired {
  background: #fadbd8;
  color: #c0392b;
}

.badge-unpaid {
  background: #fadbd8;
  color: #c0392b;
}

.badge-paid {
  background: #d5f5e3;
  color: #1e8449;
}

.btn-toggle-paid {
  padding: 4px 12px;
  border-radius: 6px;
  border: 1px solid #ccc;
  background: #f0f0f0;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-toggle-paid:hover {
  background: #e0e0e0;
}

.btn-delete {
  padding: 4px 12px;
  border-radius: 6px;
  border: none;
  background: #fdecea;
  color: #c0392b;
  font-size: 0.8rem;
  cursor: pointer;
  margin-left: auto;
  transition: background 0.2s;
}

.btn-delete:hover {
  background: #fadbd8;
}