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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f1f5f9;
  color: #1e293b;
  min-height: 100vh;
  padding: 16px;
}

.container {
  max-width: 640px;
  margin: 0 auto;
}

h1 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: #1e293b;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: #475569;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: flex-end;
}

input[type="text"],
input[type="number"] {
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color .2s;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: #3b82f6;
}

#nameInput { flex: 1 1 120px; }
#groupInput { flex: 1 1 120px; }

input[type="number"] {
  width: 70px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: #64748b;
}

button {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background .15s;
}

button:hover { opacity: .85; }

#addBtn {
  background: #3b82f6;
  color: #fff;
  white-space: nowrap;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.primary {
  flex: 1;
  background: #3b82f6;
  color: #fff;
  font-size: 1rem;
  padding: 10px;
}

.danger {
  background: #fee2e2;
  color: #dc2626;
  padding: 10px 18px;
}

/* 参加者リスト */
.list {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.participant-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.9rem;
}

.participant-item .info {
  display: flex;
  gap: 8px;
  align-items: center;
}

.participant-item .group-tag {
  background: #dbeafe;
  color: #2563eb;
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.78rem;
  font-weight: 600;
}

.del-btn {
  background: none;
  color: #94a3b8;
  font-size: 1.1rem;
  padding: 2px 6px;
  line-height: 1;
}

.del-btn:hover { color: #dc2626; }

/* 結果 */
.hidden { display: none; }

.table-block {
  margin-bottom: 14px;
}

.table-block h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 6px;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 4px;
}

.table-block .seat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.seat-chip {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 0.88rem;
  color: #1e40af;
}

.seat-chip .g {
  font-size: 0.75rem;
  color: #64748b;
  margin-left: 4px;
}

.no-assign {
  color: #94a3b8;
  font-size: 0.85rem;
  padding: 4px 0;
}

.overflow-note {
  color: #dc2626;
  font-size: 0.82rem;
  margin-top: 8px;
}

@media (max-width: 480px) {
  h1 { font-size: 1.2rem; }
  .form-row { gap: 6px; }
}