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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7fa;
  color: #333;
  min-height: 100vh;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 24px;
  color: #2c3e50;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: #555;
}

/* 入力セクション */
.input-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  margin-bottom: 20px;
}

.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.input-row label {
  width: 90px;
  font-size: 0.9rem;
  color: #666;
  flex-shrink: 0;
}

.input-row input {
  flex: 1;
  padding: 10px 12px;
  border: 1.5px solid #ddd;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
  outline: none;
}

.input-row input:focus {
  border-color: #4a90d9;
}

#addBtn {
  width: 100%;
  padding: 12px;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

#addBtn:hover {
  background: #357abd;
}

#addBtn:active {
  background: #2a6099;
}

/* グラフセクション */
.graph-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  margin-bottom: 20px;
}

#chart {
  width: 100%;
  height: 200px;
  display: block;
}

/* 一覧セクション */
.list-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.empty-msg {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 20px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

thead th {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 2px solid #eee;
  color: #888;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
}

tbody tr {
  border-bottom: 1px solid #f0f0f0;
}

tbody tr:last-child {
  border-bottom: none;
}

tbody td {
  padding: 12px 6px;
  vertical-align: middle;
}

tbody td:nth-child(2) {
  font-weight: 600;
  font-size: 1.05rem;
  color: #2c3e50;
}

.del-btn {
  background: none;
  border: 1.5px solid #e0e0e0;
  color: #aaa;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.del-btn:hover {
  border-color: #e74c3c;
  color: #e74c3c;
}

@media (max-width: 480px) {
  .input-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .input-row label {
    width: auto;
    margin-bottom: 4px;
  }

  .input-row input {
    width: 100%;
  }
}