* {
  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: 800px;
  margin: 0 auto;
  padding: 16px;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #2563eb;
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid #2563eb;
}

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

section {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

/* フォーム */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}

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

.form-group label {
  font-size: 0.82rem;
  color: #666;
  font-weight: 500;
}

.form-group input {
  border: 1px solid #d1d5db;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}

.form-group input:focus {
  border-color: #2563eb;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #1d4ed8;
}

/* グラフ */
.chart-legend {
  display: flex;
  gap: 16px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.legend-item {
  font-size: 0.82rem;
  font-weight: 500;
}

.systolic-color { color: #ef4444; }
.diastolic-color { color: #3b82f6; }
.pulse-color { color: #10b981; }

.canvas-wrapper {
  width: 100%;
  overflow-x: auto;
}

#chart {
  display: block;
  width: 100%;
  height: 220px;
}

.no-data {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 20px 0;
}

/* 一覧 */
.record-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.record-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px 14px;
  gap: 8px;
}

.record-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.record-date {
  font-size: 0.82rem;
  color: #888;
}

.record-values {
  font-size: 0.95rem;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.val-s { color: #ef4444; font-weight: 600; }
.val-d { color: #3b82f6; font-weight: 600; }
.val-p { color: #10b981; font-weight: 600; }

.delete-btn {
  background: none;
  border: 1px solid #fca5a5;
  color: #ef4444;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.82rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}

.delete-btn:hover {
  background: #fee2e2;
}

.empty-msg {
  text-align: center;
  color: #aaa;
  font-size: 0.9rem;
  padding: 16px 0;
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }

  h1 { font-size: 1.3rem; }

  .record-values {
    font-size: 0.88rem;
  }
}

@media (max-width: 375px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}