:root {
  /* 円形グラデーション（中央を明るく、外に向かって濃く） */
  --bg-gradient: radial-gradient(circle at center, #fdfcf7 0%, #e6d5b8 60%, #d2b48c 100%);
  --text-color: #3a2e2a;
  --card-bg: rgba(255, 253, 249, 0.9);
  --btn-gradient: linear-gradient(135deg, #d6bfa7, #b89c7d);
  --btn-gradient-hover: linear-gradient(135deg, #e0c7af, #c2a685);
}

body.dark {
  /* ダークモードも円形にして中心を少し明るく */
  --bg-gradient: radial-gradient(circle at center, #3a2e2a 0%, #2b211d 50%, #1a1411 100%);
  --text-color: #f3e9e2;
  --card-bg: rgba(59, 47, 41, 0.9);
  --btn-gradient: linear-gradient(135deg, #a1866b, #7b5e48);
  --btn-gradient-hover: linear-gradient(135deg, #b6987d, #8a6f57);
}

body {
  font-family: "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--bg-gradient);
  color: var(--text-color);
  transition: background 0.8s ease;
}

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

h1 {
  text-align: center;
  font-size: 1.8em;
  margin-bottom: 20px;
  color: var(--text-color);
}

#toggle-theme {
  display: block;
  margin: 0 auto 20px;
  background: var(--btn-gradient);
  color: white;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.9em;
  cursor: pointer;
  transition: all 0.3s ease;
}
#toggle-theme:hover {
  background: var(--btn-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.25);
}

.input-section {
  background: var(--card-bg);
  padding: 15px;
  border-radius: 12px;
  box-shadow: 0 3px 6px rgba(0,0,0,0.15);
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 5px;
}

input[type="date"], textarea, input[type="file"] {
  width: 100%;
  padding: 10px;
  font-size: 1em;
  margin-bottom: 10px;
  border: 1px solid #d1c4b2;
  border-radius: 8px;
  box-sizing: border-box;
  background: var(--card-bg);
  color: var(--text-color);
}

textarea {
  min-height: 100px;
  resize: vertical;
}

button {
  background: var(--btn-gradient);
  color: white;
  padding: 8px 14px;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

button:hover {
  background: var(--btn-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.25);
}

#previous-entries .entry {
  background: var(--card-bg);
  margin-bottom: 15px;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

#previous-entries h2 {
  font-size: 1.2em;
  margin: 0 0 10px;
}

#previous-entries p {
  margin: 0 0 10px;
  line-height: 1.5em;
}

#previous-entries img {
  max-width: 100%;
  border-radius: 8px;
  margin-top: 10px;
}

/* ボタン横並び */
.entry-buttons {
  display: flex;
  gap: 8px;
}

.edit-btn, .delete-btn {
  flex: 1;
  padding: 8px 12px;
  font-size: 0.85em;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  background: var(--btn-gradient);
  color: white;
  transition: all 0.3s ease;
}

.edit-btn:hover, .delete-btn:hover {
  background: var(--btn-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.25);
}