:root {
  --bg: #f6f8fc;
  --card: #fff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --border: #e5e7eb;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(180deg, #f7f9ff 0%, var(--bg) 100%);
  color: var(--text);
}
.container { max-width: 860px; margin: 28px auto; padding: 0 16px 24px; }
header h1 { margin: 0; }
header p { color: var(--muted); margin-top: 6px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.04);
  margin-top: 14px;
}
.grid { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
label { display: block; font-size: 14px; margin-bottom: 10px; color: #374151; }
input, textarea, select {
  width: 100%;
  margin-top: 6px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
}
textarea { resize: vertical; }
button {
  border: none;
  border-radius: 10px;
  background: var(--primary);
  color: white;
  padding: 11px 16px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { opacity: 0.95; }
#list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.item {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #fcfdff;
}
.item-top { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.item-title { font-size: 16px; }
.item-date { color: var(--muted); font-size: 13px; margin-top: 2px; }
.item-content { margin: 8px 0 0; white-space: pre-wrap; line-height: 1.5; }
.mood-tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
}
#empty { color: var(--muted); font-size: 14px; }
.mood-开心 { background: #fef3c7; color: #92400e; }
.mood-平静 { background: #dbeafe; color: #1e3a8a; }
.mood-难过 { background: #e0e7ff; color: #3730a3; }
.mood-焦虑 { background: #fee2e2; color: #991b1b; }
.mood-兴奋 { background: #dcfce7; color: #166534; }
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .container { margin-top: 16px; }
}