:root {
  --income: #27ae60;
  --expense: #e74c3c;
  --balance-pos: #2980b9;
  --balance-neg: #e74c3c;
  --bg: #f0f2f5;
  --surface: #ffffff;
  --border: #dde1e7;
  --text: #2c3e50;
  --muted: #7f8c8d;
}

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

body {
  font-family: 'Hiragino Sans', 'Noto Sans JP', 'Yu Gothic', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

/* ヘッダー */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 { font-size: 1.25rem; font-weight: 700; letter-spacing: 0.05em; }

.month-picker { display: flex; align-items: center; gap: 0.5rem; }
.month-picker label { color: var(--muted); font-size: 0.85rem; }
.month-picker input {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
}

/* メイン */
main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* サマリーカード */
.summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  background: var(--surface);
  border-radius: 10px;
  padding: 1.1rem 1.4rem;
  box-shadow: 0 1px 3px rgba(0,0,0,.07);
  border-left: 4px solid var(--border);
}

.card-label { font-size: 0.78rem; color: var(--muted); margin-bottom: 0.35rem; letter-spacing: 0.04em; }
.card-amount { font-size: 1.55rem; font-weight: 700; letter-spacing: -0.01em; }

.income-card  { border-left-color: var(--income); }
.income-card  .card-amount { color: var(--income); }
.expense-card { border-left-color: var(--expense); }
.expense-card .card-amount { color: var(--expense); }
.balance-card { border-left-color: var(--balance-pos); }
.balance-card .card-amount { color: var(--balance-pos); }
.balance-card .card-amount.negative { color: var(--balance-neg); }

/* フォーム */
.add-form, .records, .category-summary {
  background: var(--surface);
  border-radius: 10px;
  padding: 1.4rem 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,.07);
}

h2 {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.form-row label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.78rem;
  color: var(--muted);
}

.form-row input,
.form-row select {
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.95rem;
  background: #fafbfc;
  transition: border-color 0.15s;
}

.form-row input:focus,
.form-row select:focus {
  outline: none;
  border-color: #2980b9;
  background: #fff;
}

.form-row input[name="amount"] { width: 110px; }
.form-row input[name="note"]   { width: 160px; }

button[type="submit"] {
  padding: 0.48rem 1.3rem;
  background: #2980b9;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.15s;
  align-self: flex-end;
}

button[type="submit"]:hover { background: #1f6391; }

/* カテゴリ別集計 */
#cat-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

#cat-list li {
  background: #fef9f0;
  border: 1px solid #f5e5c8;
  border-radius: 6px;
  padding: 0.3rem 0.8rem;
  font-size: 0.88rem;
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

#cat-list li .cat-name   { color: var(--muted); }
#cat-list li .cat-amount { font-weight: 700; color: var(--expense); }

/* 記録一覧 */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th {
  text-align: left;
  padding: 0.45rem 0.75rem;
  border-bottom: 2px solid var(--border);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8f9fa; }

td.amount { font-weight: 700; }
td.income  { color: var(--income); }
td.expense { color: var(--expense); }
td.note    { color: var(--muted); font-size: 0.85rem; }

.btn-delete {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  color: var(--muted);
  padding: 0.2rem 0.55rem;
  font-size: 0.8rem;
  transition: all 0.15s;
}

.btn-delete:hover {
  background: #fdecea;
  color: var(--expense);
  border-color: var(--expense);
}

.empty-msg {
  color: var(--muted);
  text-align: center;
  padding: 2.5rem;
  font-size: 0.9rem;
}

@media (max-width: 620px) {
  header { flex-direction: column; gap: 0.7rem; align-items: flex-start; }
  .summary { grid-template-columns: 1fr; }
  .form-row { flex-direction: column; }
  .form-row label { width: 100%; }
  .form-row input[name="amount"],
  .form-row input[name="note"] { width: 100%; }
}