:root {
  --bg: #f6f9fc;
  --panel: #ffffff;
  --text: #2c3e50;
  --muted: #6b7c93;
  --primary: #2980b9;
  --primary-dark: #1f6391;
  --accent: #00b894;
  --danger: #e74c3c;
  --border: #e6e9ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.header {
  background: linear-gradient(135deg, #74ebd5 0%, #ACB6E5 100%);
  color: #fff;
  padding: 28px 16px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
.header h1 { margin: 0 0 6px; }
.header p { margin: 0; opacity: 0.95; }
.month-switch {
  margin-top: 12px;
  color: #fff;
}
.month-switch label {
  margin-right: 6px;
  font-weight: 600;
}
.month-switch select {
  padding: 6px 10px;
  border-radius: 6px;
  border: none;
  font-size: 14px;
}

.container {
  max-width: 1100px;
  margin: 24px auto;
  padding: 0 16px;
}

.summary {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.card-label { font-size: 13px; color: var(--muted); }
.card-value { font-size: 20px; font-weight: 700; margin-top: 4px; }
.card.highlight .card-value { color: var(--accent); }

.goal {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin: 16px 0;
}
.goal label { font-weight: 600; display: block; margin-bottom: 6px; }
.goal input {
  width: 220px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.goal-row {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 10px;
}
.goal-row span { font-weight: 700; }

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 16px 0;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.panel-actions .btn { margin-left: 8px; }

.table-wrap { padding: 8px 14px 14px; }
table {
  width: 100%;
  border-collapse: collapse;
}
thead th {
  text-align: left;
  font-size: 13px;
  color: var(--muted);
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}
tbody td, tfoot td {
  padding: 8px;
  border-bottom: 1px solid var(--border);
}
tfoot td { background: #fafbfc; }
td.right { text-align: right; }

input[type="text"], input[type="number"] {
  width: 100%;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] { appearance: textfield; }

.btn {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.1s ease;
}
.btn:hover { background: var(--primary-dark); }
.btn:active { transform: scale(0.98); }
.btn.danger { background: var(--danger); }
.btn.danger:hover { filter: brightness(0.95); }

.bottom-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 16px 0 24px;
}
.chart-panel, .actions-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
}
.muted { color: var(--muted); font-size: 13px; }

[data-tooltip] {
  position: relative;
  cursor: help;
  z-index: 1;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: #333;
  color: #fff;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 13px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
}

[data-tooltip]::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: #333;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 999;
}

[data-tooltip]:hover::after,
[data-tooltip]:hover::before {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}


footer {
  background: #ecf0f1;
  text-align: center;
  padding: 15px;
  font-size: 14px;
  color: #666;
}
footer a {
  color: #2980b9;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  .summary { grid-template-columns: repeat(2, 1fr); }
  .bottom-row { grid-template-columns: 1fr; }
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  font-size: 14px;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 3px;
}