:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #dfe3e8;
  --text: #1f2530;
  --muted: #6b7280;
  --accent: #2f6f4f;
  --accent-dark: #1f4d36;
  --danger: #b3261e;
  --warn: #b3730b;
}

* { box-sizing: border-box; }

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

header {
  background: var(--accent-dark);
  color: white;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
header h1 { font-size: 18px; margin: 0; }
header label { display: flex; align-items: center; gap: 8px; font-size: 14px; }
header select { padding: 6px 8px; border-radius: 6px; border: none; }

nav#tabs {
  display: flex;
  gap: 4px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 16px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  color: var(--muted);
  border-bottom: 2px solid transparent;
}
.tab-btn.active { color: var(--accent-dark); border-bottom-color: var(--accent); font-weight: 600; }

main { padding: 24px; max-width: 1100px; margin: 0 auto; }
.tab-panel.hidden { display: none; }

h2 { font-size: 16px; margin-top: 28px; margin-bottom: 12px; color: var(--accent-dark); }
h2:first-child { margin-top: 0; }
h3, h4 { color: var(--accent-dark); }

.cards { display: flex; gap: 16px; flex-wrap: wrap; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  min-width: 200px;
}
.card .label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.card .value { font-size: 24px; font-weight: 700; margin-top: 4px; }
.card .value.negative { color: var(--danger); }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-top: 8px;
}
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: #f0f2f5; font-weight: 600; color: var(--muted); font-size: 12px; text-transform: uppercase; }
tr:last-child td { border-bottom: none; }
tr.clickable { cursor: pointer; }
tr.clickable:hover { background: #f7faf8; }

form {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: end;
  max-width: 700px;
}
form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
form label.checkbox { flex-direction: row; align-items: center; gap: 6px; }
form input, form select { padding: 8px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
button {
  padding: 9px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}
button:hover { background: var(--accent-dark); }
button.secondary { background: var(--muted); }
button.danger { background: var(--danger); }
button.small { padding: 5px 10px; font-size: 12px; margin-right: 6px; }

.hint { color: var(--muted); font-size: 13px; margin-top: 8px; }
.message { font-size: 14px; margin-top: 8px; }
.message.error { color: var(--danger); }
.message.success { color: var(--accent-dark); }

.detail-panel {
  margin-top: 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
}
.detail-panel.hidden { display: none; }
.status-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: #eef1f4;
  color: var(--muted);
}
.status-pill.paid, .status-pill.cleared { background: #e5f2ea; color: var(--accent-dark); }
.status-pill.overdue, .status-pill.failed { background: #fbe9e7; color: var(--danger); }
.status-pill.partially_paid, .status-pill.pending { background: #fdf1dc; color: var(--warn); }

@media print {
  header, nav#tabs, .tab-btn, form, button { display: none !important; }
  #statementResult button { display: none !important; }
  main { padding: 0; max-width: none; }
  #statementResult pre { border: none; white-space: pre-wrap; }
}