:root {
  --bg: #0e0f13;
  --bg-elev: #151822;
  --text: #e7e7ea;
  --muted: #a9afbd;
  --accent: #6c8cff;
  --accent-2: #22c55e;
  --danger: red;
  --border: #232838;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: linear-gradient(180deg, #0b0c10 0%, #0f121a 100%);
}

.app {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--bg-elev);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
}

.sidebar h1 {
  font-size: 18px;
  line-height: 1.2;
  margin: 0 0 16px 0;
}

.menu {
  display: grid;
  gap: 8px;
  margin-bottom: 24px;
}

.menu-item {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
}

.menu-item:hover {
  border-color: var(--accent);
}

.menu-item.active {
  background: #1a1f2e;
  border-color: var(--accent);
}

.io-actions {
  display: grid;
  gap: 8px;
}

.import-label {
  display: block;
}

.import-label span,
#csvExport,
#clearAll {
  display: inline-block;
  width: 100%;
  background: #1b2131;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
}

#csvExport:hover { border-color: var(--accent-2); }

#clearAll {
  background: #2a1820;
  border-color: #3b1e28;
}

#clearAll:hover {
  border-color: var(--danger);
}

.content {
  padding: 24px;
}

.section { display: none; }
.section.visible { display: block; }

h2 { margin-top: 0; }

.form-row {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}

.form-row input,
.form-row select {
  background: #131722;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
}

.form-actions { margin-top: 12px; }

.form-actions button {
  background: var(--accent);
  color: #0b0c10;
  font-weight: 600;
  border: none;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
}

.message { margin-top: 8px; color: var(--accent-2); }
.empty { color: var(--muted); }

.table-wrap {
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #0f1320;
}

#expensesTable { width: 100%; border-collapse: collapse; }

#expensesTable th,
#expensesTable td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

#expensesTable thead th {
  position: sticky;
  top: 0;
  background: #14192a;
  z-index: 1;
}

.action-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 8px;
  border-radius: 6px;
  cursor: pointer;
}

.action-btn:hover { border-color: var(--accent); }

.chart-wrap {
  background: #0f1320;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.danger { color: var(--danger); }

@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
}