:root {
  --excel-border: #d4d4d4;
  --excel-header-bg: #f8f9fa;
  --excel-header-text: #5f6368;
  --excel-selection-bg: #e8f0fe;
  --excel-selection-border: #1a73e8;
  --primary-color: #1a73e8;
  --text-color: #3c4043;
  --bg-color: #ffffff;
  --income-color: #0d652d;
  --expense-color: #c5221f;
}

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

body {
  font-family: 'Pretendard', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.4;
  font-size: 13px; /* Smaller font for excel feel */
}

.container-full {
  width: 100%;
  padding: 0 16px;
}

/* Minimalist Header */
.minimal-header {
  padding: 12px 0;
  border-bottom: 1px solid var(--excel-border);
  background: white;
}

.brand-box {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-name {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 1px;
}

.brand-divider {
  color: var(--excel-border);
  font-weight: 300;
}

.brand-title {
  color: var(--excel-header-text);
  font-weight: 500;
}

/* Month Selector UI */
.month-selector-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
}

.month-input {
  border: 1px solid var(--excel-border);
  padding: 4px 8px;
  border-radius: 4px;
  font-family: inherit;
  font-size: 13px;
  outline-color: var(--primary-color);
}

/* Ledger Sheet Table */
.sheet-container {
  overflow: auto;
  border: 1px solid var(--excel-border);
  border-bottom: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  background: white;
}

th {
  background: var(--excel-header-bg);
  color: var(--excel-header-text);
  padding: 6px 12px;
  font-weight: 500;
  text-align: left;
  border: 1px solid var(--excel-border);
  font-size: 12px;
}

td {
  border: 1px solid var(--excel-border);
  padding: 0;
}

tr:hover td {
  background-color: #f1f3f4;
}

.cell-input {
  width: 100%;
  height: 32px;
  border: 2px solid transparent;
  background: transparent;
  padding: 0 10px;
  font-family: inherit;
  font-size: 13px;
  color: inherit;
  outline: none;
  display: block;
}

.cell-input:focus {
  background: white;
  border-color: var(--excel-selection-border);
  z-index: 2;
  position: relative;
}

.number-input {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.balance-cell {
  text-align: right;
  padding: 0 10px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-weight: 500;
  background-color: #fafafa;
}

.income-text { color: var(--income-color); }
.expense-text { color: var(--expense-color); }

/* Footer Summary */
.summary-row td {
  background: var(--excel-header-bg);
  font-weight: 700;
}

.final-balance-total {
  background: #e6f4ea !important;
  color: var(--income-color);
}

/* Controls */
.controls {
  padding: 16px 0;
  display: flex;
  gap: 8px;
}

.btn {
  padding: 6px 12px;
  border: 1px solid var(--excel-border);
  background: white;
  color: var(--text-color);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 4px;
}

.btn:hover {
  background: #f8f9fa;
  border-color: #c6c6c6;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.btn-primary:hover {
  background: #1967d2;
}

.btn-secondary {
  background-color: #f8f9fa;
  color: var(--text-color);
}

.btn-secondary:hover {
  background-color: #f1f3f4;
}

.btn-success {
  background-color: #e6f4ea !important;
  color: #0d652d !important;
  border-color: #ceead6 !important;
}

.minimal-footer {
  padding: 24px 0;
  color: #9aa0a6;
  font-size: 12px;
  text-align: center;
}