:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --ink: #1f2937;
  --muted: #667085;
  --line: #d9e2ec;
  --blue: #1f4e79;
  --teal: #147d83;
  --red: #c2413d;
  --amber: #b7791f;
  --green: #2f855a;
}

* { box-sizing: border-box; }

html {
  max-width: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, "Noto Sans KR", sans-serif;
  max-width: 100%;
  overflow-x: hidden;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 252px 1fr;
}

.sidebar {
  background: #172536;
  color: #fff;
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  background: #e6f0f5;
  color: var(--blue);
  font-weight: 800;
}

h1, h2, h3, p { margin: 0; }

.brand h1 { font-size: 18px; letter-spacing: 0; }
.brand p { font-size: 12px; color: #b8c7d9; margin-top: 3px; }

.nav {
  display: grid;
  gap: 6px;
}

.nav-item {
  height: 38px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: #cbd8e7;
  text-align: left;
  padding: 0 12px;
  font: inherit;
  cursor: pointer;
}

.nav-item.active {
  background: #29425d;
  color: #fff;
}

.hidden-nav {
  display: none !important;
}

.source-note {
  margin-top: auto;
  color: #b8c7d9;
  font-size: 12px;
  line-height: 1.45;
}

.content {
  padding: 22px;
  min-width: 0;
  overflow-x: hidden;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 18px;
}

.eyebrow {
  display: block;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.toolbar h2 { font-size: 26px; letter-spacing: 0; }

.controls {
  display: flex;
  gap: 10px;
}

label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 12px;
}

select, input {
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 0 10px;
  color: var(--ink);
}

input[type="checkbox"] {
  height: auto;
  padding: 0;
}

.solar-controls {
  display: flex;
  align-items: end;
  gap: 12px;
  padding: 0 0 12px;
  flex-wrap: wrap;
}

.solar-controls input[type="number"] {
  width: 92px;
}

.zero-export-ui {
  display: none !important;
}

.check-row {
  min-height: 51px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.option-group {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  align-items: end;
  gap: 4px;
}

.option-group span {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 1px;
}

.option-btn {
  height: 34px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  padding: 0 11px;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
}

.option-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.view { display: none; }
.view.active { display: grid; gap: 16px; }

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 12px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(120px, 1fr));
  gap: 10px;
}

.kpi, .panel {
  min-width: 0;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.kpi {
  padding: 14px;
}

.kpi span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 8px;
}

.kpi strong {
  font-size: 24px;
  letter-spacing: 0;
}

.summary-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  background: #f8fafc;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 6px;
}

.summary-item strong {
  font-size: 18px;
}

.status-layout {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) 2fr;
  gap: 12px;
}

.finance-layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 2fr;
  gap: 12px;
}

.status-card,
.status-metric {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fafc;
  padding: 12px;
}

.status-card.primary {
  background: #eef6f8;
  border-color: #bfd7df;
}

.status-card span,
.status-metric span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 6px;
}

.status-card strong {
  display: block;
  font-size: 22px;
  margin-bottom: 8px;
}

.status-card p {
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
}

.report-section {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid rgba(31, 78, 121, 0.16);
}

.report-section h4 {
  margin: 0 0 5px;
  font-size: 13px;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 10px;
}

.status-metric strong {
  font-size: 18px;
}

.panel {
  padding: 14px;
}

.chart-wrap {
  position: relative;
}

.chart-tooltip {
  position: fixed;
  min-width: 150px;
  pointer-events: none;
  display: none;
  z-index: 5;
  background: rgba(23, 37, 54, 0.94);
  color: #fff;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.4;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
}

.chart-tooltip strong {
  display: block;
  margin-bottom: 4px;
}

.chart-tooltip div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
}

.panel.wide {
  width: 100%;
}

.panel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-head h3 { font-size: 16px; }
.panel-head span { color: var(--muted); font-size: 12px; }

.panel-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 22px;
  background: rgba(15, 23, 42, 0.42);
}

.modal-backdrop[hidden] {
  display: none !important;
}

.modal-card {
  width: min(920px, 100%);
  max-height: min(760px, 92vh);
  overflow: auto;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 18px;
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.24);
}

.modal-head,
.modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.save-status {
  margin-right: auto;
  color: var(--muted);
  font-size: 12px;
}

.icon-btn {
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}

.assumption-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(180px, 1fr));
  gap: 10px;
  margin: 16px 0;
}

.assumption-card {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #f8fafc;
  padding: 10px;
}

.assumption-card input,
.assumption-card select {
  width: 100%;
  margin-top: 7px;
}

.assumption-card small {
  color: var(--muted);
  display: block;
  margin-top: 5px;
}

canvas {
  width: 100%;
  height: clamp(240px, 34vw, 420px);
  display: block;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 720px;
  font-size: 12px;
}

th, td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px;
  text-align: right;
  white-space: nowrap;
}

th:first-child, td:first-child,
th:nth-child(2), td:nth-child(2) {
  text-align: left;
}

th {
  position: sticky;
  top: 0;
  background: #edf3f8;
  z-index: 1;
}

.compact {
  max-height: 460px;
}

.tariff-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 16px;
}

.tariff-table {
  display: grid;
  gap: 10px;
}

.mode-row {
  display: inline-grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 12px;
}

.seg {
  border: 0;
  background: #fff;
  padding: 8px 12px;
  cursor: pointer;
}

.seg.active {
  background: var(--blue);
  color: #fff;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(132px, 1fr));
  gap: 8px;
}

.day {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  padding: 9px;
  min-height: 78px;
}

.day.exclude {
  border-color: #e7b4b1;
  background: #fff5f5;
}

.day .date { font-weight: 700; }
.day .meta { color: var(--muted); font-size: 12px; margin-top: 4px; }
.day .reason { color: var(--red); font-size: 12px; margin-top: 7px; }

.formula table {
  min-width: 1000px;
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: sticky;
    top: 0;
    z-index: 10;
    padding: 12px;
    gap: 12px;
  }

  .brand {
    justify-content: space-between;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand h1 {
    font-size: 16px;
  }

  .nav {
    display: flex;
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: thin;
  }

  .nav-item {
    flex: 0 0 auto;
    height: 36px;
    padding: 0 10px;
    text-align: center;
    white-space: nowrap;
  }

  .source-note {
    display: none;
  }

  .content {
    padding: 16px;
  }

  .kpi-grid,
  .panel-grid,
  .tariff-layout,
  .status-layout,
  .finance-layout,
  .assumption-grid {
    grid-template-columns: 1fr;
  }

  .summary-grid,
  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar h2 {
    font-size: 24px;
  }

  .controls {
    flex-wrap: wrap;
  }

  .controls label {
    flex: 1 1 180px;
  }

  .controls select {
    width: 100%;
  }

  .panel-head {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .panel-actions {
    width: 100%;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .solar-controls {
    align-items: stretch;
  }

  .option-group {
    grid-auto-flow: row;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    min-width: min(100%, 260px);
  }

  .option-group span {
    grid-column: 1 / -1;
  }

  .option-btn {
    width: 100%;
  }

  .modal-card {
    width: min(720px, 100%);
  }
}

@media (max-width: 640px) {
  .sidebar {
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  }

  .brand p {
    display: none;
  }

  .content {
    padding: 12px;
  }

  .toolbar {
    margin-bottom: 12px;
  }

  .toolbar h2 {
    font-size: 22px;
  }

  .controls {
    display: grid;
    grid-template-columns: 1fr;
  }

  .kpi-grid,
  .summary-grid,
  .status-grid {
    grid-template-columns: 1fr;
  }

  .kpi,
  .panel {
    border-radius: 6px;
  }

  .kpi strong {
    font-size: 21px;
  }

  .summary-item strong,
  .status-metric strong {
    font-size: 17px;
  }

  .status-card strong {
    font-size: 20px;
  }

  .panel {
    padding: 12px;
  }

  .panel-head h3 {
    font-size: 15px;
  }

  .panel-actions {
    gap: 6px;
  }

  .panel-actions .option-btn {
    flex: 1 1 120px;
  }

  canvas {
    height: 250px;
  }

  .table-wrap {
    margin: 0 -2px;
    max-width: calc(100vw - 24px);
  }

  table {
    min-width: 620px;
    font-size: 11px;
  }

  th,
  td {
    padding: 7px 8px;
  }

  .formula table,
  #financeAnnualTable {
    min-width: 920px;
  }

  .solar-controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .option-group {
    width: 100%;
    grid-template-columns: 1fr 1fr;
  }

  .modal-backdrop {
    align-items: stretch;
    padding: 0;
  }

  .modal-card {
    width: 100%;
    max-height: 100vh;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    padding: 14px;
  }

  .modal-head {
    align-items: flex-start;
  }

  .modal-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .save-status {
    grid-column: 1 / -1;
    margin-right: 0;
  }

  .calendar-grid {
    grid-template-columns: 1fr;
  }
}