:root {
  color-scheme: light;
  --ink: oklch(0.17 0.004 260);
  --muted: oklch(0.48 0.006 260);
  --soft: oklch(0.67 0.006 260);
  --line: oklch(0.88 0.004 260);
  --surface: oklch(0.975 0.003 260);
  --panel: oklch(0.995 0.002 260);
  --field: oklch(1 0 0);
  --hover: oklch(0.94 0.004 260);
  --inverse: oklch(0.985 0.002 260);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--surface);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  min-height: 38px;
  border: 1px solid var(--ink);
  border-radius: 7px;
  padding: 0 14px;
  color: var(--inverse);
  background: var(--ink);
  cursor: pointer;
  font-weight: 700;
  white-space: nowrap;
}

button:hover:not(:disabled) {
  background: oklch(0.24 0.004 260);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

button.secondary {
  color: var(--ink);
  background: var(--field);
  border-color: var(--line);
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 730;
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px 11px;
  color: var(--ink);
  background: var(--field);
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--ink);
  box-shadow: 0 0 0 3px oklch(0.91 0.004 260);
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 26px 0 44px;
}

.topbar,
.panel-head,
.rank-top {
  display: flex;
  align-items: center;
}

.topbar {
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.topbar h1 {
  margin: 0;
  max-width: 680px;
  font-size: 28px;
  line-height: 1.12;
  letter-spacing: 0;
}

.eyebrow,
.panel-label {
  margin: 0 0 7px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.workspace {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.panel,
.summary-card,
.rank-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.panel {
  padding: 18px;
}

.panel-head {
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-head.compact {
  margin-bottom: 12px;
}

.panel h2 {
  margin: 0;
  font-size: 18px;
  line-height: 1.2;
}

.input-grid {
  display: grid;
  grid-template-columns: minmax(260px, 0.82fr) minmax(0, 1fr);
  gap: 14px;
}

.upload-zone {
  display: grid;
  align-content: center;
  min-height: 142px;
  border: 1px dashed var(--soft);
  border-radius: 8px;
  padding: 14px;
  background: var(--field);
}

.upload-zone input[type="file"] {
  font-size: 13px;
}

.upload-zone input[type="file"]::file-selector-button {
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: 5px;
  margin-right: 10px;
  padding: 0 10px;
  color: var(--ink);
  background: var(--field);
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

.upload-zone p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  overflow-wrap: anywhere;
}

.controls-grid,
.details-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.advanced-panel {
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 12px;
}

.advanced-panel summary {
  width: max-content;
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  font-weight: 720;
}

.details-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 12px;
}

.summary-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.summary-card {
  padding: 12px;
}

.summary-card span,
.score-grid span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 720;
}

.summary-card strong {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.35;
}

.empty-state {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 14px;
  color: var(--muted);
  background: var(--field);
  font-size: 14px;
}

.recommendation-output {
  display: grid;
  gap: 10px;
}

.tradeoff-panel {
  display: grid;
  grid-template-columns: minmax(220px, 0.42fr) minmax(320px, 1fr);
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--field);
}

.tradeoff-copy h3 {
  margin: 0;
  font-size: 16px;
  line-height: 1.25;
}

.tradeoff-copy p {
  max-width: 42ch;
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.tradeoff-chart {
  position: relative;
  min-height: 210px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    var(--panel);
  background-size: 25% 25%;
}

.tradeoff-chart::before,
.tradeoff-chart::after {
  content: "";
  position: absolute;
  background: var(--ink);
}

.tradeoff-chart::before {
  left: 8%;
  bottom: 10%;
  width: 84%;
  height: 1px;
}

.tradeoff-chart::after {
  left: 8%;
  bottom: 10%;
  width: 1px;
  height: 80%;
}

.axis-label {
  position: absolute;
  color: var(--muted);
  font-size: 11px;
  font-weight: 760;
}

.axis-label.y {
  left: 12px;
  top: 10px;
}

.axis-label.x {
  right: 12px;
  bottom: 8px;
}

.chart-dot {
  position: absolute;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  min-height: 24px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  padding: 0;
  color: var(--ink);
  background: var(--field);
  transform: translate(-50%, 50%);
}

.chart-dot.selected {
  width: 30px;
  height: 30px;
  min-height: 30px;
  color: var(--inverse);
  background: var(--ink);
}

.chart-dot span {
  font-size: 11px;
  font-weight: 850;
}

.chart-legend {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  color: var(--muted);
  font-size: 12px;
}

.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.chart-legend i {
  display: grid;
  place-items: center;
  width: 17px;
  height: 17px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  background: var(--panel);
  font-style: normal;
  font-size: 10px;
  font-weight: 780;
}

.rank-card {
  padding: 14px;
}

.rank-top {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.rank-number {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  color: var(--inverse);
  background: var(--ink);
  font-weight: 800;
}

.rank-card h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.2;
}

.rank-card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.metric-tile {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 10px;
  background: var(--field);
}

.score-grid strong {
  display: block;
  margin-top: 5px;
  font-size: 15px;
}

.metric-bar {
  height: 5px;
  margin-top: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--hover);
}

.metric-bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--ink);
}

.risk-note {
  display: flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  max-width: 100%;
  border: 1px solid oklch(0.83 0.05 78);
  border-radius: 7px;
  margin-top: 10px;
  padding: 8px 10px;
  color: oklch(0.32 0.055 74);
  background: oklch(0.96 0.025 82);
  font-size: 12px;
  line-height: 1.35;
}

.risk-note strong {
  color: inherit;
}

.explain-card {
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line);
  margin-top: 14px;
  padding-top: 14px;
}

.explain-section {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px;
  background: var(--field);
}

.explain-section h4 {
  margin: 0 0 6px;
  font-size: 14px;
}

.explain-section p,
.explain-section ul {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.explain-section ul {
  padding-left: 18px;
}

.reason-list {
  margin-top: 8px !important;
}

.formula {
  margin-top: 8px !important;
  color: var(--ink) !important;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.score-breakdown {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.score-breakdown div {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px;
  background: var(--panel);
}

.score-breakdown span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 720;
}

.score-breakdown strong {
  display: block;
  margin-top: 4px;
  font-size: 13px;
}

@media (max-width: 860px) {
  .app-shell {
    width: min(100% - 20px, 760px);
    padding-top: 14px;
  }

  .topbar,
  .input-grid,
  .controls-grid,
  .details-grid,
  .summary-panel,
  .score-grid,
  .tradeoff-panel {
    display: grid;
    grid-template-columns: 1fr;
  }

  .rank-top {
    grid-template-columns: 34px minmax(0, 1fr);
  }
}