* {
  box-sizing: border-box;
}

:root {
  --ink: #111b22;
  --deep: #071012;
  --panel: #ffffff;
  --line: #d7e4e8;
  --text: #22313c;
  --muted: #536570;
  --teal: #5dcabb;
  --green: #63ef96;
  --blue: #149cf2;
}

body {
  margin: 0;
  background: #f2f6f7;
  color: var(--text);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.5;
}

.page-header {
  background:
    radial-gradient(circle at 78% 20%, rgba(93, 202, 187, 0.2), transparent 30%),
    linear-gradient(120deg, #05090b 0%, var(--ink) 48%, #09201f 100%);
  color: white;
  padding: 24px 18px 38px;
}

.brand-lockup {
  width: min(1050px, calc(100% - 28px));
  margin: 0 auto 28px;
}

.brand-lockup a {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: Arial, sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: white;
  text-decoration: none;
  width: fit-content;
}

.brand-lockup img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

.header-copy {
  width: min(840px, calc(100% - 28px));
  margin: 0 auto;
  text-align: center;
}

.header-copy h1 {
  margin: 0 0 12px;
  font-size: 2rem;
  font-weight: 700;
}

.project-meta {
  color: var(--green);
  font-family: Arial, sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.header-copy p {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: #d6e1e2;
}

main {
  width: min(1050px, calc(100% - 28px));
  margin: 22px auto 40px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 18px;
}

.source-note {
  border-left: 5px solid var(--teal);
}

.source-note a {
  color: #087d91;
  font-weight: 700;
}

.image-section p {
  margin-top: 0;
  color: var(--muted);
}

.image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

figure {
  margin: 0;
}

figure img {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
}

figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.94rem;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items: end;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 700;
}

select,
input[type="file"] {
  width: 100%;
  padding: 9px;
  border: 1px solid #a9bec3;
  border-radius: 4px;
  background: white;
  font: inherit;
}

.status {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-style: italic;
}

h2 {
  margin: 0 0 8px;
  color: #122733;
  font-size: 1.35rem;
}

.chart-section p {
  margin-top: 0;
  color: var(--muted);
}

#crossInsight {
  margin-top: 0;
  color: var(--muted);
}

.chart-box {
  position: relative;
  height: 340px;
}

.heatmap {
  overflow-x: auto;
  padding-bottom: 6px;
}

.heatmap-grid {
  display: grid;
  grid-template-columns: 92px repeat(24, 38px);
  gap: 3px;
  min-width: 1010px;
}

.heatmap-cell,
.heatmap-label {
  min-height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  font-size: 0.78rem;
}

.heatmap-label {
  background: #e8f2f3;
  color: #374957;
  font-weight: 700;
}

.heatmap-cell {
  border: 1px solid rgba(7, 16, 18, 0.08);
  color: #17314a;
}

.empty-state {
  padding: 18px;
  border: 1px dashed #a9bec3;
  color: var(--muted);
  background: #f8fafb;
}

.disclaimer {
  background: #f8fbfb;
}

@media (max-width: 760px) {
  .controls {
    grid-template-columns: 1fr;
  }

  .header-copy h1 {
    font-size: 1.55rem;
  }

  .brand-lockup {
    margin-bottom: 22px;
  }

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

  .chart-box {
    height: 300px;
  }
}