* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  background: #081827;
  color: #eff7ff;
}

.site-header {
  padding: 24px 20px 8px;
  text-align: center;
}

.site-header-row {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.site-header-titles {
  flex: 1 1 280px;
  text-align: center;
}

.site-header-actions {
  flex: 0 0 auto;
}

.site-header h1 {
  margin: 0;
  font-size: 2rem;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-family: inherit;
}

.btn-secondary {
  background: #143652;
  color: #e8f4ff;
  border-color: #2f5879;
}

.btn-secondary:hover {
  background: #1a4570;
}

.btn-primary {
  background: #2a8fd4;
  color: #fff;
  border-color: #4aa5e6;
}

.btn-primary:hover {
  background: #2379b5;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.upload-form label {
  display: block;
  margin: 10px 0 6px;
  color: #b7d7f2;
}

.upload-form input[type="file"] {
  width: 100%;
  max-width: 420px;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #2f5879;
  background: #0b1e2f;
  color: #eff7ff;
}

.upload-preview-wrap {
  margin-top: 14px;
}

.upload-preview-wrap img {
  max-width: 100%;
  max-height: 320px;
  border-radius: 8px;
  border: 1px solid #2f5879;
}

.upload-status {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
}

.upload-status.ok {
  background: #143d2e;
  border: 1px solid #2a8f5c;
  color: #c8f5dc;
}

.upload-status.err {
  background: #3d1418;
  border: 1px solid #8f2a35;
  color: #f5c8cc;
}

.upload-status.info {
  background: #143652;
  border: 1px solid #2f5879;
  color: #cae4ff;
}

.back-link {
  display: inline-block;
  margin-bottom: 12px;
  color: #8cb5d8;
  text-decoration: none;
}

.back-link:hover {
  color: #cae4ff;
  text-decoration: underline;
}

.upload-submit-row {
  margin-top: 14px;
}

.subtitle {
  margin-top: 6px;
  color: #9fc4e6;
}

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.card {
  background: #10263a;
  border: 1px solid #1d3b54;
  border-radius: 12px;
  padding: 14px;
}

.controls label {
  display: block;
  margin: 8px 0 6px;
  color: #b7d7f2;
}

select {
  width: 100%;
  max-width: 420px;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #2f5879;
  background: #0b1e2f;
  color: #eff7ff;
}

.lake-description {
  margin-top: 10px;
  color: #cae4ff;
}

.source-note {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #8cb5d8;
}

.kpi-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.kpi h3 {
  margin: 0 0 8px;
  color: #b8d6ee;
}

.kpi-value {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.chart-card canvas {
  width: 100%;
  height: auto;
  background: #0b1e2f;
  border-radius: 8px;
}

#map {
  width: 100%;
  height: 420px;
  border-radius: 8px;
  border: 1px solid #2f5879;
}

.map-caption {
  margin: 8px 0 0;
  font-size: 0.9rem;
  color: #8cb5d8;
}

.site-footer {
  text-align: center;
  padding: 8px 0 30px;
  color: #7fa5c5;
}

@media (min-width: 900px) {
  .layout {
    grid-template-columns: 1fr 1fr;
  }

  .controls,
  .chart-card,
  .map-card {
    grid-column: 1 / -1;
  }
}