:root {
  --bg: #f3f6f9;
  --card: #ffffff;
  --ink: #172b4d;
  --muted: #5e6c84;
  --accent: #1b7f79;
  --danger: #b42318;
  --border: #d6dde6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(180deg, #eef3f8 0%, #f9fbfd 100%);
  color: var(--ink);
}

.page {
  width: min(1200px, 92vw);
  margin: 24px auto 48px;
  display: grid;
  gap: 16px;
}

header h1 {
  margin: 0;
}

header p {
  margin: 8px 0 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.06);
}

.weights-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.weights-grid label {
  display: grid;
  gap: 6px;
  font-size: 14px;
}

.weights-grid input {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

button {
  grid-column: 1 / -1;
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button:hover {
  filter: brightness(1.03);
}

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

.metric-grid article {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.metric-grid h3 {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.metric-grid p {
  margin: 8px 0 0;
  font-size: 24px;
  font-weight: 700;
}

img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.error {
  border-color: #f3b9b3;
}

.error pre {
  white-space: pre-wrap;
  color: var(--danger);
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(243, 246, 249, 0.85);
  backdrop-filter: blur(3px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 999;
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
}

.loading-overlay[hidden] {
  display: none;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.table-wrap {
  overflow-x: auto;
  margin-top: 12px;
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.table-wrap thead tr {
  background: var(--accent);
  color: #fff;
}

.table-wrap th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.table-wrap td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--ink);
}

.table-wrap tbody tr:nth-child(even) {
  background: #f5f8fc;
}

.table-wrap tbody tr:hover {
  background: #eaf3f2;
}