:root {
  color-scheme: light dark;
  --background: #f7f9fb;
  --panel: rgba(255, 255, 255, 0.9);
  --border: #d0d7de;
  --accent: #2563eb;
  --text: #1f2933;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 2rem 5vw 1rem;
  background: linear-gradient(120deg, #eff6ff, #fefce8);
  color: #0f172a;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

header p {
  margin: 0;
  max-width: 60ch;
}

main {
  flex: 1;
  display: grid;
  gap: 1.5rem;
  padding: 1.5rem 5vw 3rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.controls,
.stats,
.map-section,
.notes {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.file-input {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.2rem;
  border-radius: 999px;
  border: 1px dashed var(--accent);
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

.file-input input {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

button {
  padding: 0.75rem 1.2rem;
  border-radius: 999px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  color: white;
  background: var(--accent);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:disabled {
  cursor: not-allowed;
  background: #9ca3af;
  box-shadow: none;
}

button:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.2);
}

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

.stats-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.75rem;
  font-size: 0.95rem;
}

.stats-table th,
.stats-table td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: right;
}

.stats-table th {
  text-align: left;
  background: rgba(37, 99, 235, 0.08);
}

.stats-table tbody tr:nth-child(even) {
  background: rgba(148, 163, 184, 0.12);
}

.notes ul {
  margin: 0;
  padding-left: 1.2rem;
  line-height: 1.5;
}

@media (max-width: 900px) {
  header {
    text-align: center;
  }

  header p {
    margin: 0 auto;
  }

  main {
    grid-template-columns: 1fr;
  }

  #map {
    height: 360px;
  }
}