body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0e1f2f;
  color: #e4e7eb;
}

.header {
  text-align: center;
  padding: 40px 20px;
  background: #132c44;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}
.header h1 {
  margin: 0;
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 1px;
  color: #4dd0e1;
}
.header p {
  margin-top: 8px;
  font-size: 15px;
  opacity: 0.8;
}

.main {
  max-width: 1100px;
  margin: auto;
  padding: 30px 20px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
}

.panel {
  background: #162c3b;
  padding: 20px;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 14px;
  opacity: 0.9;
}

.field input {
  padding: 8px;
  border-radius: 6px;
  border: none;
  background: #1f3d52;
  color: #e4e7eb;
}

.btn {
  padding: 10px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: 0.2s;
}

.btn.gen {
  background: #4caf50;
  color: white;
}
.btn.gen:hover {
  background: #43a047;
}

.btn.opt {
  background: #0288d1;
  color: white;
}
.btn.opt:hover {
  background: #0277bd;
}

.status {
  margin-top: 5px;
  font-size: 14px;
  min-height: 20px;
}

.canvas-box {
  position: relative;
  background: #132c44;
  padding: 10px;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  text-align: center;
}

#mapCanvas {
  border-radius: 10px;
  background: #0c1a26;
}

.tooltip {
  position: absolute;
  padding: 6px 10px;
  background: rgba(0, 0, 0, 0.85);
  border-radius: 4px;
  font-size: 12px;
  pointer-events: none;
  color: white;
}

.results {
  grid-column: span 2;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.result-card {
  background: #162c3b;
  padding: 15px;
  border-radius: 10px;
  min-width: 140px;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.25);
  transition: 0.2s;
}

.result-card:hover {
  background: #1d3a52;
}

.result-card h3 {
  margin: 0 0 6px 0;
  font-size: 16px;
}

.result-card p {
  margin: 0;
  font-size: 14px;
}

/* ================================
   RESPONSIVE DESIGN
================================ */

/* Tablets (≤ 992px) */
@media (max-width: 992px) {
  .main {
    grid-template-columns: 1fr;
  }

  .canvas-box {
    padding: 5px;
  }

  #mapCanvas {
    width: 100%;
    height: auto;
  }
}

/* Smartphones (≤ 768px) */
@media (max-width: 768px) {

  .header h1 {
    font-size: 26px;
  }

  .main {
    padding: 20px 10px;
  }

  .panel {
    padding: 15px;
    gap: 12px;
  }

  .field input {
    padding: 6px;
  }

  .btn {
    padding: 8px;
    font-size: 14px;
  }

  #mapCanvas {
    width: 100%;
    height: auto;
  }

  .results {
    flex-direction: column;
  }

  .result-card {
    width: 100%;
  }
}

/* Smartphones pequeños (≤ 480px) */
@media (max-width: 480px) {

  .header p,
  .header h3 {
    font-size: 13px;
  }

  .panel {
    padding: 12px;
  }

  .field label {
    font-size: 13px;
  }

  .btn {
    width: 100%;
  }

  .canvas-box {
    padding: 5px;
  }

  #mapCanvas {
    width: 100%;
    height: auto;
  }

  .result-card h3 {
    font-size: 14px;
  }

  .result-card p {
    font-size: 12px;
  }
}