/* ===== RESET & BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: #f5f7fc;
  color: #1e293b;
  line-height: 1.5;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ===== HEADER ===== */
header {
  background: #1e2b4f;
  color: white;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  border-bottom: 1px solid #2a3c5e;
}

.logo span {
  font-size: 1.5rem;
  font-weight: 600;
  color: white;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  flex-wrap: wrap;
}

.nav-link {
  text-decoration: none;
  font-weight: 500;
  color: #e0e7ff;
  padding: 0.5rem 0;
  transition: color 0.2s, border-color 0.2s;
  border-bottom: 2px solid transparent;
}

.nav-link:hover {
  color: white;
  border-bottom-color: white;
}

.nav-link.active {
  color: white;
  border-bottom-color: white;
  font-weight: 600;
}

/* ===== MAIN CONTENT ===== */
main {
  max-width: 1300px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  flex: 1;
  width: 100%;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: #0b2b4a;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-left: 6px solid #1e2b4f;
  padding-left: 1.2rem;
}

/* ===== TRACKING CONTROLS ===== */
.tracking-controls {
  display: flex;
  gap: 15px;
  align-items: center;
  flex-wrap: wrap;
  background: white;
  padding: 1rem 1.8rem;
  border-radius: 50px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.03);
  margin-bottom: 1.5rem;
  border: 1px solid #dee7f2;
}

.tracking-controls label {
  font-weight: 600;
  color: #1e3a6f;
}

select {
  padding: 8px 18px;
  border-radius: 30px;
  border: 1px solid #cbd5e1;
  background: white;
  font-size: 1rem;
  cursor: pointer;
  outline: none;
  transition: border 0.2s;
  min-width: 200px;
}

select:focus {
  border-color: #1e2b4f;
  box-shadow: 0 0 0 3px rgba(30, 43, 79, 0.1);
}

.btn-secondary {
  background: #eef3fc;
  border: 1px solid #b6cae0;
  color: #1e3a6f;
  padding: 8px 20px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: #dde7f5;
  border-color: #1e2b4f;
  color: #0f2a4a;
}

#lastUpdate {
  margin-left: auto;
  font-size: 0.9rem;
  color: #4a627a;
  background: #f0f4fa;
  padding: 6px 16px;
  border-radius: 30px;
}

/* ===== MAP ===== */
#map {
  height: 520px;
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  border: 1px solid #dce5ec;
  z-index: 1;
  margin-bottom: 1.2rem;
}

/* ===== LEGEND ===== */
.tracking-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  background: white;
  padding: 0.8rem 1.8rem;
  border-radius: 40px;
  margin-bottom: 1.5rem;
  border: 1px solid #dee7f2;
  justify-content: center;
}

.legend-dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  margin-right: 6px;
  border: 2px solid white;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.tracking-legend span {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  color: #1e3a5f;
  font-weight: 500;
}

/* ===== NOTE ===== */
.note {
  margin-top: 0.5rem;
  padding: 0.8rem 1.8rem;
  background: #e9f0fe;
  border-radius: 40px;
  display: inline-block;
  color: #10355e;
  font-weight: 500;
  border-left: 4px solid #1e2b4f;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 1.5rem;
  background: #ffffff;
  border-top: 1px solid #e2e8f0;
  color: #4e6580;
  font-size: 0.95rem;
  margin-top: 2rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 700px) {
  header {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
    text-align: center;
  }
  .nav-links {
    justify-content: center;
    gap: 1.2rem;
  }
  h1 {
    font-size: 1.8rem;
  }
  .tracking-controls {
    flex-direction: column;
    align-items: stretch;
  }
  #lastUpdate {
    margin-left: 0;
    text-align: center;
  }
  #map {
    height: 400px;
  }
  .tracking-legend {
    gap: 0.8rem 1.2rem;
  }
}