:root {
  --primary: #004080; /* main blue */
  --secondary: #474747; /* dark gray */
  --bg: #fafeff; /* very light background */
}

/* Reset / base */
* { box-sizing: border-box; }
html,body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--secondary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  line-height: 1.45;
  padding: 18px;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 14px;
  background: #ffffff;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
header img { height: 48px; }
header h1 { margin: 0; font-size: 18px; color: var(--primary); }

/* Main containers */
.container { max-width: 960px; margin: 18px auto; background: #ffffff; padding: 18px; border-radius: 10px; box-shadow: 0 6px 18px rgba(0,0,0,0.04); }
.container h1 { margin-top: 0; color: var(--primary); }

/* Package cards */
.package-card {
  border: 1px solid rgba(0,0,0,0.06);
  padding: 12px 14px;
  margin: 10px 0;
  border-radius: 8px;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, border-color .12s;
  background: #fff;
}
.package-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,64,128,0.06); }
.package-card.selected { border-color: var(--primary); box-shadow: 0 12px 30px rgba(0,64,128,0.10); }
.package-card h2 { margin: 0 0 8px 0; color: var(--primary); }
.package-card ul { margin: 0; padding-left: 18px; color: var(--secondary); }
.package-card li { margin: 4px 0; }

/* Buttons */
button {
  background: var(--primary);
  color: var(--bg);
  border: none;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
button:hover { background: #0f7f91; }
button:disabled { background: #ccc; cursor: not-allowed; }
button + button { margin-left: 8px; }

/* Forms / inputs */
input[type="text"], input[type="email"], input[type="number"], input[type="tel"], textarea, select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid rgba(0,0,0,0.08);
  border-radius: 6px;
  margin: 8px 0 12px 0;
  background: #fff;
  color: var(--secondary);
}

/* Submodule list */
.submodules { margin: 0.5rem 0 1rem 1.25rem; }
.submodules label { display: block; margin: 6px 0; }

/* Summary */
.summary { background: #f1f9f9; border: 1px solid #cfeeee; padding: 1rem; border-radius: 10px; }
.summary p { margin: 6px 0; }

/* Responsive */
@media (max-width: 800px) {
  .container { margin: 12px; padding: 14px; }
  header h1 { font-size: 15px; }
}