*, *::before, *::after { box-sizing: border-box; }
body { font-family: system-ui, -apple-system, sans-serif; margin: 0; background: #f8fafc; color: #1e293b; line-height: 1.6; }
.container { max-width: 680px; margin: 0 auto; padding: 1.5rem 1rem; }
header { text-align: center; margin-bottom: 2rem; }
header a { color: #4f46e5; text-decoration: none; font-size: 0.875rem; }
h1 { font-size: 1.75rem; margin: 0.5rem 0; }
h2 { font-size: 1.25rem; margin-top: 2rem; }
.card { background: #fff; border: 1px solid #e2e8f0; border-radius: 0.75rem; padding: 1.5rem; margin-bottom: 1.5rem; }
label { display: block; font-size: 0.875rem; font-weight: 600; margin-bottom: 0.375rem; color: #475569; }
input[type="date"], input[type="number"], select {
  width: 100%; padding: 0.625rem 0.875rem; border: 1px solid #cbd5e1;
  border-radius: 0.5rem; font-size: 1rem; margin-bottom: 1rem;
}
.custom-days { display: none; }
button {
  background: #4f46e5; color: #fff; border: none; padding: 0.75rem 1.5rem;
  border-radius: 0.5rem; font-size: 1rem; font-weight: 600; cursor: pointer; width: 100%;
}
button:hover { background: #4338ca; }
.result-box {
  background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 0.75rem;
  padding: 1.25rem; margin-top: 1rem; display: none;
}
.result-date { font-size: 1.5rem; font-weight: 700; color: #1d4ed8; }
.result-days { font-size: 0.875rem; color: #64748b; margin-top: 0.25rem; }
.result-days.urgent { color: #dc2626; font-weight: 600; }
.warning-box {
  background: #fff7ed; border: 1px solid #fed7aa; border-radius: 0.75rem;
  padding: 1rem 1.25rem; margin-top: 0.75rem; font-size: 0.875rem; color: #92400e; display: none;
}
.cta { text-align: center; margin: 1.5rem 0; }
.result-box .cta { margin-top: 1rem; }
.cta a {
  display: inline-block; background: #4f46e5; color: #fff; text-decoration: none;
  padding: 0.75rem 1.5rem; border-radius: 0.5rem; font-weight: 600;
}
.faq-item { border-top: 1px solid #e2e8f0; padding: 1rem 0; }
.faq-item h3 { font-size: 1rem; margin: 0 0 0.5rem; }
.faq-item p { margin: 0; font-size: 0.875rem; color: #475569; }
footer { text-align: center; font-size: 0.75rem; color: #94a3b8; margin-top: 2rem; padding-bottom: 2rem; }
footer a { color: #94a3b8; }

@media (prefers-color-scheme: dark) {
  body { background: #0f172a; color: #f1f5f9; }
  input, select { background: #1e293b; color: #f1f5f9; border-color: #334155; }
  label { color: #94a3b8; }
  .card { background: #1e293b; border-color: #334155; }
  .result-box { background: #0f3460; border-color: #1d4ed8; }
  .result-date { color: #93c5fd; }
  .warning-box { background: #1c1007; border-color: #92400e; }
  .faq-item { border-color: #334155; }
  .faq-item p { color: #94a3b8; }
}