* { box-sizing: border-box; }

body {
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f6f8f6;
  color: #1b1b1b;
  margin: 0;
  padding: 0 1rem 3rem;
}

header {
  max-width: 640px;
  margin: 0 auto;
  padding-top: 2rem;
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: #555;
  margin-top: 0;
}

.progress-summary {
  background: #e6f0e6;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: #2e7d32;
  margin: 1rem 0;
}

main {
  max-width: 640px;
  margin: 0 auto;
}

.week {
  background: #fff;
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.week h2 {
  font-size: 1.1rem;
  margin-top: 0;
}

ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-top: 1px solid #eee;
}

.step:first-child {
  border-top: none;
}

.step input[type="checkbox"] {
  margin-top: 0.3rem;
  width: 1.1rem;
  height: 1.1rem;
  accent-color: #2e7d32;
}

.step-title {
  font-weight: 600;
  color: #1b1b1b;
  text-decoration: none;
}

.step-title:hover {
  text-decoration: underline;
}

.step-desc {
  margin: 0.15rem 0 0;
  color: #666;
  font-size: 0.9rem;
}

.step.completed .step-title {
  color: #2e7d32;
}

.step.completed .step-desc {
  color: #999;
}

footer {
  max-width: 640px;
  margin: 2rem auto 0;
  color: #888;
  font-size: 0.85rem;
  text-align: center;
}

footer a {
  color: #2e7d32;
}