:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #111827;
}

/* Reset */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Layout */
.wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 32px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

/* Typography */
h1 {
  margin: 0 0 10px;
  font-size: 2rem;
  color: var(--accent);
}

.effective {
  color: var(--muted);
  margin-bottom: 25px;
}

h2 {
  margin-top: 28px;
  margin-bottom: 10px;
  font-size: 1.15rem;
}

p {
  margin: 8px 0;
}

ul {
  padding-left: 22px;
  margin-top: 8px;
}

li {
  margin-bottom: 6px;
}

/* Email */
.email a {
  color: #2563eb;
  font-weight: 500;
  text-decoration: none;
}

.email a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

/* Mobile */
@media (max-width: 640px) {
  .card {
    padding: 20px;
    border-radius: 14px;
  }

  h1 {
    font-size: 1.6rem;
  }
}