:root {
  --bg: #f6f3f0;
  --ink: #1f2937;
  --muted: #6b7280;
  --card: #ffffff;
  --line: rgba(31, 41, 55, 0.1);
  --accent: #ff7a59;
  --accent-2: #2f80ed;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans JP', 'Segoe UI', sans-serif;
  background: radial-gradient(circle at 10% 10%, rgba(255, 122, 89, 0.12), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(47, 128, 237, 0.1), transparent 45%),
    var(--bg);
  color: var(--ink);
  line-height: 1.9;
  padding: 40px 20px 64px;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.header {
  background: var(--card);
  border-radius: 18px;
  padding: 24px 28px;
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
}

.header h1 {
  font-size: 1.8rem;
  margin-bottom: 6px;
}

.header p {
  color: var(--muted);
}

.lang-link {
  display: inline-flex;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid rgba(107, 114, 128, 0.5);
}

.section {
  background: var(--card);
  border-radius: 16px;
  padding: 22px 26px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.section h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.section p {
  color: var(--ink);
  margin-bottom: 10px;
}

.section .muted {
  color: var(--muted);
  font-size: 0.95rem;
}

.list {
  margin-top: 8px;
  padding-left: 18px;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  body {
    padding: 28px 16px 48px;
  }

  .header h1 {
    font-size: 1.5rem;
  }
}