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

:root {
  --accent: #007AFF;
  --accent2: #00C7BE;
  --bg: #f9f9f9;
  --text: #333;
  --muted: #666;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
    "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
}

/* コンテナ設定 */
.container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ヘッダー */
header {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  text-align: center;
  padding: 80px 0;
}

header h1 {
  font-size: 2.8em;
  margin-bottom: 10px;
  font-weight: bold;
}

header .tagline {
  font-size: 1.2em;
  margin-bottom: 26px;
  opacity: 0.95;
}

header .note {
  margin-top: 14px;
  font-size: 0.95em;
  opacity: 0.9;
}

/* ダウンロードボタン */
.download-btn {
  display: inline-block;
  background: #fff;
  color: var(--accent);
  padding: 12px 24px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: bold;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.download-btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* メインコンテンツ */
main {
  padding: 60px 0;
}

section {
  margin-bottom: 80px;
}

section h2 {
  font-size: 1.8em;
  margin-bottom: 24px;
  text-align: center;
  color: var(--text);
}

section h2::after {
  content: "";
  width: 50px;
  height: 3px;
  background: var(--accent);
  display: block;
  margin: 10px auto 0;
  border-radius: 2px;
}

section p {
  font-size: 1.05em;
  margin-bottom: 20px;
  text-align: center;
  color: #555;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

/* 特徴リスト */
ul {
  list-style: none;
  padding: 0;
  max-width: 800px;
  margin: 0 auto;
}

ul li {
  font-size: 1.05em;
  margin-bottom: 20px;
  padding-left: 30px;
  position: relative;
  color: #444;
}

ul li::before {
  content: "✔";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent);
  font-weight: bold;
  font-size: 1.2em;
}

/* プレミアムカード */
.card {
  max-width: 760px;
  margin: 24px auto 0;
  background: #fff;
  border: 1px solid #eee;
  border-radius: 18px;
  padding: 22px 18px;
  box-shadow: 0 6px 16px rgba(0,0,0,0.06);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card h3 {
  font-size: 1.2em;
  color: var(--text);
  margin: 0;
}

.badge {
  display: inline-block;
  background: rgba(0, 122, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(0, 122, 255, 0.28);
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.85em;
  font-weight: bold;
  white-space: nowrap;
}

.card-list {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 720px;
}

.card-list li {
  margin-bottom: 14px;
}

.card-note {
  margin-top: 10px;
  font-size: 0.95em;
  color: #777;
  text-align: center;
}

/* FAQ */
.faq {
  max-width: 760px;
  margin: 0 auto;
}

details {
  background: #fff;
  border: 1px solid #eee;
  border-radius: 14px;
  padding: 14px 14px;
  margin-bottom: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.04);
}

summary {
  cursor: pointer;
  font-weight: bold;
  color: #333;
  outline: none;
}

details p {
  margin-top: 10px;
  text-align: left;
  color: #555;
  max-width: none;
}

/* フッター */
footer {
  background: #fff;
  color: var(--muted);
  text-align: center;
  padding: 40px 0;
  font-size: 0.9em;
  border-top: 1px solid #eee;
}

.footer-nav {
  margin-bottom: 16px;
}

.footer-nav a {
  color: var(--muted);
  text-decoration: none;
  margin: 0 10px;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--accent);
}

.copyright {
  color: #999;
  font-size: 0.85em;
}

/* メディアクエリ（PC・タブレット向け調整） */
@media (min-width: 768px) {
  header h1 {
    font-size: 3.5em;
  }

  header .tagline {
    font-size: 1.4em;
  }

  section p {
    text-align: center;
  }

  ul li {
    text-align: left;
  }
}