/* リセット & 基本 */
* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Noto Sans', 'Helvetica Neue', Arial, sans-serif; }
html, body { height: 100%; }
body { background: #f0f4f8; color: #333; line-height: 1.6; -webkit-font-smoothing:antialiased; }

/* コンテナ（中央寄せ / 横幅制限） */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ヘッダー */
header {
  background: #007BFF;
  color: #fff;
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
header .logo { font-weight: 700; font-size: 1.1rem; }
header nav { display: flex; gap: 12px; align-items: center; }
header a { color: #fff; text-decoration: none; font-weight: 600; }
header a:focus { outline: 3px solid rgba(255,255,255,0.18); outline-offset: 3px; border-radius: 6px; }

/* ヒーロー */
.hero {
  text-align: center;
  padding: 56px 20px;
  background: linear-gradient(180deg, #eaf3ff 0%, #e6f0ff 100%);
  margin-bottom: 20px;
  border-radius: 10px;
}
.hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.hero p { font-size: 1.05rem; margin-bottom: 20px; color: #234; max-width: 820px; margin-left: auto; margin-right: auto; }
.hero a {
  background: #007BFF;
  color: #fff;
  padding: 12px 22px;
  text-decoration: none;
  border-radius: 8px;
  transition: transform .12s ease, box-shadow .12s ease, .12s;
  display: inline-block;
}
.hero a:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(16,64,133,0.12); background: #0056b3; }

/* ツールカードラッパー */
/* 最大3列レイアウト（モバイル1列、600px以上2列、1000px以上3列） */
.tools {
  display: grid;
  gap: 20px;
  padding: 28px 0;
  grid-template-columns: 1fr;
}
@media (min-width: 600px) {
  .tools { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .tools { grid-template-columns: repeat(3, 1fr); }
}

/* カード */
.card {
  background: #fff;
  border-radius: 10px;
  padding: 18px;
  box-shadow: 0 6px 18px rgba(16,40,80,0.06);
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 140px;
  transition: transform .12s ease, box-shadow .12s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 18px 40px rgba(16,40,80,0.08); }
.card h3 { margin-bottom: 6px; color: #0666d6; font-size: 1.05rem; }
.card p { font-size: 0.95rem; color: #555; line-height: 1.45; }
.card .meta { font-size: 0.85rem; color: #7a8696; }

/* アクション（ボタンリンク） */
.card a {
  margin-top: auto;
  display: inline-block;
  padding: 9px 14px;
  background: #007BFF;
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 700;
  transition: .12s, transform .12s;
}
.card a:hover { background: #0056b3; transform: translateY(-2px); }
.card a[aria-disabled="true"], .card a.disabled {
  background: #cfe3ff;
  color: #6b778c;
  pointer-events: none;
  cursor: default;
}

/* フッター */
footer {
  background: transparent;
  color: #6b7280;
  padding: 18px 0;
  text-align: center;
  font-size: 0.92rem;
  margin-top: 32px;
}
footer a { color: #0666d6; text-decoration: none; margin: 0 6px; }
footer a:hover { text-decoration: underline; }

/* 小さい画面での微調整 */
@media (max-width: 600px) {
  .hero { padding: 36px 14px; border-radius: 8px; }
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.98rem; }
  header { padding: 12px 14px; }
  .card { padding: 14px; min-height: 120px; }
}

/* ユーティリティ */
.hidden { display: none !important; }
.center { text-align: center; }