.start-section {
  text-align: center;
  margin: 2rem 0;
}

.start-button {
  display: inline-block;
  background: linear-gradient(135deg, #4a90e2, #5ad1ff);
  color: white;
  font-size: 1.5rem;
  font-weight: bold;
  padding: 1rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
  transition: transform 0.2s, background 0.3s;
}

.start-button:hover {
  background: linear-gradient(135deg, #5ad1ff, #4a90e2);
  transform: scale(1.05);
}

.divider {
  border: none;
  border-top: 2px solid #ccc;
  margin: 2rem auto;
  width: 80%;
}

/* ベーシックリセット */
* { box-sizing: border-box; margin: 0; padding: 0; }
html,body { height: 100%; font-family: system-ui, -apple-system, "Yu Gothic UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif; color: #222; background: #f6f8fb; }

/* ユーティリティ */
.container { max-width: 980px; margin: 36px auto; padding: 20px; }
.header { margin-bottom: 18px; }
h1 { font-size: 2rem; margin-bottom: 6px; }
.lead { color: #555; margin-bottom: 12px; }

/* 検索周り */
.controls { display:flex; gap:8px; align-items:center; margin-bottom: 18px; }
#search { flex:1; padding:10px 12px; border-radius:8px; border:1px solid #d7dbe7; background: #fff; font-size:14px; }
#search:focus { outline: 3px solid rgba(60,120,255,0.12); border-color:#3c78ff; }
#clearBtn { padding:8px 12px; border-radius:8px; border:1px solid #d7dbe7; background:#fff; cursor:pointer; }

/* グリッド */
.grid { display:grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap:14px; list-style:none; }

/* カード */
.card { background: transparent; }
.card-link {
  display:flex; align-items:center; gap:12px; text-decoration:none; padding:14px; border-radius:12px;
  background: linear-gradient(180deg, #fff, #fbfdff);
  border: 1px solid rgba(18,24,40,0.06);
  box-shadow: 0 4px 12px rgba(18,24,40,0.04);
  transition: transform .12s ease, box-shadow .12s ease;
  color: inherit;
}
.card-link:focus, .card-link:hover { transform: translateY(-4px); box-shadow: 0 10px 24px rgba(18,24,40,0.08); outline: none; }
.card-thumb {
  width:56px; height:56px; border-radius:10px; display:flex; align-items:center; justify-content:center; font-weight:700; font-size:1.1rem;
  background: linear-gradient(135deg,#eaf2ff,#f2f9ff); color:#073b8c; border:1px solid rgba(7,59,140,0.06);
  flex-shrink:0;
}
.card-body { flex:1; min-width:0; }
.card-title { font-size:1.05rem; margin-bottom:6px; }
.card-desc { color:#666; font-size:0.92rem; line-height:1.3; }

/* 矢印 */
.card-arrow { font-size:22px; color:#b9c6d9; margin-left:8px; }

/* フッター */
.footer { margin-top:20px; color:#777; font-size:0.9rem; text-align:center; }

/* 見えないけどスクリーンリーダー向け */
.visually-hidden {
  position:absolute !important; height:1px; width:1px; overflow:hidden; clip:rect(1px,1px,1px,1px); white-space:nowrap;
}

/* 検索で非表示にするクラス */
.hidden-by-filter { display:none !important; }

/* レスポンシブ微調整 */
@media (max-width:420px){
  .card-link { padding:12px; gap:10px; }
  .card-thumb { width:48px; height:48px; font-size:1rem; }
}

.feedback-section {
  margin-top: 4rem; /* 目次との間に余白 */
  padding: 2rem;
  background: #f9fafb;
  border: 2px solid #d1d5db;
  border-radius: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.feedback-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: #333;
}

.feedback-section p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.feedback-btn {
  display: inline-block;
  background: linear-gradient(135deg, #4f46e5, #6366f1);
  color: #fff;
  font-weight: bold;
  padding: 0.8rem 2rem;
  border-radius: 9999px;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feedback-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(79,70,229,0.3);
}