:root{
  --main:#ff5fa2;
  --sub:#5fd1ff;
  --bg:#0f0f1a;
  --card:#1c1c2e;
  --text:#f5f5f7;
}

*{
  box-sizing:border-box;
}

/* ===== 全体 ===== */
body{
  margin:0;
  min-height:100vh;
  font-family:"Segoe UI","Hiragino Kaku Gothic ProN","Meiryo",sans-serif;
  background:
    radial-gradient(circle at top, #1a1a2e, #000);
  color:var(--text);
}

/* ページ中央制御（ここが重要） */
.page-container{
  width:100%;
  max-width:1000px;
  margin:0 auto;
  padding:80px 20px 120px; /* 上を広めにして1〜2個見せる */
}

/* ===== ヘッダー ===== */
header{
  text-align:center;
  margin-bottom:40px;
}

header p{
  max-width:720px;
  margin:0 auto;
  opacity:.85;
  line-height:1.8;
}

/* ===== レイアウト ===== */
.layout{
    display:flex;
    min-height:100vh;
}

/* ===== メイン ===== */
.content{
    flex:1;
    display:flex;
    flex-direction:column;
}

/* ===== サイドバー ===== */
.sidebar{
    width:260px;
    background:#0b0b12;
    border-right:1px solid #222;
    padding:24px 16px;
}

.sidebar-title{
    font-size:1.2rem;
    margin-bottom:16px;
    color:var(--sub);
}

.sidebar-menu{
    list-style:none;
    padding:0;
    margin:0;
}

.sidebar-menu li{
    margin-bottom:10px;
}

.sidebar-menu a{
    display:block;
    padding:12px 14px;
    border-radius:10px;
    text-decoration:none;
    color:var(--text);
    background:rgba(255,255,255,0.03);
    transition:all .25s;
}

.sidebar-menu a:hover{
    background:var(--card);
    transform:translateX(4px);
}
.menu-name{
    display:block;
    font-weight:600;
}

.menu-desc{
    display:block;
    font-size:.75rem;
    color:var(--muted);
}

/* ===== 虹タイトル ===== */
.radio-title{
  font-size:2.6rem;
  margin-bottom:16px;
  background:linear-gradient(
    90deg,
    #ff4ecd,
    #ffb86c,
    #faff00,
    #3cff7a,
    #3fdcff,
    #8b5cf6,
    #ff4ecd
  );
  background-size:400% 400%;
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  animation:rainbowMove 8s ease infinite;
}

@keyframes rainbowMove{
  0%{background-position:0% 50%;}
  50%{background-position:100% 50%;}
  100%{background-position:0% 50%;}
}

/* ===== ラジオ全体ラッパー ===== */
.radio-wrapper{
  background:rgba(255,255,255,0.06);
  backdrop-filter:blur(10px);
  border-radius:24px;
  padding:36px 28px;
  box-shadow:0 20px 60px rgba(0,0,0,.6);
}

/* ===== ラジオ一覧 ===== */
#radioListSection {
  margin-top:30px;
  text-align: center;
}

/* ===== パステルスクロールバー ===== */
#radioList{
  overflow-y:scroll;
  max-height:600px;

  scrollbar-width: thin; /* Firefox */
  scrollbar-color: #ffb3d9 #1c1c2e;
}

/* WebKit系（Chrome / Edge / Safari） */
#radioList::-webkit-scrollbar{
  width:10px;
}

#radioList::-webkit-scrollbar-track{
  background:linear-gradient(
    180deg,
    rgba(255,255,255,0.05),
    rgba(255,255,255,0.02)
  );
  border-radius:999px;
}

#radioList::-webkit-scrollbar-thumb{
  background:linear-gradient(
    180deg,
    #ffb3d9,
    #c7b9ff,
    #aeefff
  );
  border-radius:999px;
  border:2px solid rgba(0,0,0,0.25);
}

#radioList::-webkit-scrollbar-thumb:hover{
  background:linear-gradient(
    180deg,
    #ffc4e4,
    #d6caff,
    #c6f5ff
  );
}
#radioList::-webkit-scrollbar-thumb{
  box-shadow:
    0 0 8px rgba(255,180,220,.6),
    0 0 14px rgba(170,220,255,.4);
}

/* ===== 各ラジオカード ===== */
.radio-item{
  padding:18px 22px;
  border-radius:16px;
  background:linear-gradient(
    135deg,
    rgba(255,255,255,0.18),
    rgba(255,255,255,0.06)
  );
  border:1px solid rgba(255,255,255,.15);
  transition:.3s;
  position:relative;
  overflow:hidden;
}

.radio-item::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(
    120deg,
    transparent,
    rgba(255,255,255,.12),
    transparent
  );
  opacity:0;
  transition:.3s;
}

.radio-item:hover{
  transform:translateY(-5px) scale(1.01);
  box-shadow:0 12px 36px rgba(0,0,0,.55);
}

.radio-item:hover::after{
  opacity:1;
}

/* タイトルリンク */
.radio-item a{
  color:#fff;
  text-decoration:none;
  font-weight:600;
  line-height:1.5;
}

.radio-item a:hover{
  text-decoration:underline;
}

/* 公開状態バッジ */
.radio-status{
  display:inline-block;
  margin-top:8px;
  font-size:.75rem;
  padding:4px 12px;
  border-radius:999px;
  background:linear-gradient(90deg,#ff7ad9,#7afcff);
  color:#000;
  font-weight:bold;
}


/* ===== site-map 全体 ===== */
.site-map{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(260px, 1fr));
  gap:28px;
  max-width:1100px;
  margin:80px auto;
  padding:0 20px;
}

/* ===== カード ===== */
.site-map .card{
  position:relative;
  display:block;
  padding:28px 26px;
  border-radius:20px;
  background:
    linear-gradient(
      135deg,
      rgba(255,255,255,0.18),
      rgba(255,255,255,0.06)
    );
  backdrop-filter:blur(12px);
  border:1px solid rgba(255,255,255,0.15);
  box-shadow:0 18px 50px rgba(0,0,0,.45);
  text-decoration:none;
  color:var(--text);
  overflow:hidden;
  transition:.35s ease;
}

/* 斜めハイライト */
.site-map .card::before{
  content:"";
  position:absolute;
  inset:-40%;
  background:linear-gradient(
    120deg,
    transparent,
    rgba(255,255,255,0.12),
    transparent
  );
  transform:rotate(8deg);
  opacity:0;
  transition:.4s;
}

/* ===== hover ===== */
.site-map .card:hover{
  transform:translateY(-8px) scale(1.02);
  box-shadow:0 28px 70px rgba(0,0,0,.6);
}

.site-map .card:hover::before{
  opacity:1;
}

/* ===== タイトル ===== */
.site-map .card h2{
  margin:0 0 10px;
  font-size:1.25rem;
  background:linear-gradient(
    90deg,
    #ff8ccf,
    #bfa6ff,
    #7de7ff
  );
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}

/* ===== 説明文 ===== */
.site-map .card p{
  margin:0;
  font-size:.95rem;
  line-height:1.7;
  color:#e5e7eb;
  opacity:.9;
}

/* ===== クリック誘導 ===== */
.site-map .card::after{
  content:"→";
  position:absolute;
  right:22px;
  bottom:18px;
  font-size:1.4rem;
  color:rgba(255,255,255,.4);
  transition:.3s;
}

.site-map .card:hover::after{
  color:#fff;
  transform:translateX(4px);
}

/* =========================
   Section common
========================= */

.section-box {
  max-width: 1000px;
  margin: 60px auto;
  padding: 0 20px;
}

.section-box > h2 {
  font-size: 1.8rem;
  margin-bottom: 24px;
  text-align: center;
  position: relative;
}

.section-box > h2::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, #ff5fa2, #5fd1ff);
  margin: 10px auto 0;
  border-radius: 2px;
}

/* ===== モバイル ===== */
@media(max-width:600px){
  .site-map{
    gap:20px;
    margin:60px auto;
  }

  .site-map .card{
    padding:24px 20px;
  }
}


/* ===== フッター ===== */
footer{
  margin-top:80px;
  text-align:center;
  font-size:.85rem;
  color:#94a3b8;
  opacity:.8;
}

/* ===== リンク共通 ===== */
a{
  color:#9ca3af;
  text-decoration:none;
}

a:hover{
  text-decoration:underline;
}

/* ===== モバイル調整 ===== */
@media(max-width:600px){
  .radio-title{
    font-size:2.1rem;
  }

  .radio-wrapper{
    padding:28px 20px;
  }
}

/* ===== レスポンシブ ===== */
@media (max-width:900px){
    .layout{
        flex-direction:column;
    }
    .sidebar{
        width:100%;
        border-right:none;
        border-bottom:1px solid #222;
    }
}