:root{
    --main:#ff5fa2;
    --sub:#5fd1ff;
    --bg:#0f0f1a;
    --card:#1c1c2e;
    --text:#f5f5f7;
}
/* =========================
   Base
========================= */
body {
    font-family: "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
    background: #0e0e15;
    color: #f5f5f5;
    margin: 0;
    padding: 0;
}

a {
    color: #9ca3af;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

/* =========================
   Header
========================= */
header {
    padding: 40px 20px;
    text-align: center;
}
header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}
header p {
    opacity: 0.85;
    line-height: 1.6;
    max-width: 720px;
    margin: 0 auto;
}

/* ===== 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);
}

/* =========================
   Layout
========================= */
section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* =========================
   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;
}

.radio-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card{
    background:#fafaff;
    border-radius:6px;
    padding:20px;
    margin: 10px auto 0;
    color: #000;
    border:1px solid #eee;
    transition:transform .3s, box-shadow .3s;
}
.card a{
    text-decoration:none;
    color: #000;
}   
.card:hover{
    transform:translateY(-6px);
    background: linear-gradient(90deg, #ff5fa2, #5fd1ff);
    box-shadow:0 12px 40px rgba(0,0,0,0.12);
}
/* =========================
   Card
========================= */
.radio-card {
    background: #1a1a2a;
    border-radius: 12px;
    padding: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.radio-card h3 {
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.4;
}

/* iframe 安定表示 */
.radio-card iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: 8px;
    border: none;
}

/* =========================
   Tags
========================= */
.tag {
    display: inline-block;
    font-size: 0.7rem;
    padding: 4px 8px;
    border-radius: 6px;
    width: fit-content;
}

.public {
    background: #2ecc71;
    color: #000;
}

.private {
    background: #f39c12;
    color: #000;
}

button {
    background: linear-gradient(135deg, #ff5fa2, #ff87c2);
    color: #fff;
    border: none;
    padding: 12px 28px;
    font-size: 1rem;
    border-radius: 999px;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(255,95,162,0.3);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(255,95,162,0.4);
}

/* =========================
   Footer
========================= */
footer {
    text-align: center;
    padding: 2rem 1rem;
    font-size: 0.85rem;
    color: #9ca3af;
    border-top: 1px solid #1f2937;
}

/* ===== 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;
    }
}