:root { --yellow:#FFD600; --black:#0b0b0b; --text:#111; --muted:#333; --line:rgba(0,0,0,.12); }
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--yellow);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"Noto Sans JP","Hiragino Kaku Gothic ProN",YuGothic,Meiryo,sans-serif}
a{color:var(--text);text-decoration:none}
.header{position:sticky;top:0;background:var(--yellow);border-bottom:1px solid var(--line);z-index:10}
.header-inner{max-width:1200px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}
.nav ul{margin:0;padding:0;list-style:none;display:flex;gap:18px;font-weight:700}
.logo img{height:44px;width:auto}
.container{max-width:1200px;margin:0 auto;padding:24px 20px}
.section-title{font-size:clamp(24px,4vw,34px);font-weight:900;margin:10px 0 16px}
.split{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start}
.split.reverse{grid-template-columns:.8fr 1.2fr}
@media (max-width: 980px){ .split, .split.reverse{grid-template-columns:1fr;} }
.video-main{width:100%;aspect-ratio:16/9;background:#fff;border:3px solid var(--black);border-radius:14px;overflow:hidden;box-shadow:4px 4px 0 var(--black)}
.video-main iframe{width:100%;height:100%;border:0;display:block}
.vlist{max-height:520px;overflow:auto;border:3px solid var(--black);border-radius:14px;background:#fff;box-shadow:4px 4px 0 var(--black)}
.vitem{display:grid;grid-template-columns:120px 1fr;gap:10px;padding:10px;border-bottom:1px solid #eee;cursor:pointer;align-items:center}
.vitem:hover{background:#fafafa}
.vitem img{width:120px;height:68px;object-fit:cover;border:1px solid #ddd;border-radius:8px}
.vtitle{font-size:14px;font-weight:700;color:#111;line-height:1.25}
.vdate{font-size:12px;color:#666}
.gallery-main{width:100%;aspect-ratio:4/3;background:#fff;border:3px solid var(--black);border-radius:14px;overflow:hidden;display:flex;align-items:center;justify-content:center;box-shadow:4px 4px 0 var(--black)}
.gallery-main img{max-width:100%;max-height:100%;display:block}
.thumblist .vitem img{height:80px}
.footer{padding:40px 24px;border-top:1px solid var(--line);text-align:center;font-weight:600}