:root{--bg:#0b0c0f;--fg:#eaeaea;--card:#111317;--muted:#9aa5b1}body,html{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,Noto Sans,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji,Inter,system-ui,sans-serif;background:var(--bg);color:var(--fg)}.wrapper{min-height:100vh;display:flex;flex-direction:column}header{padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;border-radius:8px;padding:8px 12px;font-size:14px;font-weight:600;color:var(--bg);background:#7cc6ff;cursor:pointer}.btn:hover{filter:brightness(1.05)}.btn:active{transform:translateY(1px)}header h1{font-size:16px;font-weight:600;margin:0}header .hint{font-size:12px;color:var(--muted)}.frame-wrap{flex:1 1;min-height:650px;display:flex;align-items:center;justify-content:center;padding:12px}.frame-inner{width:100%;max-width:1000px}.frame-inner .btn{margin-bottom:8px}iframe{width:100%;height:650px;border:0;background:#fff;border-radius:10px}.notice,iframe{max-width:1000px}.notice{margin:24px auto;background:var(--card);border-radius:12px;padding:16px 18px;line-height:1.5;font-size:14px}.notice-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px}.notice h3{margin:0 0 6px;font-size:14px;font-weight:700}.notice ol,.notice ul{margin:6px 0 0;padding-left:18px;line-height:1.4}.notice ul{list-style:disc}.notice ol{list-style:decimal}.notice .demo-note{margin-top:18px;text-align:center;color:var(--muted)}.container{max-width:1100px;margin:0 auto}a{color:#7cc6ff;text-decoration:none}a:hover{text-decoration:underline}