:root{--bg:#0b0d12;--panel:#111521;--card:#141a2a;--text:#e9eefc;--muted:#9aa6c3;--line:#24304a;--accent:#7aa2ff}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--line);background:rgba(10,12,18,.72);backdrop-filter:blur(10px);position:sticky;top:0}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--panel);border:1px solid var(--line)}
.title{font-weight:700;letter-spacing:.3px}
.subtitle{color:var(--muted);font-size:12px}
.nav{display:flex;gap:8px}
.tab{border:1px solid var(--line);background:var(--panel);color:var(--text);padding:8px 10px;border-radius:12px;cursor:pointer}
.tab.is-active{border-color:rgba(122,162,255,.7)}
.container{max-width:980px;margin:0 auto;padding:18px}
.panel{display:none}
.panel.is-visible{display:block}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:14px;margin-top:12px;box-shadow:0 10px 30px rgba(0,0,0,.22)}
.row{display:flex;gap:12px;align-items:center;margin-top:10px;flex-wrap:wrap}
button{border:1px solid var(--line);background:var(--panel);color:var(--text);padding:8px 10px;border-radius:12px;cursor:pointer}
.muted{color:var(--muted)}
.hint{color:var(--muted);font-size:12px;margin-top:10px}
canvas{width:100%;height:auto;border-radius:14px;border:1px solid var(--line);background:#0c101a}
code{color:var(--accent)}