:root{
  --bg:#060b14;
  --bg2:#0b1322;
  --panel:#0e1728;
  --line:#1c2a42;
  --text:#e8f0fb;
  --muted:#7d8fa9;
  --accent:#00e5a0;
  --accent-dim:rgba(0,229,160,.14);
  --danger:#ff5d6c;
  --radius:12px;
  --shadow:0 10px 30px rgba(0,0,0,.45);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:
    radial-gradient(1100px 500px at 80% -100px, rgba(0,229,160,.07), transparent),
    radial-gradient(700px 400px at -100px 30%, rgba(64,140,255,.06), transparent),
    var(--bg);
  color:var(--text);
  font-family:-apple-system,"Segoe UI",Roboto,Inter,sans-serif;
  line-height:1.6;
  min-height:100vh;
}
a{color:inherit}

/* ---------- Topbar ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(6,11,20,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar__inner{max-width:1200px;margin:auto;padding:.7rem 1.2rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;font-weight:800;letter-spacing:.02em;font-size:1.05rem}
.brand b{color:var(--accent);font-weight:800}
.topbar nav{display:flex;gap:1.3rem}
.topbar nav a{color:var(--muted);text-decoration:none;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;transition:color .18s}
.topbar nav a:hover{color:var(--accent)}

/* ---------- Hero ---------- */
.hero{max-width:1200px;margin:0 auto;padding:3.4rem 1.2rem 1.6rem;text-align:center}
.hero__kicker{font-size:.72rem;letter-spacing:.32em;color:var(--accent);font-weight:700;margin-bottom:1rem}
.hero h1{font-size:clamp(2rem,5.4vw,3.4rem);font-weight:900;letter-spacing:-.02em;line-height:1.08;background:linear-gradient(120deg,#fff 30%,#8ff5d0 75%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__sub{max-width:560px;margin:.9rem auto 0;color:var(--muted);font-size:1.02rem}

/* ---------- Tool layout ---------- */
.tool{max-width:1200px;margin:1.6rem auto;padding:0 1.2rem;display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:1.1rem;align-items:stretch}
.tool__stage-wrap{display:flex;flex-direction:column;gap:.8rem;min-width:0}

.stage{
  position:relative;flex:1;min-height:380px;border-radius:16px;overflow:hidden;
  border:1px solid var(--line);
  background:
    linear-gradient(rgba(0,229,160,.05),rgba(0,229,160,.03)),
    repeating-linear-gradient(0deg,transparent 0 39px,rgba(28,42,66,.55) 39px 40px),
    repeating-linear-gradient(90deg,transparent 0 39px,rgba(28,42,66,.55) 39px 40px),
    var(--bg2);
  box-shadow:var(--shadow), inset 0 0 60px rgba(0,229,160,.04);
  cursor:crosshair;outline:none;user-select:none;
  transition:border-color .2s, box-shadow .2s;
}
.stage:hover,.stage:focus-visible{border-color:rgba(0,229,160,.5);box-shadow:var(--shadow),0 0 0 3px var(--accent-dim)}
.stage.is-down{background:linear-gradient(rgba(0,229,160,.12),rgba(0,229,160,.06)),repeating-linear-gradient(0deg,transparent 0 39px,rgba(28,42,66,.55) 39px 40px),repeating-linear-gradient(90deg,transparent 0 39px,rgba(28,42,66,.55) 39px 40px),var(--bg2)}
.stage__canvas{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.stage__hint{position:absolute;inset:auto 0 50%;transform:translateY(50%);text-align:center;font-size:.78rem;letter-spacing:.3em;color:var(--muted);pointer-events:none;transition:opacity .25s;animation:pulse 2.2s ease-in-out infinite}
.stage__hint.hidden{opacity:0}
@keyframes pulse{50%{color:var(--accent)}}
.stage__coords{position:absolute;top:.7rem;left:.85rem;font-size:.75rem;font-variant-numeric:tabular-nums;letter-spacing:.14em;color:var(--muted);background:rgba(6,11,20,.7);border:1px solid var(--line);padding:.3rem .6rem;border-radius:8px;pointer-events:none}
.dragzone{position:absolute;bottom:.8rem;left:.85rem;right:.85rem;border:1.5px dashed rgba(125,143,169,.5);border-radius:10px;background:rgba(6,11,20,.65);padding:.65rem .9rem;text-align:center;cursor:text;user-select:text}
.dragzone span{font-size:.74rem;letter-spacing:.14em;color:var(--muted);word-break:break-all}
.dragzone.dragging{border-color:var(--accent);background:var(--accent-dim)}

.tool__actions{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap}
.btn{font:inherit;font-weight:700;letter-spacing:.06em;border-radius:10px;border:1px solid var(--line);background:var(--panel);color:var(--text);padding:.68rem 1.15rem;cursor:pointer;transition:all .18s;min-height:44px}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--accent{background:var(--accent);color:#04120c;border-color:var(--accent);text-decoration:none}
.btn--accent:hover{filter:brightness(1.1);transform:translateY(-1px)}
.tool__poll{margin-left:auto;font-size:.72rem;letter-spacing:.2em;font-weight:700;color:var(--accent);background:var(--accent-dim);border:1px solid rgba(0,229,160,.35);padding:.45rem .8rem;border-radius:999px;white-space:nowrap}

/* ---------- Panels ---------- */
.panels{display:grid;grid-template-rows:repeat(4,auto);gap:1.1rem}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.1rem;box-shadow:var(--shadow)}
.panel__title{font-size:.7rem;letter-spacing:.26em;text-transform:uppercase;color:var(--muted);margin-bottom:.7rem;font-weight:700}
.panel__foot{font-size:.82rem;color:var(--muted);margin-top:.7rem}
.panel__foot strong{color:var(--text)}

.btnlist{list-style:none;display:flex;flex-direction:column;gap:.5rem}
.btnlist li{display:grid;grid-template-columns:56px 1fr 34px;align-items:center;gap:.6rem;padding:.35rem .5rem;border-radius:8px;transition:background .15s}
.btnlist li.is-on{background:var(--accent-dim)}
.btnlist__key{font-size:.78rem;font-weight:700;letter-spacing:.06em;color:var(--muted)}
li.is-on .btnlist__key{color:var(--accent)}
.btnlist__bar{height:6px;border-radius:99px;background:#16233a;overflow:hidden}
.btnlist__bar i{display:block;height:100%;width:calc(min(var(--n,0),10)*10%);min-width:0;border-radius:99px;background:linear-gradient(90deg,var(--accent-dim),var(--accent));transition:width .2s}
.btnlist__count{font-variant-numeric:tabular-nums;font-weight:800;text-align:right;font-size:.95rem}

.stat-big{font-size:2.3rem;font-weight:900;line-height:1;color:var(--text);font-variant-numeric:tabular-nums}
.stat-big small{font-size:.8rem;letter-spacing:.2em;color:var(--accent);font-weight:700}
.stat-big.flash{animation:flashA .35s}
@keyframes flashA{0%{color:var(--accent)}}
.mini-stats{display:grid;grid-template-columns:1fr 1fr;gap:.6rem;margin-top:.8rem}
.mini-stats--col{grid-template-columns:1fr;margin-top:.2rem}
.mini-stats div{background:rgba(255,255,255,.03);border:1px solid var(--line);border-radius:8px;padding:.5rem .7rem}
.mini-stats dt{font-size:.62rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.mini-stats dd{font-weight:800;font-variant-numeric:tabular-nums;font-size:1.02rem}

.wheel{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:.5rem;text-align:center}
.wheel__dir{font-weight:900;font-size:1.15rem;color:var(--muted);padding:.45rem .3rem;border-radius:8px;transition:all .15s}
.wheel__up.flash{color:var(--accent);background:var(--accent-dim)}
.wheel__down.flash{color:#ffb86b;background:rgba(255,184,107,.14)}
.wheel__ticks{font-size:.72rem;letter-spacing:.12em;color:var(--muted);white-space:nowrap}

/* ---------- Content sections ---------- */
.content{max-width:840px;margin:0 auto;padding:2.6rem 1.2rem}
.content h2{font-size:1.55rem;letter-spacing:-.01em;margin-bottom:.9rem;font-weight:850}
.content p{color:var(--muted)}
.steps{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin-top:1.2rem}
.steps li{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem;transition:transform .2s,border-color .2s}
.steps li:hover{transform:translateY(-3px);border-color:rgba(0,229,160,.45)}
.steps h3{font-size:.95rem;margin-bottom:.4rem;color:var(--accent);letter-spacing:.04em}
.steps p{font-size:.88rem}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1rem}
.grid2 article{border-left:2px solid var(--accent);padding-left:1rem}
.grid2 h3{font-size:.98rem;margin-bottom:.35rem}
.grid2 p{font-size:.88rem}
details{border:1px solid var(--line);border-radius:10px;background:var(--panel);margin-bottom:.6rem;overflow:hidden}
summary{cursor:pointer;padding:.9rem 1.1rem;font-weight:700;font-size:.95rem;list-style:none;display:flex;justify-content:space-between;align-items:center}
summary::after{content:"+";color:var(--accent);font-size:1.2rem;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{padding:0 1.1rem .95rem;font-size:.9rem}
.cta{text-align:center;padding:2.6rem 1.2rem 3rem}
.cta h2{font-size:1.5rem;margin-bottom:.5rem}
.cta p{color:var(--muted);max-width:480px;margin:0 auto 1.3rem}

.footer{border-top:1px solid var(--line);padding:1.6rem 1.2rem 2.2rem;text-align:center;color:var(--muted);font-size:.85rem}
.footer nav{margin-bottom:.5rem}
.footer a{color:var(--muted);text-decoration:none}
.footer a:hover{color:var(--accent)}

.toast{position:fixed;left:50%;bottom:-70px;transform:translateX(-50%);background:var(--panel);border:1px solid var(--accent);color:var(--text);padding:.7rem 1.3rem;border-radius:10px;font-size:.88rem;font-weight:600;box-shadow:var(--shadow);transition:bottom .3s;z-index:100}
.toast.show{bottom:26px}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .tool{grid-template-columns:1fr}
  .panels{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-template-rows:none}
  .stage{min-height:300px}
  .topbar nav{display:none}
}
@media(max-width:520px){
  .hero{padding-top:2.4rem}
  .stage{min-height:250px}
  .dragzone span{font-size:.62rem}
  .tool__poll{margin-left:0;width:100%;text-align:center}
  .grid2{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}