:root{
  --bg:#0c0c10;
  --bg2:#141420;
  --panel:#1a1a26;
  --panel2:#222232;
  --ink:#f2f2f7;
  --muted:#8a8aa0;
  --accent:#ff5e3a;      /* hot MPC orange */
  --accent2:#ffb000;     /* amber */
  --kick:#ff5e3a;
  --snare:#36d1ff;
  --hat:#b86bff;
  --green:#33e07a;
  --amber:#ffb000;
  --red:#ff4d6d;
  --pad:#26263a;
  --pad-edge:#34344e;
  --radius:14px;
  --shadow:0 6px 22px rgba(0,0,0,.45);
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(1200px 600px at 50% -10%, #1c1c2c 0%, var(--bg) 60%),
    var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  min-height:100vh;
  display:flex;flex-direction:column;
  overflow-x:hidden;
  user-select:none;
}

/* ===== Top bar ===== */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 18px;
  border-bottom:1px solid #1f1f2e;
  position:sticky;top:0;z-index:5;
  background:linear-gradient(180deg, rgba(12,12,16,.95), rgba(12,12,16,.7));
  backdrop-filter:blur(8px);
}
.brand{display:flex;align-items:center;gap:9px;margin:0;font-size:18px;font-weight:900}
.logo{font-size:26px;filter:drop-shadow(0 0 6px rgba(255,94,58,.4))}
.brand-name{font-weight:900;letter-spacing:3px;font-size:18px}
.top-stats{display:flex;align-items:center;gap:14px}
.stat{display:flex;flex-direction:column;align-items:center;line-height:1.05}
.stat-num{font-weight:800;font-size:15px}
.stat-lbl{font-size:9px;letter-spacing:1px;color:var(--muted);text-transform:uppercase}
.icon-btn{
  width:30px;height:30px;border-radius:50%;
  background:var(--panel2);border:1px solid var(--pad-edge);
  color:var(--ink);font-weight:800;cursor:pointer;font-size:14px;
}
.icon-btn:active{transform:scale(.92)}

/* ===== Stage ===== */
.stage{
  flex:1;width:100%;max-width:600px;margin:0 auto;
  padding:18px 16px 28px;
  display:flex;flex-direction:column;align-items:center;gap:18px;
}
.groove-line{
  text-align:center;color:var(--muted);font-size:14px;
  min-height:20px;transition:color .25s, transform .25s;
}
.groove-line.win{color:var(--green);font-weight:700}
.groove-line.flam{color:var(--red)}
.groove-line.tight{color:var(--accent2)}

/* ===== Transport ===== */
.transport{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:center}
.btn{
  border:none;border-radius:12px;cursor:pointer;
  font-weight:700;color:var(--ink);
  background:var(--panel2);
  padding:12px 18px;font-size:15px;
  transition:transform .08s, filter .15s, background .15s;
  display:inline-flex;align-items:center;gap:8px;
  border:1px solid var(--pad-edge);
}
.btn:active{transform:scale(.95)}
.btn.primary{background:linear-gradient(180deg,var(--accent),#e0431f);border-color:#ff7a5c;box-shadow:0 4px 14px rgba(255,94,58,.35)}
.btn.primary:disabled{opacity:.45;box-shadow:none;cursor:not-allowed}
.btn.secondary{background:var(--panel2)}
.btn.ghost{background:transparent;border-color:#2c2c40;color:var(--muted)}
.btn.small{padding:9px 14px;font-size:13px}
.btn.big{padding:14px 40px;font-size:18px;letter-spacing:1px}
.btn.play{
  background:linear-gradient(180deg,#2a2a40,#1b1b2a);
  border:1px solid var(--pad-edge);padding:12px 22px;font-size:16px;
}
.btn.play.playing{background:linear-gradient(180deg,var(--accent),#e0431f);border-color:#ff7a5c}
.play-icon{font-size:14px}

/* ===== Tightness meter ===== */
.tightness-wrap{width:100%;max-width:420px;opacity:0;transition:opacity .3s;height:34px}
.tightness-wrap.show{opacity:1}
.tightness-label{display:flex;justify-content:space-between;font-size:10px;letter-spacing:1px;color:var(--muted);text-transform:uppercase;margin-bottom:5px}
.tightness-label #tightPct{color:var(--ink);font-weight:800}
.tightness-bar{height:9px;border-radius:6px;background:#1e1e2e;overflow:hidden;border:1px solid #2a2a3e}
.tightness-fill{height:100%;width:0%;border-radius:6px;
  background:linear-gradient(90deg,var(--red),var(--amber),var(--green));
  transition:width .5s cubic-bezier(.2,.8,.2,1)}

/* ===== Board ===== */
.board{
  width:100%;display:flex;flex-direction:column;gap:12px;
  background:var(--panel);border:1px solid #23233a;border-radius:var(--radius);
  padding:14px 12px;box-shadow:var(--shadow);
}
.row{display:flex;align-items:center;gap:8px}
.row-label{
  width:42px;flex:0 0 42px;text-align:right;font-size:10px;font-weight:800;
  letter-spacing:.5px;text-transform:uppercase;color:var(--muted);
}
.row.kick .row-label{color:var(--kick)}
.row.snare .row-label{color:var(--snare)}
.row.hat .row-label{color:var(--hat)}
.pads{display:grid;grid-template-columns:repeat(16,1fr);gap:4px;flex:1}

.pad{
  aspect-ratio:1/1;border-radius:8px;
  background:linear-gradient(180deg,var(--pad),#1c1c2c);
  border:1px solid var(--pad-edge);
  cursor:pointer;position:relative;
  transition:transform .06s, background .1s, box-shadow .1s;
  min-width:0;
}
/* beat group shading (every 4) */
.pads .pad:nth-child(4n+1){border-left:2px solid #3a3a55}
.pad:active{transform:scale(.9)}
.pad.on{box-shadow:inset 0 0 0 2px rgba(255,255,255,.15)}
.row.kick .pad.on{background:linear-gradient(180deg,#ff7a5c,#e0431f);box-shadow:0 0 10px rgba(255,94,58,.5),inset 0 1px 0 rgba(255,255,255,.3)}
.row.snare .pad.on{background:linear-gradient(180deg,#5adcff,#1aa6e0);box-shadow:0 0 10px rgba(54,209,255,.5),inset 0 1px 0 rgba(255,255,255,.3)}
.row.hat .pad.on{background:linear-gradient(180deg,#c98bff,#9a4fe0);box-shadow:0 0 10px rgba(184,107,255,.5),inset 0 1px 0 rgba(255,255,255,.3)}

/* playhead */
.pad.playhead{outline:2px solid rgba(255,255,255,.55);outline-offset:-1px}
.pad.flash{animation:flash .18s ease}
@keyframes flash{0%{transform:scale(1.18);filter:brightness(1.6)}100%{transform:scale(1)}}

/* guess feedback overlay colors (small corner dot) */
.pad .mark{position:absolute;right:2px;top:2px;width:6px;height:6px;border-radius:50%;opacity:0;transition:opacity .2s}
.pad.correct .mark{background:var(--green);opacity:1;box-shadow:0 0 6px var(--green)}
.pad.close .mark{background:var(--amber);opacity:1;box-shadow:0 0 6px var(--amber)}
.pad.phantom{box-shadow:inset 0 0 0 2px var(--red)}
.pad.phantom .mark{background:var(--red);opacity:1}

/* win pulse */
.board.win{animation:winglow 1.4s ease}
@keyframes winglow{0%,100%{box-shadow:var(--shadow)}50%{box-shadow:0 0 40px rgba(51,224,122,.55)}}
.pad.win-pulse{animation:winpulse .5s ease}
@keyframes winpulse{0%{transform:scale(1)}40%{transform:scale(1.22);filter:brightness(1.5)}100%{transform:scale(1)}}

/* ===== Guess row ===== */
.guess-row{display:flex;flex-direction:column;align-items:center;gap:8px}
.guesses-left{font-size:12px;color:var(--muted);letter-spacing:.5px}
.history{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;min-height:14px}
.hdot{width:11px;height:11px;border-radius:50%;background:#2a2a3e;border:1px solid #36364e}
.hdot.used{background:linear-gradient(180deg,var(--accent),#e0431f)}
.hdot.solved{background:var(--green);box-shadow:0 0 6px var(--green)}

/* ===== Overlays ===== */
.overlay{
  position:fixed;inset:0;z-index:50;
  background:rgba(6,6,10,.82);backdrop-filter:blur(6px);
  display:flex;align-items:center;justify-content:center;padding:18px;
  animation:fade .25s ease;
}
.overlay.hidden{display:none}
@keyframes fade{from{opacity:0}to{opacity:1}}
.overlay-card{
  background:linear-gradient(180deg,var(--panel2),var(--panel));
  border:1px solid #2e2e44;border-radius:20px;
  padding:26px 22px;max-width:440px;width:100%;text-align:center;
  box-shadow:0 20px 60px rgba(0,0,0,.6);
  max-height:92vh;overflow-y:auto;
}
.overlay-card h2{margin:6px 0 10px;font-size:23px}
.overlay-card p{color:#c8c8d8;font-size:15px;line-height:1.5;margin:8px 0}
.tut-emoji,.result-emoji{font-size:44px}
.tut-sub{color:var(--muted)!important;font-size:13px!important}
.tut-hint{margin-top:12px;font-size:13px;color:var(--accent2);min-height:18px}
.tut-grid{display:grid;grid-template-columns:repeat(16,1fr);gap:4px;margin:16px 0}
.tut-grid .pad{aspect-ratio:1/1}
.tut-next,.tut-skip,.tut-done{margin-top:14px}
.tut-skip{display:block;margin:10px auto 0}

/* ===== Result ===== */
.result-card .result-sub{color:var(--muted);margin-top:0}
.clip-canvas{
  width:100%;max-width:380px;height:auto;aspect-ratio:540/300;
  border-radius:14px;margin:14px auto;display:block;
  background:#0a0a10;border:1px solid #2a2a3e;
}
.result-tab{
  font-size:20px;letter-spacing:2px;margin:6px 0 14px;line-height:1.7;
  word-break:break-all;
}
.result-actions{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:6px}
.share-note{font-size:12px;color:var(--muted);margin-top:12px;min-height:16px}
.countdown{margin-top:18px;font-size:14px;color:var(--accent2);font-weight:700;letter-spacing:1px}
.studio-pass{
  margin-top:18px;padding:12px;border-radius:12px;
  background:#15151f;border:1px dashed #33334a;
  font-size:12px;color:var(--muted);display:flex;align-items:center;gap:10px;text-align:left;
}
.sp-badge{background:var(--accent2);color:#1a1206;font-weight:900;font-size:10px;padding:3px 7px;border-radius:6px;letter-spacing:1px}

/* ===== Footer ===== */
.footer{
  text-align:center;padding:20px 16px 28px;color:var(--muted);font-size:12px;
  border-top:1px solid #18182a;line-height:1.6;
}
.footer-sub{margin-top:4px;font-size:11px}
.footer a{color:var(--muted)}

.hidden{display:none!important}

/* ===== Responsive ===== */
@media (max-width:480px){
  .pads{gap:3px}
  .row-label{width:34px;flex:0 0 34px;font-size:9px}
  .pad{border-radius:6px}
  .brand-name{font-size:15px;letter-spacing:2px}
  .btn{padding:11px 14px;font-size:14px}
  .btn.big{padding:13px 30px}
  .stage{gap:14px;padding:14px 10px 24px}
}
@media (min-width:520px){
  .pad{border-radius:9px}
}