:root{
  --bg-void:#0B0B0A;
  --bg-surface:#131211;
  --text-primary:#F2EFE9;
  --text-muted:#A79F91;
  --text-faint:#6E685C;
  --accent-blue:#2E8EFF;
  --accent-blue-dim:#1B4A80;
  --hairline:rgba(242,239,233,0.14);
  --good:#4CD98A;
  --bad:#E0637A;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html,body{
  height:100%;background:var(--bg-void);color:var(--text-primary);
  font-family:'Jost',sans-serif;overscroll-behavior:none;overflow-x:hidden;
}
:lang(ko){ word-break:keep-all; }
body{ overflow-wrap:break-word; }
button{ font-family:inherit;touch-action:manipulation; }

/* ---- top nav ---- */
.topnav{
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 20px;max-width:480px;margin:0 auto;
  padding-top:calc(18px + env(safe-area-inset-top));
}
.brand{ display:flex;align-items:center;gap:10px;text-decoration:none;transition:opacity .25s; }
.brand:hover{ opacity:0.8; }
.brand img{ width:24px;height:24px;flex-shrink:0; }
.brand-text{ display:flex;flex-direction:column;gap:2px; }
.brand-text span{
  font-family:'Jost',sans-serif;font-size:11px;font-weight:500;letter-spacing:0.14em;
  color:var(--text-primary);white-space:nowrap;
}
.brand-app-sub{
  font-size:8.5px !important;letter-spacing:0.16em !important;
  color:var(--accent-blue) !important;font-weight:400 !important;
}
.nav-right{ display:flex;align-items:center;gap:14px; }

.lang-select{ position:relative; }
.lang-current{
  background:none;border:1px solid var(--hairline);border-radius:50%;
  width:30px;height:30px;display:flex;align-items:center;justify-content:center;
  font-size:14px;line-height:1;cursor:pointer;transition:border-color .25s;
}
.lang-current:hover{ border-color:var(--accent-blue); }
.flag-icon{ width:20px;height:15px;object-fit:cover;border-radius:2px;display:block; }
.lang-dropdown button .flag-icon{ flex-shrink:0; }
.lang-dropdown{
  position:absolute;top:calc(100% + 10px);right:0;
  background:var(--bg-surface);border:1px solid var(--hairline);
  min-width:140px;padding:6px;display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .2s, transform .2s, visibility .2s;z-index:250;
}
.lang-dropdown.open{ opacity:1;visibility:visible;transform:translateY(0); }
.lang-dropdown button{
  display:flex;align-items:center;gap:9px;background:none;border:none;cursor:pointer;
  padding:9px 10px;font-family:'Jost',sans-serif;font-size:11.5px;color:var(--text-muted);text-align:left;
  transition:background .2s, color .2s;
}
.lang-dropdown button:hover{ background:var(--bg-void);color:var(--text-primary); }
.lang-dropdown button.active{ color:var(--accent-blue); }

.nav-burger{
  display:flex;align-items:center;justify-content:center;
  background:none;border:none;color:var(--text-primary);
  font-size:17px;cursor:pointer;padding:4px 6px;position:relative;
}
.nav-mobile-panel{
  display:flex;flex-direction:column;gap:22px;
  position:fixed;top:0;right:0;
  width:min(260px, 78vw);height:100vh;height:100dvh;
  background:var(--bg-surface);border-left:1px solid var(--hairline);
  z-index:300;padding:90px 28px 28px;
  transform:translateX(100%);transition:transform .35s ease;pointer-events:none;
}
.nav-mobile-panel.open{ transform:translateX(0); pointer-events:auto; }
.panel-link{
  display:block;background:none;border:none;text-align:left;
  font-family:'Jost',sans-serif;font-size:13px;letter-spacing:0.06em;line-height:1.6;
  color:var(--text-primary);cursor:pointer;text-decoration:none;padding:0;
}
.nav-panel-tools{
  display:flex;flex-direction:column;gap:16px;
  padding-top:20px;margin-top:-4px;
  border-top:1px solid var(--hairline);
}
.nav-panel-tools-label{
  font-family:'Jost',sans-serif;font-size:9.5px;letter-spacing:0.24em;
  color:var(--text-faint);
}
.nav-panel-tools .panel-link{
  font-size:11.5px !important;color:var(--text-muted) !important;
}
.nav-panel-close{
  position:absolute;top:26px;right:26px;background:none;border:none;
  color:var(--text-faint);font-size:15px;cursor:pointer;padding:6px;
}
.nav-panel-close:hover{ color:var(--accent-blue); }

/* ---- app shell ---- */
.app{
  min-height:calc(100vh - 64px);min-height:calc(100dvh - 64px);
  display:flex;flex-direction:column;align-items:center;
  padding:8px 20px calc(92px + env(safe-area-inset-bottom));
  gap:16px;
  max-width:480px;margin:0 auto;
}
.app-subtitle{
  font-size:11.5px;color:var(--text-faint);text-align:center;max-width:280px;line-height:1.6;
  margin-top:4px;
}

/* ---- tabbar / screens ---- */
.tabbar{ display:flex;gap:6px;width:100%;margin-top:4px; }
.tab{
  flex:1;background:none;border:1px solid var(--hairline);color:var(--text-faint);
  padding:11px 0;font-size:10.5px;letter-spacing:0.08em;font-weight:500;
  cursor:pointer;transition:border-color .25s, color .25s, background .25s;
}
.tab.active{ border-color:var(--accent-blue);color:var(--accent-blue);background:rgba(46,142,255,0.06); }
.screen{ display:none;flex:1;flex-direction:column;align-items:center;gap:16px;width:100%; }
.screen.active{ display:flex; }

/* ---- beat hit game ---- */
.game-setup{ display:flex;flex-direction:column;align-items:center;gap:20px;width:100%;padding-top:20px; }
.game-tempo-row{ display:flex;flex-direction:column;align-items:center;gap:10px; }
.game-start-btn{
  background:var(--accent-blue);border:none;color:#04070C;
  padding:15px 34px;font-size:11px;letter-spacing:0.16em;font-weight:500;cursor:pointer;
}
.game-play{ display:flex;flex-direction:column;align-items:center;gap:14px;width:100%; }
.game-hud{ display:flex;gap:22px;align-items:baseline; }
.game-score{ font-family:'Fraunces',serif;font-weight:500;font-size:32px;color:var(--text-primary); }
.game-combo{ font-size:11px;letter-spacing:0.1em;color:var(--accent-blue);min-height:14px; }
.game-canvas-wrap{ position:relative;width:100%; }
#gameCanvas{
  width:100%;aspect-ratio:16/9;
  background:var(--bg-surface);border:1px solid var(--hairline);
  touch-action:none;display:block;
}
.judgement-text{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  font-family:'Fraunces',serif;font-weight:500;font-style:italic;font-size:22px;
  color:var(--text-primary);opacity:0;pointer-events:none;
}
.judgement-text.show{ animation:judgePop .5s ease-out; }
@keyframes judgePop{
  0%{ opacity:0;transform:translate(-50%,-50%) scale(0.7); }
  30%{ opacity:1;transform:translate(-50%,-50%) scale(1.15); }
  100%{ opacity:0;transform:translate(-50%,-60%) scale(1); }
}
.judgement-text.perfect{ color:var(--good); }
.judgement-text.good{ color:var(--accent-blue); }
.judgement-text.miss{ color:var(--bad); }
.game-countdown{
  position:absolute;inset:0;
  display:none;align-items:center;justify-content:center;
  background:rgba(11,11,10,0.55);
  pointer-events:none;
}
.game-countdown.show{ display:flex; }
.game-countdown span{
  font-family:'Fraunces',serif;font-weight:500;font-size:56px;color:var(--accent-blue);
  text-shadow:0 0 24px rgba(46,142,255,0.6);
  animation:countPop .32s ease-out;
}
@keyframes countPop{
  0%{ transform:scale(0.5); opacity:0; }
  60%{ transform:scale(1.15); opacity:1; }
  100%{ transform:scale(1); opacity:1; }
}
.game-caption{ font-size:10.5px;color:var(--text-faint);text-align:center;max-width:280px;line-height:1.6; }

/* ---- shared controls ---- */
.stepper{
  width:36px;height:36px;flex-shrink:0;border-radius:50%;
  border:1px solid var(--hairline);background:none;color:var(--text-primary);
  font-size:19px;cursor:pointer;transition:border-color .25s;
}
.stepper:hover{ border-color:var(--accent-blue); }
.stepper.small{ width:32px;height:32px;font-size:16px; }

.icon-btn{
  width:38px;height:38px;border-radius:50%;flex-shrink:0;
  border:1px solid var(--hairline);background:none;color:var(--text-faint);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:border-color .25s, color .25s;
}
.icon-btn:hover{ border-color:var(--accent-blue);color:var(--accent-blue); }
.icon-btn svg{ width:17px;height:17px; }
.icon-btn.small{ width:32px;height:32px; }
.icon-btn.small svg{ width:14px;height:14px; }

.row-label{ font-size:10px;letter-spacing:0.16em;color:var(--text-faint); }

.chip-group{ display:flex;gap:8px;justify-content:center;flex-wrap:wrap; }
/* speedPresets sits in the last row of the PLAYER tab, at the same vertical
   position as the fixed install FAB in the bottom-right corner — centering
   it across the full width put its last chip (100%) right against the FAB,
   overlapping by ~1px on this viewport and likely worse on narrower ones.
   Padding the right side shifts the centering axis left, clearing the FAB's
   footprint without touching any other chip-group on the page. */
#speedPresets{ padding-right:56px; }
.chip{
  min-width:38px;padding:9px 11px;border:1px solid var(--hairline);background:none;
  color:var(--text-faint);font-size:12.5px;letter-spacing:0.03em;cursor:pointer;
  transition:border-color .2s, color .2s;display:flex;align-items:center;justify-content:center;
}
.chip.selected{ border-color:var(--accent-blue);color:var(--accent-blue); }

.bpm-slider-wrap{ display:flex;align-items:center;gap:14px;width:100%; }
input[type="range"]{ flex:1;-webkit-appearance:none;height:2px;background:var(--hairline);outline:none; }
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:var(--accent-blue);cursor:pointer;box-shadow:0 0 8px rgba(46,142,255,0.5);
}
input[type="range"]::-moz-range-thumb{
  width:18px;height:18px;border-radius:50%;border:none;background:var(--accent-blue);cursor:pointer;
}

.tap-tempo{
  background:none;border:1px solid var(--hairline);color:var(--text-muted);
  padding:11px 22px;font-size:10.5px;letter-spacing:0.14em;cursor:pointer;
  transition:border-color .25s, color .25s;touch-action:manipulation;-webkit-user-select:none;user-select:none;
}
.tap-tempo:active{ border-color:var(--accent-blue);color:var(--accent-blue); }

.play-btn{
  width:70px;height:70px;border-radius:50%;background:var(--accent-blue);border:none;color:#04070C;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  box-shadow:0 8px 30px rgba(46,142,255,0.3);transition:transform .15s;flex-shrink:0;
}
.play-btn:active{ transform:scale(0.94); }
.play-btn svg{ width:26px;height:26px; }
.play-btn.playing{ background:var(--text-primary); }

/* ---- MR player ---- */
.player-drop{
  width:100%;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;
  border:1.5px dashed var(--hairline);
  cursor:pointer;transition:border-color .25s, background .25s;
  padding:56px 24px;margin-top:20px;
}
.player-drop.dragover{ border-color:var(--accent-blue);background:rgba(46,142,255,0.05); }
.player-drop svg{ width:34px;height:34px;color:var(--text-faint); }
.player-drop-text{ font-size:13px;color:var(--text-muted);text-align:center;max-width:240px;line-height:1.7; }

.player-main{ display:flex;flex-direction:column;align-items:center;gap:16px;width:100%; }
.player-main.is-empty .player-transport,
.player-main.is-empty .player-control-block,
.player-main.is-empty .tempo-detect-block,
.player-main.is-empty .marker-block{
  opacity:0.38;pointer-events:none;
}
.player-main.is-empty .waveform-wrap{ pointer-events:none; }
.player-main.is-empty .top-row-actions{ display:none; }
.player-main.is-empty .loop-buttons-row{ opacity:0.38;pointer-events:none; }
.player-main.is-empty .player-filename{ visibility:hidden; }
.waveform-placeholder{
  position:absolute;inset:0;display:none;
  align-items:center;justify-content:center;
  font-size:11px;color:var(--text-faint);letter-spacing:0.04em;
  pointer-events:none;text-align:center;padding:0 20px;
}
.player-main.is-empty .waveform-placeholder{ display:flex; }
.player-top-row{ width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px; }
.top-row-actions{ display:flex;align-items:center;gap:8px;flex-shrink:0; }
.player-filename{
  font-size:11.5px;color:var(--text-muted);letter-spacing:0.02em;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;
}

.waveform-wrap{
  position:relative;width:100%;height:110px;
  background:var(--bg-surface);border:1px solid var(--hairline);
  touch-action:none;overflow:hidden;
}
#waveformCanvas{ width:100%;height:100%;display:block; }
.loop-region{
  position:absolute;top:0;bottom:0;
  background:rgba(46,142,255,0.16);
  border-left:1px solid var(--accent-blue);border-right:1px solid var(--accent-blue);
  pointer-events:none;
}
.playhead{
  position:absolute;top:0;bottom:0;left:0;width:1px;background:var(--text-primary);
  pointer-events:none;box-shadow:0 0 6px rgba(242,239,233,0.6);
  will-change:transform;
}
.remove-file-btn{
  position:absolute;top:8px;right:8px;
  width:24px;height:24px;border-radius:50%;
  background:rgba(11,11,10,0.72);backdrop-filter:blur(3px);
  border:1px solid rgba(242,239,233,0.18);color:var(--text-faint);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:border-color .2s, color .2s, background .2s;
}
.remove-file-btn svg{ width:11px;height:11px; }
.remove-file-btn:hover{ border-color:var(--bad);color:var(--bad);background:rgba(11,11,10,0.9); }
.player-main.is-empty .remove-file-btn{ display:none; }
.loop-buttons-row{ display:flex;gap:8px;width:100%;justify-content:center; }
.player-hint{ font-size:10px;color:var(--text-faint);text-align:center;line-height:1.6;max-width:280px; }

.player-transport{ display:flex;align-items:center;gap:22px; }
.player-transport .stepper{ font-size:14px;letter-spacing:-0.05em; }

.player-control-block{ width:100%; }
.control-row{ display:flex;align-items:center;justify-content:space-between;margin-bottom:10px; }
.control-value{
  font-family:'Fraunces',serif;font-weight:500;font-style:italic;font-size:15px;color:var(--accent-blue);
}
.control-number{
  width:52px;text-align:right;
  font-family:'Fraunces',serif;font-weight:500;font-style:italic;font-size:15px;color:var(--accent-blue);
  background:none;border:none;outline:none;-moz-appearance:textfield;
}
.control-number::-webkit-outer-spin-button,
.control-number::-webkit-inner-spin-button{ -webkit-appearance:none;margin:0; }

.tempo-detect-block{ display:flex;flex-direction:column;align-items:center;gap:8px; }
.tempo-readout{ font-size:11px;color:var(--text-faint);letter-spacing:0.04em;min-height:14px; }
.tempo-readout strong{ color:var(--text-primary);font-weight:500; }

.marker-block{ width:100%; }
.add-marker-btn{
  width:24px;height:24px;border-radius:50%;
  background:var(--accent-blue);border:none;color:#04070C;
  font-size:15px;line-height:1;cursor:pointer;
}
.marker-list{ display:flex;gap:8px;flex-wrap:wrap; }
.marker-chip{
  display:flex;align-items:center;gap:6px;
  border:1px solid var(--hairline);padding:7px 10px;
  font-family:'Jost',sans-serif;font-size:11px;color:var(--text-muted);
  cursor:pointer;background:none;
}
.marker-chip:hover{ border-color:var(--accent-blue);color:var(--accent-blue); }
.marker-chip .marker-remove{ color:var(--text-faint);font-size:12px;padding:0 0 0 4px; }
.marker-chip .marker-remove:hover{ color:var(--bad); }
.marker-empty{ font-size:11px;color:var(--text-faint); }

/* ---- floating install button ---- */
.fab-install{
  position:fixed;right:calc(28px + env(safe-area-inset-right));bottom:calc(20px + env(safe-area-inset-bottom));
  width:52px;height:52px;border-radius:50%;background:var(--accent-blue);border:none;color:#04070C;
  display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:200;
  box-shadow:0 8px 24px rgba(46,142,255,0.4);transition:transform .15s;
}
.fab-install:active{ transform:scale(0.92); }
.fab-install svg{ width:22px;height:22px; }
.fab-install.hidden{ display:none; }

/* ---- guide / usage modals ---- */
.modal-overlay{
  position:fixed;inset:0;z-index:500;background:rgba(6,6,6,0.92);
  display:none;align-items:center;justify-content:center;padding:24px;
}
.modal-overlay.open{ display:flex; }
.modal-card{
  position:relative;background:var(--bg-surface);border:1px solid var(--hairline);
  max-width:380px;width:100%;max-height:84vh;overflow-y:auto;padding:36px 26px 28px;
}
.modal-close{
  position:absolute;top:16px;right:16px;background:none;border:none;color:var(--text-faint);
  font-size:14px;cursor:pointer;padding:6px;
}
.modal-close:hover{ color:var(--accent-blue); }
.modal-eyebrow{ font-size:10px;letter-spacing:0.2em;color:var(--accent-blue);margin-bottom:10px; }
.modal-title{ font-family:'Fraunces',serif;font-weight:500;font-size:22px;margin-bottom:12px; }
.modal-desc{ font-size:13px;color:var(--text-muted);line-height:1.8;margin-bottom:22px; }
.guide-block{ margin-bottom:22px; }
.guide-block h3{ font-size:12.5px;letter-spacing:0.04em;color:var(--text-primary);margin-bottom:10px; }
.guide-block h4{
  font-family:'Fraunces',serif;font-style:italic;font-weight:500;font-size:13px;
  color:var(--accent-blue);margin:16px 0 8px;
  display:flex;align-items:center;gap:9px;
}
.guide-icon{ width:20px;height:20px;flex-shrink:0;color:var(--accent-blue); }
.guide-block ol{ padding-left:18px;display:flex;flex-direction:column;gap:8px; }
.guide-block li{ font-size:13px;color:var(--text-muted);line-height:1.7; }
.guide-block strong{ color:var(--text-primary);font-weight:500; }
.guide-sub{ font-size:12.5px;color:var(--text-muted);line-height:1.8; }
.platform-note{
  display:flex;align-items:flex-start;gap:10px;
  border:1px solid var(--accent-blue-dim);background:rgba(46,142,255,0.06);
  padding:12px 14px;margin:10px 0 12px;
}
.platform-note .guide-icon{ margin-top:1px; }
.platform-note p{ font-size:12px;color:var(--text-muted);line-height:1.7;margin:0; }
.modal-note{ font-size:11px;color:var(--text-faint);text-align:center;margin-top:6px;margin-bottom:20px; }
.modal-confirm{
  display:block;width:100%;background:var(--accent-blue);border:none;color:#04070C;
  padding:14px 0;font-size:12px;letter-spacing:0.12em;font-weight:500;cursor:pointer;margin-top:8px;
}

@media (min-width:640px){
  body{
    background:
      radial-gradient(ellipse 900px 600px at 50% -10%, rgba(46,142,255,0.07), transparent 65%),
      var(--bg-void);
  }
  .topnav, .app{
    border-left:1px solid var(--hairline);border-right:1px solid var(--hairline);
    box-shadow:0 0 60px rgba(0,0,0,0.5);
  }
  .fab-install{ right:max(20px, calc(50vw - 240px + 20px)); }
}
@media (min-width:900px){
  .fab-install{ right:max(20px, calc(50vw - 260px + 20px)); }
}

@media (max-width:360px){
  .tab{ font-size:9.5px;letter-spacing:0.05em; }
  .control-value, .control-number{ font-size:13px; }
  .brand-text span{ font-size:9.5px; }
}