:root{
  --bg:#06070a;
  --panel:#0e1015;
  --panel-2:#151820;
  --panel-border:#22252e;
  --ivory:#f2ede2;
  --key-black:#1c1e24;
  --cyan:#4de8ff;
  --cyan-soft:rgba(77,232,255,.35);
  --cyan-dim:#1c5f6e;
  --amber:#d9a441;
  --text:#e9ebef;
  --text-dim:#8890a0;
  --text-faint:#565c68;
  --display:'Fraunces', serif;
  --body:'Inter', sans-serif;
  --mono:'JetBrains Mono', monospace;
  --radius:10px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--body);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
code{font-family:var(--mono);background:var(--panel-2);padding:.1em .4em;border-radius:4px;font-size:.9em;}
button{font-family:inherit;cursor:pointer;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;}

/* ---------- topbar ---------- */
.topbar{
  display:flex;align-items:center;gap:32px;
  padding:18px 32px;
  border-bottom:1px solid var(--panel-border);
  position:sticky;top:0;background:rgba(6,7,10,.86);backdrop-filter:blur(10px);
  z-index:100;
}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:19px;font-weight:500;}
.brand em{font-style:normal;color:var(--cyan);}
.brand-mark{flex:none;}
.mainnav{display:flex;gap:26px;flex:1;font-size:14.5px;}
.mainnav a{color:var(--text-dim);transition:color .15s;}
.mainnav a:hover,.mainnav a.active{color:var(--text);}
.navactions{display:flex;gap:10px;align-items:center;}
.navtoggle{display:none;background:none;border:none;color:var(--text);font-size:20px;}

.btn{
  font-size:14px;font-weight:600;padding:9px 18px;border-radius:8px;border:1px solid transparent;
  display:inline-flex;align-items:center;gap:8px;transition:transform .1s,background .15s,border-color .15s;
}
.btn:active{transform:scale(.97);}
.btn-primary{background:var(--cyan);color:#04222b;}
.btn-primary:hover{background:#69eeff;}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--panel-border);}
.btn-ghost:hover{border-color:var(--text-dim);}
.btn-lg{padding:13px 26px;font-size:15.5px;}
.btn-sm{padding:6px 12px;font-size:13px;}
.btn-icon{width:38px;height:38px;padding:0;justify-content:center;border-radius:50%;background:var(--panel-2);color:var(--text);border:1px solid var(--panel-border);font-size:15px;}
.btn-icon:hover{border-color:var(--cyan);}
.link-btn{background:none;border:none;color:var(--cyan);font-weight:600;font-size:inherit;padding:0;}

/* ---------- routing ---------- */
.view{display:none;}
.view.active{display:block;}

/* ---------- hero ---------- */
.hero{
  display:grid;grid-template-columns:1fr 1fr;gap:56px;
  padding:72px 48px 40px;max-width:1280px;margin:0 auto;align-items:center;
}
.kicker{font-family:var(--mono);font-size:12.5px;color:var(--cyan);margin:0 0 14px;}
.hero-copy h1{
  font-family:var(--display);font-size:clamp(32px,4vw,52px);font-weight:500;line-height:1.08;
  margin:0 0 20px;max-width:14ch;
}
.hero-sub{color:var(--text-dim);font-size:17px;max-width:46ch;margin:0 0 30px;}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.hero-visual{position:relative;}
.hero-visual canvas{width:100%;aspect-ratio:6/5;border-radius:14px;background:#05060a;border:1px solid var(--panel-border);display:block;}
.hero-visual-caption{font-family:var(--mono);font-size:11.5px;color:var(--text-faint);margin:10px 2px 0;}

.strip{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--panel-border);
  margin-top:40px;border-top:1px solid var(--panel-border);
}
.strip-item{background:var(--bg);padding:34px 40px;}
.strip-item h3{font-family:var(--display);font-weight:500;font-size:19px;margin:0 0 10px;}
.strip-item p{color:var(--text-dim);font-size:14.5px;margin:0;max-width:36ch;}

/* ---------- generic page ---------- */
.page-narrow{max-width:720px;margin:0 auto;padding:64px 24px 100px;}
.page-title{font-family:var(--display);font-size:34px;font-weight:500;margin:6px 0 8px;}
.page-sub{color:var(--text-dim);margin:0 0 36px;}

/* ---------- upload ---------- */
.dropzone{
  border:1.5px dashed var(--panel-border);border-radius:16px;padding:56px 30px;text-align:center;
  background:var(--panel);transition:border-color .15s,background .15s;
}
.dropzone:hover,.dropzone:focus-visible{border-color:var(--cyan-dim);}
.dropzone.dragover{border-color:var(--cyan);background:var(--panel-2);}
.dz-title{font-size:17px;font-weight:600;margin:16px 0 4px;}
.dz-sub{color:var(--text-faint);margin:0 0 16px;font-size:13px;}
.dz-filename{font-family:var(--mono);font-size:15px;margin:0 0 4px;word-break:break-all;}
.dz-filesize{color:var(--text-dim);font-size:13px;margin:0 0 18px;}
.progress-track{height:4px;border-radius:4px;background:var(--panel-border);overflow:hidden;margin-bottom:22px;}
.progress-fill{height:100%;background:var(--cyan);width:0%;transition:width .2s;}
.dz-error{color:#ff6b6b;font-size:14px;margin-top:14px;}
.upload-alt{color:var(--text-dim);font-size:14px;margin-top:22px;text-align:center;}
#dropzone-loaded .btn{margin:6px;}

/* ---------- visualizer ---------- */
.viz-shell{display:flex;flex-direction:column;height:calc(100vh - 65px);}
.viz-topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 22px;border-bottom:1px solid var(--panel-border);}
.viz-title strong{font-size:15px;}
.viz-title span{color:var(--text-faint);font-family:var(--mono);font-size:12px;margin-left:10px;}
.viz-topactions{display:flex;gap:8px;}
.camera-presets{display:flex;gap:8px;padding:10px 22px 0;flex-wrap:wrap;}
.camera-presets button{
  background:var(--panel-2);border:1px solid var(--panel-border);color:var(--text-dim);
  padding:6px 14px;border-radius:20px;font-size:12.5px;
}
.camera-presets button.active{background:var(--cyan-dim);color:var(--text);border-color:var(--cyan-dim);}

.viz-stage-wrap{flex:1;display:flex;overflow:hidden;}
.viz-stage{flex:1;position:relative;background:radial-gradient(ellipse at 50% 30%,#0b0d13,#05060a 70%);overflow:hidden;}
.viz-stage-inner{position:absolute;inset:0;transition:transform .35s ease;transform-origin:50% 88%;}
.viz-stage-inner canvas{position:absolute;inset:0;width:100%;height:100%;display:block;}
#hands-canvas{pointer-events:none;}
.finger-labels{position:absolute;inset:0;pointer-events:none;}
.finger-label{
  position:absolute;transform:translate(-50%,-50%);width:16px;height:16px;border-radius:50%;
  background:rgba(6,7,10,.85);border:1px solid var(--cyan);color:var(--cyan);
  font-family:var(--mono);font-size:10px;display:flex;align-items:center;justify-content:center;
}

/* camera presets: coordinated framing of the whole stage (2D keyboard + hands overlay move together) */
.viz-stage-inner.cam-top{transform:scale(1.05) translateY(2%);}
.viz-stage-inner.cam-cinematic{transform:scale(1.12) translateY(-3%);filter:contrast(1.06) saturate(1.08);}
.viz-stage-inner.cam-close{transform:scale(1.55) translateY(6%);}
.viz-stage-inner.cam-full{transform:scale(0.92) translateY(-2%);}

.debug-hud{
  position:absolute;top:12px;left:12px;background:rgba(6,7,10,.82);border:1px solid var(--panel-border);
  border-radius:10px;padding:12px 14px;font-family:var(--mono);font-size:11px;line-height:1.7;color:var(--cyan);
  max-width:260px;white-space:pre-wrap;pointer-events:none;
}
.viz-empty{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  color:var(--text-dim);text-align:center;
}
.viz-sidepanel{
  width:220px;flex:none;border-left:1px solid var(--panel-border);padding:20px 16px;
  display:flex;flex-direction:column;gap:22px;background:var(--panel);overflow-y:auto;
}
.control-group label{display:block;font-size:11.5px;text-transform:none;color:var(--text-faint);margin-bottom:8px;font-family:var(--mono);}
.segmented{display:flex;border:1px solid var(--panel-border);border-radius:8px;overflow:hidden;}
.segmented button{flex:1;background:var(--panel-2);border:none;color:var(--text-dim);padding:7px 4px;font-size:12.5px;}
.segmented button.active{background:var(--cyan-dim);color:var(--text);}
.zoom-row{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12.5px;}
.zoom-row .btn-icon{width:28px;height:28px;font-size:14px;}
#volume-slider{width:100%;accent-color:var(--cyan);}
.notes-status{font-family:var(--mono);font-size:11.5px;color:var(--text-faint);line-height:1.6;}
.panel-divider{height:1px;background:var(--panel-border);margin:2px 0;}
.panel-heading{font-family:var(--mono);font-size:11.5px;color:var(--text-dim);margin:0;display:flex;align-items:center;gap:8px;}
.panel-heading-tag{background:var(--cyan-dim);color:var(--text);font-size:9.5px;padding:2px 6px;border-radius:10px;}
.control-row{display:flex;}
.check-label{display:flex;align-items:center;gap:8px;font-family:var(--body);color:var(--text-dim);font-size:13px;cursor:pointer;}
.check-label input{accent-color:var(--cyan);}
#hand-style-select,#hand-color-select{
  width:100%;background:var(--panel-2);color:var(--text);border:1px solid var(--panel-border);
  border-radius:6px;padding:7px 8px;font-family:var(--body);font-size:13px;
}
#hand-opacity-slider{width:100%;accent-color:var(--cyan);}

.viz-player{
  display:flex;align-items:center;gap:24px;padding:14px 22px;border-top:1px solid var(--panel-border);background:var(--panel);
}
.player-transport{display:flex;gap:8px;}
.btn-play{background:var(--cyan);color:#04222b;border-color:var(--cyan);}
.player-timeline{flex:1;display:flex;align-items:center;gap:12px;}
.time-readout{font-family:var(--mono);font-size:12.5px;color:var(--text-dim);width:52px;}
.time-readout:last-child{text-align:right;}
.timeline-track{flex:1;height:6px;background:var(--panel-border);border-radius:4px;position:relative;cursor:pointer;}
.timeline-fill{position:absolute;left:0;top:0;bottom:0;background:var(--cyan-dim);border-radius:4px;width:0%;}
.timeline-playhead{position:absolute;top:50%;left:0%;width:12px;height:12px;background:var(--cyan);border-radius:50%;transform:translate(-50%,-50%);box-shadow:0 0 10px var(--cyan-soft);}
.player-speed{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12.5px;color:var(--text-dim);}
.player-speed select{background:var(--panel-2);color:var(--text);border:1px solid var(--panel-border);border-radius:6px;padding:5px 8px;font-family:var(--mono);}

/* ---------- projects ---------- */
.projects-empty{color:var(--text-dim);text-align:center;padding:40px 0;}
.projects-empty .btn{margin-top:14px;}
.project-card{
  display:flex;justify-content:space-between;align-items:center;padding:18px 20px;border:1px solid var(--panel-border);
  border-radius:12px;margin-bottom:12px;background:var(--panel);
}
.project-info strong{display:block;font-size:15px;margin-bottom:4px;}
.project-info span{color:var(--text-faint);font-family:var(--mono);font-size:12px;}
.project-actions{display:flex;gap:8px;}

/* ---------- how it works ---------- */
.howsteps{padding-left:20px;color:var(--text-dim);font-size:15px;}
.howsteps li{margin-bottom:12px;}
.howsteps strong{color:var(--text);}
.roadmap-note{color:var(--text-faint);font-size:13.5px;margin-top:28px;border-top:1px solid var(--panel-border);padding-top:20px;}

/* ---------- footer ---------- */
.sitefooter{
  display:flex;justify-content:space-between;padding:22px 32px;color:var(--text-faint);font-size:12.5px;
  border-top:1px solid var(--panel-border);font-family:var(--mono);
}

/* ---------- loading overlay ---------- */
.loading-overlay{
  position:fixed;inset:0;background:rgba(6,7,10,.92);backdrop-filter:blur(4px);
  display:flex;align-items:center;justify-content:center;z-index:1000;
}
.loading-overlay[hidden]{display:none;}
.loading-box{text-align:center;color:var(--text-dim);font-family:var(--mono);font-size:14px;}
.loading-spinner{
  width:34px;height:34px;border-radius:50%;border:2px solid var(--panel-border);border-top-color:var(--cyan);
  margin:0 auto 18px;animation:spin 0.9s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}

/* ---------- source tabs (MIDI vs Audio upload) ---------- */
.source-tabs{display:flex;gap:10px;margin-bottom:28px;}
.source-tab{
  flex:1;text-align:left;background:var(--panel);border:1px solid var(--panel-border);border-radius:12px;
  padding:14px 16px;color:var(--text-dim);
}
.source-tab strong{display:block;color:var(--text);font-size:14.5px;margin-bottom:3px;}
.source-tab span{font-size:12.5px;}
.source-tab.active{border-color:var(--cyan-dim);background:var(--panel-2);}
.source-tab.active strong{color:var(--cyan);}
.source-panel{display:none;}
.source-panel.active{display:block;}
#audio-preview-waveform{width:100%;background:var(--panel-2);border-radius:6px;margin:4px 0 16px;display:block;}

.settings-collapse{
  margin:22px 0;border:1px solid var(--panel-border);border-radius:10px;padding:4px 16px;background:var(--panel);
}
.settings-collapse summary{padding:12px 0;cursor:pointer;font-size:13.5px;color:var(--text-dim);font-family:var(--mono);}
.settings-collapse .control-group{margin:14px 0;}
.settings-collapse input[type="range"]{width:70%;accent-color:var(--cyan);vertical-align:middle;}
.range-val{font-family:var(--mono);color:var(--cyan);font-size:12.5px;margin-left:8px;}
.settings-fixed-note{color:var(--text-faint);font-size:12px;margin:14px 0 8px;line-height:1.6;}

.quality-warning{
  font-size:13px;color:var(--text-dim);background:var(--panel);border:1px solid var(--panel-border);
  border-left:2px solid var(--amber);border-radius:8px;padding:12px 16px;line-height:1.6;margin:18px 0;
}
.non-piano-warning{
  font-size:13px;color:var(--text-dim);background:var(--panel);border:1px solid var(--panel-border);
  border-left:2px solid var(--cyan);border-radius:8px;padding:12px 16px;margin:0 0 18px;
}
.dev-provider-note{font-size:12.5px;color:var(--text-faint);line-height:1.6;margin-top:4px;}

/* ---------- transcription review / piano-roll editor ---------- */
.review-shell{max-width:1180px;margin:0 auto;padding:40px 24px 80px;}
.review-header{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:8px;}
.quality-badge{
  font-family:var(--mono);font-size:12.5px;padding:8px 16px;border-radius:20px;white-space:nowrap;
  background:var(--panel-2);border:1px solid var(--panel-border);color:var(--cyan);
}
.review-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:18px 0 14px;}
.review-toolbar .spacer{flex:1;}
.editor-stage{border:1px solid var(--panel-border);border-radius:12px;overflow:auto;background:var(--panel);max-height:620px;}
#waveform-canvas{display:block;background:#0b0d13;border-bottom:1px solid var(--panel-border);position:sticky;top:0;z-index:2;}
#pianoroll-canvas{display:block;cursor:crosshair;}
.editor-info{
  margin-top:12px;font-family:var(--mono);font-size:12.5px;color:var(--text-dim);
  background:var(--panel);border:1px solid var(--panel-border);border-radius:8px;padding:12px 16px;line-height:1.7;
}

/* ---------- visualizer source badge / original-vs-synth toggle ---------- */
.source-badge{
  font-family:var(--mono);font-size:10.5px;background:var(--cyan-dim);color:var(--text);
  padding:3px 9px;border-radius:10px;margin-left:10px;
}
#audio-source-group{margin-right:8px;}

/* ---------- responsive ---------- */
@media (max-width:880px){
  .mainnav,.navactions{display:none;}
  .mainnav.force-open,.navactions.force-open{
    display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;
    background:var(--bg);border-bottom:1px solid var(--panel-border);padding:16px 24px;gap:14px;z-index:99;
  }
  .navactions.force-open{top:auto;position:static;flex-direction:row;border-bottom:none;padding-top:0;}
  .navtoggle{display:block;}
  .hero{grid-template-columns:1fr;padding:48px 24px;}
  .strip{grid-template-columns:1fr;}
  .viz-sidepanel{position:absolute;right:0;top:0;bottom:0;transform:translateX(100%);transition:transform .2s;box-shadow:-8px 0 24px rgba(0,0,0,.4);}
  .viz-sidepanel.open{transform:translateX(0);}
  .viz-player{flex-wrap:wrap;gap:10px;}
  .player-timeline{order:3;width:100%;}
}