/* vars */
:root {
  --bg-base: #0a0a0f;
  --bg-surface: #111118;
  --bg-elevated: #18181f;
  --bg-hover: #1e1e28;
  --border: #2a2a38;
  --border-subtle: #1e1e28;
  --text-primary: #eeeef2;
  --text-secondary: #8888a0;
  --text-muted: #4a4a60;
  --accent: #7c6af5;
  --accent-glow: rgba(124,106,245,.22);
  --accent-hover: #9585f8;
  --accent-done: #2ecc8f;
  --accent-done-glow: rgba(46,204,143,.18);
  --danger: #f56060;
  --keep-color: #2ecc8f;
  --erase-color: #f56060;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --nav-h: 52px;
  --mode-h: 48px;
  --footer-h: 64px;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{height:100%;overflow-x:hidden}
body{min-height:100%;background:var(--bg-base);color:var(--text-primary);font-family:var(--font);font-size:14px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
button{cursor:pointer;border:none;background:none;font-family:inherit;font-size:inherit}
input{font-family:inherit}
.hidden{display:none!important}

/* nav */
#nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;
  padding:0 1rem;background:rgba(10,10,15,.9);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-subtle);
}
.nav-brand{display:flex;align-items:center;gap:.4rem}
.brand-icon{color:var(--accent);font-size:1rem}
.brand-name{font-size:.95rem;font-weight:600;letter-spacing:-.01em}
.brand-name em{font-style:normal;color:var(--accent)}
.queue-indicator{display:flex;align-items:center;gap:.35rem;font-size:.75rem;color:var(--text-secondary)}
.queue-dot{width:6px;height:6px;border-radius:50%;background:var(--text-muted);transition:background .3s}
.queue-indicator.active .queue-dot{background:var(--accent);box-shadow:0 0 6px var(--accent)}

/* mode bar */
#modeBar{
  display:flex;position:sticky;top:var(--nav-h);z-index:99;
  background:rgba(10,10,15,.95);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border-subtle);height:var(--mode-h);
}
.mode-btn{
  flex:1;display:flex;align-items:center;justify-content:center;gap:.35rem;
  font-size:.8rem;font-weight:500;color:var(--text-muted);
  border-bottom:2px solid transparent;transition:all .2s var(--ease-out);
}
.mode-btn:hover{color:var(--text-secondary)}
.mode-btn.active{color:var(--accent);border-bottom-color:var(--accent)}

/* canvas zone */
#canvasZone{
  position:relative;width:100%;
  height:calc(100svh - var(--nav-h) - var(--mode-h) - var(--footer-h) - 320px);
  min-height:200px;background:var(--bg-base);overflow:hidden;
}

/* drop area */
.drop-area{
  display:flex;align-items:center;justify-content:center;
  width:100%;height:100%;
}
.drop-area.drag-over .drop-inner{border-color:var(--accent);background:rgba(124,106,245,.06)}
.drop-inner{
  display:flex;flex-direction:column;align-items:center;gap:.6rem;
  border:1.5px dashed var(--border);border-radius:var(--radius-lg);
  padding:2rem 2.5rem;text-align:center;background:var(--bg-surface);
  transition:all .2s var(--ease-out);
}
.drop-icon{font-size:2rem;color:var(--text-muted)}
.drop-title{font-size:.95rem;font-weight:500}
.drop-sub{font-size:.75rem;color:var(--text-muted)}
.drop-btn{
  display:inline-flex;align-items:center;padding:.4rem 1.1rem;
  background:var(--bg-elevated);border:1px solid var(--border);
  border-radius:var(--radius-md);color:var(--text-primary);font-size:.8rem;
  font-weight:500;cursor:pointer;transition:all .15s;margin-top:.2rem;
}
.drop-btn:hover{border-color:var(--accent);background:rgba(124,106,245,.08)}

/* split viewer */
.split-viewer{position:relative;width:100%;height:100%;overflow:hidden}
.split-canvas{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:contain}
#canvasBefore{z-index:1}
#canvasAfter{z-index:2;clip-path:inset(0 50% 0 0)}
.split-slider{
  position:absolute;top:0;bottom:0;left:50%;z-index:10;
  width:2px;background:var(--accent);cursor:ew-resize;
}
.split-handle{
  position:absolute;top:50%;transform:translate(-50%,-50%);
  width:32px;height:32px;border-radius:50%;
  background:var(--accent);display:flex;align-items:center;justify-content:center;
  gap:1px;font-size:.7rem;color:#fff;font-weight:700;
  box-shadow:0 0 0 3px rgba(0,0,0,.4),0 0 16px var(--accent-glow);
}
.split-labels{
  position:absolute;bottom:.75rem;left:0;right:0;display:flex;justify-content:space-between;
  padding:0 .75rem;pointer-events:none;z-index:11;
}
.lbl-before,.lbl-after{
  font-size:.65rem;font-weight:600;padding:.2rem .5rem;border-radius:4px;
  background:rgba(0,0,0,.55);backdrop-filter:blur(8px);color:var(--text-secondary);
}

/* process overlay */
.process-overlay{
  position:absolute;inset:0;z-index:20;
  display:flex!important;flex-direction:column;align-items:center;justify-content:center;
  gap:.85rem;background:rgba(10,10,15,.72);backdrop-filter:blur(12px);
}
.process-overlay.hidden{display:none!important}
.process-ring{position:relative;width:100px;height:100px}
.ring-svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring-track{fill:none;stroke:var(--border);stroke-width:6}
.ring-fill{fill:none;stroke:var(--accent);stroke-width:6;stroke-linecap:round;transition:stroke-dashoffset .3s var(--ease-out)}
.ring-center{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:1.15rem;font-weight:600;font-family:var(--mono)}
#processStatus{font-size:.78rem;color:var(--text-secondary)}
.cancel-btn{font-size:.72rem;color:var(--danger);border:1px solid rgba(245,96,96,.22);padding:.28rem .75rem;border-radius:var(--radius-sm);transition:all .15s}
.cancel-btn:hover{background:rgba(245,96,96,.1)}

/* queue bar */
.queue-bar{
  position:absolute;bottom:0;left:0;right:0;height:72px;z-index:5;
  background:rgba(17,17,24,.92);backdrop-filter:blur(12px);
  border-top:1px solid var(--border-subtle);padding:.4rem .6rem;
  overflow-x:auto;scrollbar-width:none;
}
.queue-thumbs{display:flex;gap:.4rem;align-items:center;height:100%}
.q-thumb{
  position:relative;width:52px;height:52px;flex-shrink:0;
  border-radius:var(--radius-sm);overflow:hidden;border:2px solid var(--border);cursor:pointer;
}
.q-thumb.active{border-color:var(--accent)}
.q-thumb.done{border-color:var(--accent-done)}
.q-thumb img{width:100%;height:100%;object-fit:cover}
.q-thumb .q-status{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:.6rem;font-weight:700;background:rgba(0,0,0,.45)}
.q-thumb.done .q-status{color:var(--accent-done)}
.q-thumb.error .q-status{color:var(--danger)}
.q-thumb.processing .q-status{color:var(--accent)}

/* settings panel */
#settingsPanel{
  background:var(--bg-surface);border-top:1px solid var(--border-subtle);
  padding:.85rem 1rem 1rem;padding-bottom:calc(var(--footer-h) + .5rem);
  overflow-y:auto;
}
.panel{display:flex;flex-direction:column;gap:1rem}
.setting-group{display:flex;flex-direction:column;gap:.45rem}
.setting-label{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted)}

/* chips */
.chip-row{display:flex;flex-wrap:wrap;gap:.35rem}
.chip-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.35rem}
.chip{
  padding:.38rem .7rem;border-radius:20px;font-size:.75rem;font-weight:500;
  border:1px solid var(--border);color:var(--text-secondary);
  background:var(--bg-elevated);transition:all .15s var(--ease-out);
  white-space:nowrap;text-align:center;
}
.chip:hover{border-color:var(--accent);color:var(--text-primary)}
.chip.active{background:rgba(124,106,245,.15);border-color:var(--accent);color:var(--accent)}
.chip.keep.active{background:rgba(46,204,143,.12);border-color:var(--keep-color);color:var(--keep-color)}
.chip.erase.active{background:rgba(245,96,96,.12);border-color:var(--erase-color);color:var(--erase-color)}
.chip.keep{color:var(--keep-color);border-color:rgba(46,204,143,.3)}
.chip.erase{color:var(--erase-color);border-color:rgba(245,96,96,.3)}

/* sub rows */
.sub-row{display:flex;align-items:center;gap:.5rem;margin-top:.25rem;padding:.4rem .5rem;background:var(--bg-elevated);border-radius:var(--radius-sm)}
.sub-row input[type=color]{width:28px;height:28px;border:none;border-radius:4px;cursor:pointer;background:none;padding:0}
.sub-row span{font-family:var(--mono);font-size:.72rem;color:var(--text-secondary)}
.grad-presets{display:flex;gap:.35rem;flex-wrap:wrap}
.grad-swatch{width:30px;height:30px;border-radius:5px;cursor:pointer;border:2px solid transparent;transition:border-color .15s}
.grad-swatch:hover,.grad-swatch.active{border-color:var(--accent)}

/* sliders */
.slider-rows{display:flex;flex-direction:column;gap:.55rem}
.sl-row{display:flex;align-items:center;gap:.5rem}
.sl-lbl{font-size:.7rem;color:var(--text-muted);width:72px;flex-shrink:0}
.sl-val{font-family:var(--mono);font-size:.68rem;color:var(--accent);width:28px;text-align:right;flex-shrink:0}
.slider{flex:1;-webkit-appearance:none;appearance:none;height:3px;border-radius:2px;background:var(--border);outline:none;cursor:pointer}
.slider::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 0 3px var(--accent-glow)}

/* brush wrap */
#brushWrap .chip-row{margin-bottom:.35rem}

/* upscale */
.size-row-wrap{display:flex;align-items:center;gap:.4rem}
.size-field{display:flex;align-items:center;gap:.3rem;flex:1}
.size-lbl{font-size:.68rem;color:var(--text-muted);flex-shrink:0}
.size-input{width:100%;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);padding:.3rem .4rem;color:var(--text-primary);font-size:.78rem;font-family:var(--mono);outline:none}
.size-input:focus{border-color:var(--accent)}
.size-input::placeholder{color:var(--text-muted)}
.size-sep{color:var(--text-muted);font-size:.8rem;flex-shrink:0}
.lock-wrap{display:flex;align-items:center;gap:.3rem;font-size:.72rem;color:var(--text-secondary);cursor:pointer;flex-shrink:0}
.lock-wrap input{accent-color:var(--accent)}
.upscale-info{display:flex;align-items:center;gap:.5rem;padding:.5rem .6rem;background:var(--bg-elevated);border:1px solid var(--border-subtle);border-radius:var(--radius-sm)}
.upscale-info span{font-family:var(--mono);font-size:.72rem;color:var(--text-secondary)}
#infoNew{color:var(--accent)}
.info-arrow{color:var(--text-muted)!important}

/* enhancer reset */
.reset-btn{width:100%;margin-top:.5rem;padding:.38rem;border-radius:var(--radius-sm);font-size:.72rem;font-weight:500;color:var(--text-muted);border:1px solid var(--border-subtle);transition:all .15s}
.reset-btn:hover{color:var(--text-primary);border-color:var(--border)}

/* bottom bar */
#bottomBar{
  position:fixed;bottom:0;left:0;right:0;height:var(--footer-h);
  display:flex;align-items:center;justify-content:space-between;
  padding:0 1rem;background:rgba(10,10,15,.95);backdrop-filter:blur(20px);
  border-top:1px solid var(--border-subtle);z-index:100;gap:.75rem;
}
.undo-redo{display:flex;align-items:center;gap:.35rem}
.ctrl-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--radius-sm);color:var(--text-secondary);border:1px solid var(--border);transition:all .15s}
.ctrl-btn:hover:not(:disabled){color:var(--text-primary);border-color:var(--accent)}
.ctrl-btn:disabled{opacity:.3;cursor:not-allowed}
.history-count{font-family:var(--mono);font-size:.68rem;color:var(--text-muted);min-width:1.5rem;text-align:center}
.main-actions{display:flex;align-items:center;gap:.4rem}
.action-btn{display:flex;align-items:center;gap:.35rem;padding:.46rem .9rem;border-radius:var(--radius-md);font-size:.8rem;font-weight:500;transition:all .18s var(--ease-out);white-space:nowrap}
.action-btn:disabled{opacity:.4;cursor:not-allowed}
.action-btn.secondary{background:var(--bg-elevated);border:1px solid var(--border);color:var(--text-secondary)}
.action-btn.secondary:hover:not(:disabled){border-color:var(--accent);color:var(--text-primary)}
.action-btn.primary{background:var(--accent);color:#fff;box-shadow:0 0 16px var(--accent-glow)}
.action-btn.primary:hover:not(:disabled){background:var(--accent-hover)}
.action-btn.accent{background:var(--accent-done);color:#fff;box-shadow:0 0 16px var(--accent-done-glow)}
.action-btn.accent:hover:not(:disabled){opacity:.9}
.action-btn.small{padding:.35rem .75rem;font-size:.75rem}

/* modal */
.modal-backdrop{
  position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.65);backdrop-filter:blur(8px);
  display:flex!important;align-items:center;justify-content:center;padding:1rem;
}
.modal-backdrop.hidden{display:none!important}
.modal{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:1.25rem;width:100%;max-width:280px;display:flex;flex-direction:column;gap:.85rem;animation:modal-in .22s var(--ease-spring)}
@keyframes modal-in{from{opacity:0;transform:scale(.92) translateY(8px)}to{opacity:1;transform:none}}
.modal-title{font-size:.88rem;font-weight:600;text-align:center}
.format-btns{display:flex;gap:.35rem}
.fmt-btn{flex:1;padding:.45rem;border-radius:var(--radius-sm);font-size:.78rem;font-weight:500;border:1px solid var(--border);color:var(--text-secondary);transition:all .15s}
.fmt-btn.active{border-color:var(--accent);color:var(--accent);background:rgba(124,106,245,.1)}
.modal-actions{display:flex;gap:.4rem;justify-content:flex-end}

::-webkit-scrollbar{width:3px;height:3px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}