*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0a0a0a;--surface:#111;--surface2:#1a1a1a;--surface3:#222;
  --accent:#c084fc;--accent2:#a855f7;--accent-dim:#7c3aed;
  --text:#f0f0f0;--text2:#888;--text3:#555;
  --green:#4ade80;--red:#f87171;--yellow:#fbbf24;--blue:#60a5fa;--orange:#fb923c;
  --border:#222;--border2:#333;
  --font:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono','Fira Code','Consolas',monospace;
}
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');
body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased}
::selection{background:var(--accent-dim);color:#fff}
input:focus{outline:none}

nav{display:flex;align-items:center;justify-content:center;gap:32px;padding:16px 20px;border-bottom:1px solid var(--border);flex-wrap:wrap}
nav .brand{font-size:15px;font-weight:700;letter-spacing:-.3px}
nav .brand span{color:var(--accent)}
nav a{color:var(--text2);font-size:13px;text-decoration:none;transition:color .15s}
nav a:hover{color:var(--text)}

.hero{text-align:center;padding:48px 20px 32px}
.hero h1{font-size:clamp(24px,5vw,38px);font-weight:700;letter-spacing:-.5px;line-height:1.15}
.hero h1 span{display:block;color:var(--text2);font-weight:400;font-size:.55em;margin-top:4px}
.hero p{color:var(--text2);font-size:13px;margin-top:10px;max-width:460px;margin-inline:auto}

.action-bar{display:flex;justify-content:center;gap:10px;margin:24px 0 32px;flex-wrap:wrap;padding:0 16px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 20px;border:1px solid var(--border2);
  border-radius:6px;font-family:var(--font);font-size:13px;font-weight:600;cursor:pointer;
  transition:all .15s;color:var(--text);background:var(--surface2)}
.btn:hover{background:var(--surface3);border-color:var(--text3)}
.btn-accent{background:var(--accent-dim);border-color:var(--accent-dim);color:#fff}
.btn-accent:hover{background:var(--accent2);border-color:var(--accent2)}
.btn-green{background:#166534;border-color:#166534;color:#fff}
.btn-green:hover{background:#15803d;border-color:#15803d}
.btn:disabled{opacity:.4;cursor:not-allowed}

.tabs{display:flex;justify-content:center;gap:0;margin:0 auto 24px;max-width:780px;border-bottom:1px solid var(--border);padding:0 16px}
.tab{padding:10px 24px;font-size:13px;font-weight:600;color:var(--text3);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s}
.tab:hover{color:var(--text2)}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.tab-content{display:none}
.tab-content.active{display:block}

.split-view{display:flex;gap:16px;max-width:1280px;margin:0 auto 32px;padding:0 16px;align-items:stretch}
.split-left{flex:1;min-width:0}
.split-right{flex:1;min-width:0;display:flex;flex-direction:column}

.result-box{background:var(--surface);border:1px solid var(--border);border-radius:10px;overflow:hidden;height:100%}
.result-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);font-size:12px;color:var(--text2);flex-wrap:wrap;gap:8px}

.cube-wrap{padding:16px;display:flex;justify-content:center}
.cube-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(3,1fr);gap:2px;width:100%;max-width:480px;aspect-ratio:4/3}
.cube-grid .face{position:relative;background:var(--surface2);overflow:hidden;display:flex;align-items:center;justify-content:center}
.cube-grid .face img{width:100%;height:100%;object-fit:cover;pointer-events:none}
.cube-grid .face[data-face]{cursor:grab;transition:outline .15s,opacity .15s}
.cube-grid .face[data-face]:active{cursor:grabbing}
.cube-grid .face[data-face].drag-over{outline:2px solid var(--accent);outline-offset:-2px}
.cube-grid .face .lbl{position:absolute;top:3px;left:50%;transform:translateX(-50%);font-size:9px;font-weight:700;color:var(--accent);text-shadow:0 1px 4px #000;opacity:.8}
.cube-grid .empty{background:transparent}

.face-list{padding:12px 16px;display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:4px}
.face-item{display:flex;align-items:center;gap:8px;padding:6px 8px;border-radius:6px;transition:background .1s;cursor:pointer}
.face-item:hover{background:var(--surface2)}
.face-item .tag{font-size:11px;font-weight:700;color:var(--accent);min-width:24px}
.face-item .fname{font-size:11px;color:var(--text2);text-decoration:underline;text-underline-offset:2px}

.overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(6px);z-index:100;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .2s;padding:16px}
.overlay.open{opacity:1;pointer-events:all}
.modal{background:var(--surface);border:1px solid var(--border);border-radius:12px;width:100%;max-width:520px;padding:24px;position:relative;transform:translateY(10px);transition:transform .2s;max-height:90vh;overflow-y:auto}
.overlay.open .modal{transform:translateY(0)}
.modal-close{position:absolute;top:12px;right:14px;background:none;border:none;color:var(--text3);font-size:20px;cursor:pointer;line-height:1;padding:4px}
.modal-close:hover{color:var(--text)}
.modal h2{font-size:16px;font-weight:700;margin-bottom:16px}
.modal .field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}
.modal .field label{font-size:11px;color:var(--text3);font-weight:500;text-transform:uppercase;letter-spacing:.5px}
.modal .field input{background:var(--surface2);border:1px solid var(--border);border-radius:6px;padding:9px 12px;color:var(--text);font-family:var(--font);font-size:13px;transition:border-color .15s}
.modal .field input:focus{border-color:var(--accent-dim)}

.upload-steps{margin:14px 0}
.upload-step{display:flex;align-items:center;gap:10px;padding:6px 0;font-size:12px;color:var(--text3)}
.upload-step .dot{width:22px;height:22px;border-radius:50%;border:2px solid var(--border2);display:flex;align-items:center;justify-content:center;font-size:10px;flex-shrink:0;transition:all .2s}
.upload-step.active{color:var(--text)}
.upload-step.active .dot{border-color:var(--accent);color:var(--accent);animation:pulse .8s infinite alternate}
.upload-step.done{color:var(--green)}
.upload-step.done .dot{border-color:var(--green);background:var(--green);color:var(--bg)}
.upload-step.err{color:var(--red)}
.upload-step.err .dot{border-color:var(--red);background:var(--red);color:#fff}
@keyframes pulse{from{box-shadow:0 0 0 0 rgba(124,58,237,.4)}to{box-shadow:0 0 0 6px rgba(124,58,237,0)}}

.modal-progress{height:4px;background:var(--surface2);border-radius:2px;margin:12px 0 8px;overflow:hidden}
.modal-progress .bar{height:100%;background:linear-gradient(90deg,var(--accent-dim),var(--accent2));transition:width .4s;width:0;border-radius:2px}

.json-box{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:14px;font-family:var(--mono);font-size:12px;line-height:1.7;margin-top:12px;max-height:200px;overflow-y:auto;cursor:pointer;white-space:pre-wrap;word-break:break-all}
.json-box:hover{border-color:var(--accent-dim)}
.j-key{color:var(--accent)}
.j-str{color:var(--green)}
.j-brace{color:var(--text3)}
.j-colon{color:var(--text3)}

.history-section{max-width:780px;margin:0 auto 40px;padding:0 16px}
.history-empty{text-align:center;padding:40px 20px;color:var(--text3);font-size:13px}
.history-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:12px}
.history-item .hi-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;flex-wrap:wrap;gap:8px}
.history-item .hi-name{font-weight:700;font-size:14px}
.history-item .hi-date{font-size:11px;color:var(--text3)}
.history-item .hi-faces{display:flex;gap:4px;flex-wrap:wrap;margin-bottom:10px}
.history-item .hi-face{width:48px;height:48px;border-radius:4px;overflow:hidden;border:1px solid var(--border)}
.history-item .hi-face img{width:100%;height:100%;object-fit:cover}
.hi-actions{display:flex;gap:8px;flex-wrap:wrap}
.hi-actions .btn{padding:6px 14px;font-size:11px}
.hi-del{color:var(--red);cursor:pointer;font-size:11px;padding:6px 10px;border:1px solid var(--border);border-radius:4px;background:none;transition:all .15s}
.hi-del:hover{border-color:var(--red);background:rgba(248,113,113,.1)}

.drop-overlay{position:fixed;inset:0;z-index:200;background:rgba(124,58,237,.12);border:3px dashed var(--accent);pointer-events:none;opacity:0;transition:opacity .2s;display:flex;align-items:center;justify-content:center}
.drop-overlay.visible{opacity:1}
.drop-overlay-text{font-size:18px;font-weight:700;color:var(--accent);padding:20px 40px;background:var(--surface);border-radius:12px;border:1px solid var(--accent-dim)}

.controls-bar{max-width:1280px;margin:0 auto 16px;padding:0 16px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.control-group{display:flex;align-items:center;gap:8px}
.control-group label{font-size:11px;color:var(--text3);font-weight:600;text-transform:uppercase;letter-spacing:.4px;white-space:nowrap}
.control-group select,.control-group input[type=range]{background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:var(--font);font-size:12px;padding:6px 10px;cursor:pointer}
.control-group select:focus{border-color:var(--accent-dim);outline:none}
.control-group input[type=range]{-webkit-appearance:none;appearance:none;width:140px;height:6px;padding:0;border:none;border-radius:3px;background:var(--surface3)}
.control-group input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid var(--bg)}
.control-group .range-val{font-size:11px;color:var(--text2);min-width:32px;text-align:center;font-family:var(--mono)}
.control-sep{width:1px;height:20px;background:var(--border2);flex-shrink:0}
.wm-check{font-size:11px;color:var(--text3);font-weight:600;text-transform:uppercase;letter-spacing:.4px;cursor:pointer;display:flex;align-items:center;gap:6px;white-space:nowrap}
.wm-check input{accent-color:var(--accent)}
.wm-input{background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:var(--font);font-size:11px;padding:5px 8px;width:100px}
.wm-input:focus{border-color:var(--accent-dim);outline:none}

.convert-progress{max-width:1280px;margin:0 auto 16px;padding:0 16px;display:none}
.convert-progress.visible{display:block}
.convert-progress-inner{height:4px;background:var(--surface2);border-radius:2px;overflow:hidden}
.convert-progress-inner .bar{height:100%;background:linear-gradient(90deg,var(--accent-dim),var(--accent2));transition:width .3s;width:0;border-radius:2px}
.convert-progress-label{font-size:11px;color:var(--text3);margin-top:6px;text-align:center}

.preview3d-box{background:var(--surface);border:1px solid var(--border);border-radius:10px;overflow:hidden;position:relative;flex:1;display:flex;flex-direction:column;height:100%}
.preview3d-box canvas{width:100%;height:100%;display:block;cursor:grab}
.preview3d-box canvas:active{cursor:grabbing}
.preview3d-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border);font-size:12px;color:var(--text2)}
.preview3d-hint{font-size:11px;color:var(--text3);padding:8px 16px;text-align:center}

.cube-grid .face[data-face] .face-replace-hint{position:absolute;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;font-size:9px;color:#fff;font-weight:600;opacity:0;transition:opacity .15s;pointer-events:none}
.cube-grid .face[data-face]:hover .face-replace-hint{opacity:1}

.batch-section{max-width:780px;margin:0 auto 40px;padding:0 16px}
.batch-header{display:flex;align-items:center;gap:10px;margin-bottom:16px;flex-wrap:wrap}
.batch-count{font-size:12px;color:var(--text3);margin-left:auto}
.batch-queue{display:flex;flex-direction:column;gap:8px}
.batch-item{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:12px 16px;display:flex;align-items:center;gap:12px}
.batch-item .batch-thumb{width:48px;height:24px;border-radius:4px;object-fit:cover;background:var(--surface2)}
.batch-item .batch-name{font-size:12px;font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.batch-item .batch-status{font-size:11px;color:var(--text3);min-width:80px;text-align:right}
.batch-item .batch-status.done{color:var(--green)}
.batch-item .batch-status.err{color:var(--red)}
.batch-item .batch-remove{background:none;border:none;color:var(--text3);cursor:pointer;font-size:14px;padding:4px}
.batch-item .batch-remove:hover{color:var(--red)}

.settings-section{max-width:480px;margin:0 auto 40px;padding:0 16px}
.settings-field{display:flex;flex-direction:column;gap:4px;margin-bottom:14px}
.settings-field label{font-size:11px;color:var(--text3);font-weight:600;text-transform:uppercase;letter-spacing:.5px}
.settings-field input{background:var(--surface2);border:1px solid var(--border);border-radius:6px;padding:9px 12px;color:var(--text);font-family:var(--font);font-size:13px;transition:border-color .15s}
.settings-field input:focus{border-color:var(--accent-dim);outline:none}

.tutorial-section{max-width:780px;margin:0 auto 40px;padding:0 16px}
.tut-step{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:12px}
.tut-step .tut-num{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;background:var(--accent-dim);color:#fff;font-size:13px;font-weight:700;margin-right:10px;flex-shrink:0}
.tut-step h3{display:inline;font-size:14px;font-weight:700;vertical-align:middle}
.tut-step p{margin-top:10px;font-size:13px;color:var(--text2);line-height:1.7}
.tut-step code{background:var(--surface2);border:1px solid var(--border);border-radius:4px;padding:2px 6px;font-family:var(--mono);font-size:12px;color:var(--accent)}
.tut-step a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.tut-step a:hover{color:var(--accent2)}
.tut-step ul{margin-top:8px;padding-left:20px;font-size:13px;color:var(--text2);line-height:1.8}
.tut-note{background:var(--surface2);border-left:3px solid var(--accent-dim);border-radius:0 6px 6px 0;padding:12px 16px;margin-top:10px;font-size:12px;color:var(--text3);line-height:1.6}

.hidden{display:none!important}
@media(max-width:900px){
  .split-view{flex-direction:column}
}
@media(max-width:600px){
  nav{gap:16px;padding:12px 16px}
  .hero{padding:32px 16px 24px}
  .hero h1{font-size:24px}
  .action-bar{gap:8px;margin:16px 0 24px}
  .btn{padding:8px 14px;font-size:12px}
  .tab{padding:8px 16px;font-size:12px}
  .cube-grid{max-width:100%}
  .face-list{grid-template-columns:1fr 1fr}
  .modal{padding:18px}
  .tut-step{padding:14px}
}