:root {
    --bg: #f8f9fb;
    --bg2: #ffffff;
    --bg3: #f0f1f4;
    --surface: #ffffff;
    --surface2: #f4f5f7;
    --border: #e2e4ea;
    --border2: #d1d5db;
    --text: #1a1d26;
    --text2: #5f6577;
    --text3: #9ca3af;
    --accent: #10b981;
    --accent2: #059669;
    --accent-glow: rgba(16,185,129,0.1);
    --danger: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.1);
    --font: 'DM Sans', system-ui, sans-serif;
    --mono: 'Space Mono', monospace;
    --header-h: 44px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-font-smoothing:antialiased}
html,body{height:100%;overflow:hidden}
body{font-family:var(--font);background:var(--bg);color:var(--text)}

#app{display:flex;flex-direction:column;height:100dvh;overflow:hidden}

/* HEADER */
.header{display:flex;align-items:center;justify-content:space-between;padding:0 1.5rem;height:var(--header-h);min-height:var(--header-h);border-bottom:1px solid var(--border);background:var(--bg2);flex-shrink:0;box-shadow:var(--shadow-sm)}
.logo{display:flex;align-items:center;gap:.5rem}
.logo-icon{width:24px;height:24px}
.logo-text{font-family:var(--mono);font-weight:700;font-size:1rem;letter-spacing:-.02em;color:var(--text)}
.tagline{font-size:.72rem;color:var(--text3)}

/* UPLOAD */
.upload-zone{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:1.5rem;overflow:auto}
.upload-box{width:100%;max-width:480px;border:2px dashed var(--border2);border-radius:20px;padding:2.5rem 1.5rem;text-align:center;cursor:pointer;transition:all .2s;background:var(--bg2);box-shadow:var(--shadow-sm)}
.upload-box:hover,.upload-box.drag-over{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-glow),var(--shadow-md);transform:translateY(-2px)}
.upload-icon{width:48px;height:48px;margin:0 auto .8rem;opacity:.55}
.upload-title{font-size:1.1rem;font-weight:700;margin-bottom:.3rem}
.upload-sub{color:var(--text2);font-size:.85rem;margin-bottom:.3rem}
.upload-formats{color:var(--text3);font-size:.7rem;font-family:var(--mono)}
.link-btn{background:none;border:none;color:var(--accent2);cursor:pointer;font-family:inherit;font-size:inherit;text-decoration:underline;text-underline-offset:2px}
.link-btn:hover{color:var(--accent)}

/* Model status */
.model-status{margin-top:1.2rem;display:flex;align-items:center;gap:.6rem;font-size:.72rem;color:var(--text3);font-family:var(--mono)}
.model-progress-wrap{width:100px;height:4px;background:var(--bg3);border-radius:4px;overflow:hidden}
.model-progress-bar{height:100%;width:0%;background:var(--accent);border-radius:4px;transition:width .3s}
.model-status.ready .model-progress-bar{width:100%}
.model-status.loading .model-progress-bar{animation:indeterminate 1.5s ease-in-out infinite}
@keyframes indeterminate{0%{width:0;margin-left:0}50%{width:60%;margin-left:20%}100%{width:0;margin-left:100%}}

/* Model switcher */
.model-switcher{display:flex;gap:10px;margin-top:1rem;max-width:480px;width:100%}
.model-opt{display:flex;align-items:center;gap:.7rem;flex:1;padding:.7rem .8rem;border:1.5px solid var(--border);border-radius:var(--radius);background:var(--bg2);cursor:pointer;transition:all .15s;text-align:left;font-family:var(--font)}
.model-icon{width:40px;height:40px;flex-shrink:0;color:var(--text3);transition:color .15s}
.model-info{display:flex;flex-direction:column;gap:1px;min-width:0}
.model-info strong{font-size:.82rem;color:var(--text);line-height:1.2}
.model-info span{font-size:.68rem;color:var(--text3);line-height:1.3}
.model-size{font-family:var(--mono);font-size:.6rem!important}
.model-opt:hover{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}
.model-opt.active{border-color:var(--accent);background:var(--accent-glow)}
.model-opt.active .model-icon{color:var(--accent2)}
.model-opt.active .model-info strong{color:var(--accent2)}

/* PROCESSING */
.processing-view{flex:1;display:flex;align-items:center;justify-content:center;padding:1.5rem;overflow:hidden}
.processing-card{display:flex;flex-direction:column;align-items:center;gap:1.2rem;max-width:440px;width:100%}
.processing-preview-wrap{border-radius:var(--radius);overflow:hidden;background:var(--bg2);box-shadow:var(--shadow-md);width:100%}
#previewCanvas{display:block;width:100%;height:auto;max-height:45dvh;object-fit:contain}
.processing-info{width:100%;text-align:center}
.processing-text{font-weight:600;font-size:.9rem;margin-bottom:.6rem}
.progress-wrap{width:100%;height:5px;background:var(--bg3);border-radius:6px;overflow:hidden;margin-bottom:.4rem}
.progress-bar{height:100%;width:0%;background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:6px;transition:width .2s}
.progress-bar.indeterminate{animation:indeterminate 1.5s ease-in-out infinite}
.processing-hint{font-size:.7rem;font-family:var(--mono);color:var(--text3)}

/* EDITOR — strict viewport fit */
.editor-view{flex:1;display:flex;flex-direction:column;min-height:0;overflow:hidden}

.toolbar{display:flex;align-items:center;justify-content:space-between;padding:.3rem .75rem;background:var(--bg2);border-bottom:1px solid var(--border);gap:.4rem;flex-shrink:0;flex-wrap:wrap}
.toolbar-group{display:flex;gap:.2rem}
.tool-btn{display:flex;align-items:center;gap:.35rem;padding:.4rem .65rem;border:1px solid transparent;border-radius:var(--radius-sm);background:transparent;color:var(--text2);font-family:var(--font);font-size:.78rem;font-weight:500;cursor:pointer;transition:all .12s;white-space:nowrap}
.tool-btn svg{width:17px;height:17px;flex-shrink:0}
.tool-btn:hover{color:var(--text);background:var(--bg3)}
.tool-btn.active{color:var(--accent2);border-color:var(--accent);background:var(--accent-glow)}
.tool-btn.accent{background:var(--accent);color:#fff;font-weight:700;border-color:var(--accent)}
.tool-btn.accent:hover{background:var(--accent2)}
.tool-btn.accent svg{stroke:#fff}

/* Sub-panels */
.sub-panel{display:none;padding:.45rem .75rem;background:var(--surface2);border-bottom:1px solid var(--border);gap:.8rem;flex-wrap:wrap;align-items:center;flex-shrink:0}
.sub-panel.active{display:flex}
.panel-row{display:flex;align-items:center;gap:.5rem;font-size:.78rem;color:var(--text2)}
.panel-row label{white-space:nowrap;min-width:40px}
.toggle-group{display:flex;gap:2px}
.toggle-btn{padding:.28rem .6rem;border:1px solid var(--border);background:var(--bg2);color:var(--text3);font-family:var(--font);font-size:.72rem;cursor:pointer;transition:all .12s}
.toggle-btn:first-child{border-radius:6px 0 0 6px}
.toggle-btn:last-child{border-radius:0 6px 6px 0}
.toggle-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.color-swatches{display:flex;gap:4px;flex-wrap:wrap}
.swatch{width:24px;height:24px;border-radius:5px;border:2px solid var(--border);cursor:pointer;transition:all .12s;padding:0;overflow:hidden}
.swatch svg{width:100%;height:100%;display:block}
.swatch:hover{transform:scale(1.15)}
.swatch.active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-glow)}
input[type="range"]{-webkit-appearance:none;appearance:none;height:4px;background:var(--bg3);border-radius:4px;outline:none;flex:1;max-width:120px}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;border:2px solid #fff;box-shadow:var(--shadow-sm)}
input[type="color"]{width:28px;height:24px;border:2px solid var(--border);border-radius:5px;background:none;cursor:pointer;padding:0}

/* Canvas area — fills remaining space */
.canvas-area{flex:1;display:flex;padding:.5rem;overflow:hidden;background:var(--bg);min-height:0}
.side-by-side{display:flex;gap:.5rem;width:100%;min-height:0}
.panel-card{flex:1;display:flex;flex-direction:column;background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);min-height:0;min-width:0}
.panel-card-header{display:flex;align-items:center;justify-content:space-between;padding:.35rem .6rem;border-bottom:1px solid var(--border);background:var(--surface2);flex-shrink:0}
.panel-label{font-size:.68rem;font-family:var(--mono);font-weight:700;color:var(--text3);text-transform:uppercase;letter-spacing:.04em}
.new-image-btn{display:flex;align-items:center;gap:.25rem;padding:.2rem .5rem;border:1px dashed var(--border2);border-radius:5px;background:var(--bg2);color:var(--text2);font-family:var(--font);font-size:.68rem;font-weight:600;cursor:pointer;transition:all .12s}
.new-image-btn svg{width:13px;height:13px}
.new-image-btn:hover{border-color:var(--accent);color:var(--accent2);background:var(--accent-glow)}
.panel-card-canvas{flex:1;display:flex;align-items:center;justify-content:center;padding:.5rem;min-height:0;overflow:hidden;position:relative}
.panel-card-canvas canvas{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;border-radius:3px}
.checker-bg{background-image:linear-gradient(45deg,#e8e8ec 25%,transparent 25%),linear-gradient(-45deg,#e8e8ec 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#e8e8ec 75%),linear-gradient(-45deg,transparent 75%,#e8e8ec 75%);background-size:14px 14px;background-position:0 0,0 7px,7px -7px,-7px 0}
.brush-cursor{position:absolute;border:2px solid var(--accent);border-radius:50%;pointer-events:none;display:none;transform:translate(-50%,-50%);z-index:20}

/* DOWNLOAD MODAL */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.25);backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}
.modal{background:var(--bg2);border:1px solid var(--border);border-radius:16px;padding:1.2rem;width:100%;max-width:380px;box-shadow:var(--shadow-lg);animation:modalIn .2s ease-out}
@keyframes modalIn{from{opacity:0;transform:translateY(8px) scale(.98)}to{opacity:1;transform:translateY(0) scale(1)}}
.modal h3{font-size:1rem;font-weight:700;margin-bottom:.8rem}
.modal-section{margin-bottom:.7rem}
.modal-label{display:block;font-size:.7rem;font-family:var(--mono);color:var(--text3);text-transform:uppercase;letter-spacing:.04em;margin-bottom:.35rem}
.modal-formats{display:flex;gap:.35rem}
.format-btn,.size-btn,.quality-btn{flex:1;padding:.45rem .3rem;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);color:var(--text2);font-family:var(--font);font-size:.78rem;cursor:pointer;transition:all .12s;text-align:center;line-height:1.3}
.format-btn:hover,.size-btn:hover,.quality-btn:hover{border-color:var(--text3)}
.format-btn.active,.size-btn.active,.quality-btn.active{border-color:var(--accent);color:var(--accent2);background:var(--accent-glow)}
.size-hint{display:block;font-size:.6rem;color:var(--text3);font-family:var(--mono)}
.modal-preview{background:var(--bg);border-radius:var(--radius-sm);padding:.5rem;margin-bottom:.7rem;font-family:var(--mono);font-size:.68rem;color:var(--text3);text-align:center}
.modal-actions{display:flex;gap:.4rem}
.btn-primary{flex:1;padding:.6rem;border:none;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-family:var(--font);font-size:.85rem;font-weight:700;cursor:pointer;transition:background .12s}
.btn-primary:hover{background:var(--accent2)}
.btn-secondary{flex:.5;padding:.6rem;border:1px solid var(--border);border-radius:var(--radius-sm);background:transparent;color:var(--text2);font-family:var(--font);font-size:.85rem;cursor:pointer}
.btn-secondary:hover{border-color:var(--text3)}

/* FOOTER */
.footer{padding:.5rem;text-align:center;font-size:.68rem;color:var(--text3);border-top:1px solid var(--border);flex-shrink:0}

.hidden{display:none !important}

/* MOBILE */
@media(max-width:700px){
    .header{padding:0 .75rem;height:38px;min-height:38px}
    .tagline{display:none}
    .logo-icon{width:20px;height:20px}
    .logo-text{font-size:.9rem}
    .upload-box{padding:1.8rem 1rem}
    .upload-title{font-size:1rem}
    .toolbar{padding:.25rem .4rem}
    .tool-btn{padding:.3rem .4rem;font-size:.7rem}
    .tool-btn span{display:none}
    .tool-btn svg{width:19px;height:19px}
    .sub-panel{padding:.35rem .5rem;gap:.4rem}
    .canvas-area{padding:.35rem}
    .side-by-side{flex-direction:column}
    .panel-card-canvas{min-height:100px}
    .panel-card-canvas canvas{max-height:30dvh}
    .new-image-btn span{display:none}
    .model-switcher{gap:6px;flex-direction:column}
    .model-opt{padding:.5rem .6rem}
    .model-icon{width:32px;height:32px}
}

.fade-in{animation:fadeIn .25s ease-out}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}