*{box-sizing:border-box}
:root{
  font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:#171717;background:#f5f5f7;
  color-scheme:light;
}
html,body{margin:0;min-height:100%;background:#f5f5f7}
body{padding:0}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.app-shell{max-width:1500px;margin:0 auto;padding:20px 24px 36px}
.app-header{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:12px 0 18px;background:rgba(245,245,247,.92);backdrop-filter:blur(14px)}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{width:44px;height:44px;display:grid;place-items:center;border-radius:12px;background:#111;color:#fff;font-weight:900;letter-spacing:-1px}
.brand h1{font-size:20px;line-height:1.2;margin:0 0 3px;letter-spacing:-.3px}
.brand p{margin:0;color:#777;font-size:12px}
.header-actions{display:flex;gap:8px}
.btn{border:1px solid #ddd;border-radius:11px;padding:10px 15px;font-weight:800;min-height:42px}
.btn-primary{background:#d71920;color:#fff;border-color:#d71920;box-shadow:0 5px 15px rgba(215,25,32,.2)}
.btn-ghost{background:#fff;color:#333}
.mobile-tip{display:flex;gap:8px;align-items:center;padding:10px 13px;margin:0 0 16px;border:1px solid #e7e0cf;background:#fffaf0;border-radius:11px;color:#6c5a32;font-size:12px}
.workspace{display:grid;grid-template-columns:minmax(320px,390px) minmax(0,1fr);gap:22px;align-items:start}
.editor-panel{background:#fff;border:1px solid #e4e4e7;border-radius:18px;padding:18px;box-shadow:0 10px 35px rgba(0,0,0,.055)}
.section-heading{margin-bottom:16px}
.eyebrow{display:block;text-transform:uppercase;letter-spacing:.11em;font-size:10px;font-weight:800;color:#999;margin-bottom:4px}
.section-heading h2{margin:0;font-size:17px}
.field{margin-bottom:14px}
label{display:block;font-size:12px;font-weight:800;margin-bottom:7px}
.label-row{display:flex;justify-content:space-between;align-items:center}
.counter{font-size:10px;color:#999}
textarea,input[type=file],select,input[type=number]{width:100%;border:1px solid #d9d9de;border-radius:10px;background:#fff;padding:10px 11px;color:#222}
textarea{resize:vertical;line-height:1.45;min-height:76px}
textarea:focus,input:focus,select:focus{outline:3px solid rgba(215,25,32,.1);border-color:#d71920}
.file-input{position:absolute;width:1px!important;height:1px;opacity:0;pointer-events:none}
.dropzone{border:1.5px dashed #c9c9ce;border-radius:13px;padding:18px 12px;text-align:center;background:#fafafa;color:#666;transition:.18s}
.dropzone:hover,.dropzone:focus,.dropzone.drag{border-color:#d71920;background:#fff7f7;outline:none}
.drop-icon{font-size:24px;font-weight:900;line-height:1;margin-bottom:7px}
.dropzone strong,.dropzone span,.dropzone small{display:block}
.dropzone strong{font-size:13px;color:#333;margin-bottom:4px}
.dropzone span{font-size:11px}
.dropzone small{font-size:10px;color:#999;margin-top:6px}
.status{min-height:17px;margin-top:5px;color:#27824c;font-size:11px}
.settings{border-top:1px solid #eee;padding-top:12px;margin-top:12px}
.settings summary{cursor:pointer;font-size:12px;font-weight:900;list-style:none}
.settings summary::-webkit-details-marker{display:none}
.settings summary:after{content:"+";float:right;color:#999}
.settings[open] summary:after{content:"−"}
.settings[open] summary{margin-bottom:13px}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.slider-row{display:grid;grid-template-columns:42px 1fr 52px;align-items:center;gap:8px;margin:11px 0;font-size:11px}
.slider-row output{text-align:right;color:#555}
input[type=range]{padding:0;accent-color:#d71920}
.preview-panel{min-width:0}
.preview-toolbar{display:flex;justify-content:space-between;align-items:end;margin:2px 0 10px;padding:0 2px}
.preview-toolbar strong{font-size:13px}
.ready-dot{font-size:11px;color:#5d6b61;display:flex;gap:6px;align-items:center}
.ready-dot i{width:7px;height:7px;border-radius:50%;background:#39a65c;display:inline-block}
.preview-wrap{width:min(86vh,900px,100%);max-width:100%;margin:0 auto;border-radius:16px;overflow:hidden;background:#111;box-shadow:0 18px 55px rgba(0,0,0,.18)}
canvas{display:block;width:100%;height:auto}
.preview-hint{text-align:center;color:#888;font-size:11px;margin:10px 0}
@media(max-width:1050px){
  .workspace{grid-template-columns:340px minmax(0,1fr);gap:16px}
  .app-shell{padding-left:16px;padding-right:16px}
}
@media(max-width:820px){
  .app-header{position:static}
  .workspace{grid-template-columns:1fr}
  .editor-panel{order:2}
  .preview-panel{order:1}
  .preview-wrap{width:min(92vw,720px)}
  .mobile-tip{font-size:11px}
}
@media(max-width:560px){
  .app-shell{padding:10px 10px 24px}
  .app-header{align-items:flex-start;padding:8px 0 12px}
  .brand-mark{width:38px;height:38px;border-radius:10px}
  .brand h1{font-size:16px}
  .brand p{font-size:10px}
  .header-actions .btn-ghost{display:none}
  .btn{padding:9px 12px;min-height:38px}
  .mobile-tip{margin-bottom:10px}
  .editor-panel{border-radius:14px;padding:14px}
  .preview-wrap{border-radius:11px}
  .settings-grid{grid-template-columns:1fr 1fr}
}
@media(prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important}
}