:root{font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;color:#172033;background:#edf3fb;line-height:1.5;font-synthesis:none}*{box-sizing:border-box}body{margin:0;min-width:320px}.app-shell{max-width:1440px;margin:auto;padding:42px}.topbar{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:28px}.eyebrow,.export-kicker{margin:0 0 8px;color:#1769ff;font-size:12px;font-weight:800;letter-spacing:.18em}.topbar h1{margin:0;font-size:34px;letter-spacing:-.04em}.subtitle{margin:8px 0 0;color:#6b768b}.header-actions{display:flex;gap:10px}.button{display:inline-flex;align-items:center;justify-content:center;height:44px;padding:0 18px;border-radius:12px;border:0;font:inherit;font-weight:700;cursor:pointer;transition:.2s}.button:hover{transform:translateY(-1px)}.secondary{background:#fff;color:#1769ff;box-shadow:0 6px 18px #31547b12}.ghost{background:transparent;color:#6b768b}.primary{height:50px;background:#1769ff;color:#fff;box-shadow:0 10px 24px #1769ff38}.workspace{display:grid;grid-template-columns:410px minmax(0,1fr);gap:24px}.panel,.preview-card,.export-card{background:#fff;border:1px solid #dce5f1;border-radius:22px;box-shadow:0 16px 50px #334b6812}.controls{padding:24px;max-height:calc(100vh - 160px);overflow:auto}.section-heading{display:flex;align-items:center;gap:10px;margin:4px 0 16px}.section-heading:not(:first-child){margin-top:28px}.section-heading span{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:#eaf2ff;color:#1769ff;font-size:11px;font-weight:800}.section-heading h2{margin:0;font-size:16px}.upload-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.upload-card{padding:14px;border:1px dashed #b9c9dd;border-radius:14px;background:#f8fbff;cursor:pointer}.upload-card:hover{border-color:#1769ff}.upload-title,.upload-meta{display:block}.upload-title{font-weight:700;font-size:14px}.upload-meta{margin-top:4px;color:#8290a5;font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px 12px}.field{display:grid;gap:7px}.field:first-child{grid-column:1/-1}.field span{font-size:12px;font-weight:650;color:#67748a}.field input,.field select{width:100%;height:40px;padding:0 11px;border:1px solid #d9e2ee;border-radius:10px;background:#fbfdff;color:#172033;font:inherit;outline:none}.field input:focus,.field select:focus{border-color:#1769ff;box-shadow:0 0 0 3px #1769ff16}.stage-column{display:grid;align-content:start;gap:16px}.preview-card{padding:18px}.preview-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.preview-toolbar>div{display:flex;align-items:center;gap:12px}.preview-toolbar span{font-size:12px;color:#8a96a8}.icon-button{height:34px;padding:0 13px;border:0;border-radius:9px;background:#edf3fb;color:#4b5d75;font-weight:700;cursor:pointer}.stage-wrap{height:min(67vh,720px);min-height:470px;display:grid;place-items:center;overflow:hidden;border-radius:16px;background-color:#eef3f9;background-image:linear-gradient(45deg,#e4ebf4 25%,transparent 25%),linear-gradient(-45deg,#e4ebf4 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#e4ebf4 75%),linear-gradient(-45deg,transparent 75%,#e4ebf4 75%);background-size:24px 24px;background-position:0 0,0 12px,12px -12px,-12px 0}.stage{position:relative;width:885px;height:990px;transform-origin:center;overflow:hidden;background:#fff}.stage img{position:absolute;display:block;user-select:none;pointer-events:none}.stage #backgroundPreview{inset:0;width:100%;height:100%;object-fit:fill}.stage #buttonPreview{transform-origin:center;will-change:transform}.empty-state{position:absolute;inset:0;display:grid;place-items:center;color:#8d99aa;background:#f8fbff}.timeline{height:4px;margin-top:14px;border-radius:99px;background:#e7edf5;overflow:hidden}.timeline div{height:100%;width:0;background:#1769ff}.export-card{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 24px}.export-card h2{margin:0;font-size:19px}.export-card p:not(.export-kicker){margin:4px 0 0;color:#78869a;font-size:13px}.export-kicker{margin-bottom:3px}.message{min-height:24px;padding:0 4px;color:#567;font-size:13px}.message.error{color:#d54141}@media(max-width:980px){.app-shell{padding:24px}.workspace{grid-template-columns:1fr}.controls{max-height:none}.stage-wrap{height:600px}.topbar{align-items:flex-start;flex-direction:column}}@media(max-width:560px){.app-shell{padding:14px}.topbar h1{font-size:28px}.header-actions{width:100%}.header-actions>*{flex:1}.field-grid{grid-template-columns:1fr}.field:first-child{grid-column:auto}.export-card{align-items:stretch;flex-direction:column}}
.empty-state[hidden]{display:none}
.stage-wrap{position:relative;display:block}
.stage{position:absolute;left:50%;top:50%;margin:0}
.stage{background:transparent}
.paste-hint{margin:9px 2px 0;color:#8a96a8;font-size:11px}.upload-card{position:relative;outline:none}.upload-card.active-target{border-color:#1769ff;background:#f1f6ff;box-shadow:0 0 0 3px #1769ff12}.upload-card.drag-over{border-style:solid;border-color:#1769ff;background:#e8f1ff;transform:translateY(-1px)}
.library-head{display:flex;align-items:center;justify-content:space-between;margin:16px 2px 8px;font-size:12px}.library-head button{padding:0;border:0;background:transparent;color:#8b97a9;font:inherit;cursor:pointer}.library-head button:hover{color:#d54141}.material-library{display:flex;gap:8px;min-height:58px;padding:8px;overflow-x:auto;border:1px solid #e2e9f2;border-radius:12px;background:#f8fbff}.library-empty{margin:auto;color:#9aa6b7;font-size:11px}.material-item{position:relative;flex:0 0 54px;width:54px;height:54px;padding:0;overflow:hidden;border:2px solid transparent;border-radius:9px;background:#e8eef6;cursor:pointer}.material-item:hover{border-color:#1769ff}.material-item img{width:100%;height:100%;object-fit:cover}.material-item .type-dot{position:absolute;right:3px;bottom:3px;width:16px;height:16px;display:grid;place-items:center;border-radius:5px;background:#172033cc;color:#fff;font-size:9px;font-weight:800}.material-item .remove-item{position:absolute;right:2px;top:2px;width:17px;height:17px;display:none;place-items:center;border:0;border-radius:50%;background:#172033cc;color:#fff;font-size:12px;line-height:1}.material-item:hover .remove-item{display:grid}
@media(min-width:981px){html,body{height:100%;overflow:hidden}.app-shell{height:100vh;display:flex;flex-direction:column;padding-top:28px;padding-bottom:24px}.topbar{flex:0 0 auto;margin-bottom:20px}.workspace{flex:1;min-height:0}.controls{height:100%;max-height:none}.stage-column{height:100%;min-height:0;grid-template-rows:minmax(0,1fr) auto auto}.preview-card{min-height:0;display:flex;flex-direction:column}.preview-toolbar{flex:0 0 auto}.stage-wrap{flex:1;height:auto;min-height:0}.timeline{flex:0 0 auto}.export-card{min-height:86px;padding-top:16px;padding-bottom:16px}.message{position:absolute;right:48px;bottom:2px}.header-actions{flex-wrap:nowrap}.header-actions .button{white-space:nowrap}}
.json-drop-tip{position:absolute;inset:14px;z-index:10;display:none;place-items:center;border:2px dashed #1769ff;border-radius:14px;background:#eaf2fff2;color:#1769ff;font-size:16px;font-weight:800;pointer-events:none}.stage-wrap.json-drag-over .json-drop-tip{display:grid}