:root{
  --bg:#f4f6fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:#e5e7eb;
  --dark:#111827;
  --primary:#7c3aed;
  --primary2:#a855f7;
  --success:#16a34a;
  --soft:#f3f4f6;
  --radius:22px;
  --shadow:0 18px 45px rgba(15,23,42,.08);
}
*{box-sizing:border-box}
body{margin:0;background:radial-gradient(circle at top left,#ede9fe,transparent 35%),var(--bg);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;color:var(--text)}
.shell{min-height:100vh;display:grid;grid-template-columns:280px 1fr}
.sidebar{background:#0f172a;color:#fff;padding:28px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:34px}
.brand{display:flex;align-items:center;gap:14px}.brand-icon{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--primary),#22c55e);display:grid;place-items:center;font-weight:900}.brand strong{display:block;font-size:18px}.brand span{font-size:13px;color:#cbd5e1}.steps{display:grid;gap:14px}.step{display:flex;align-items:center;gap:12px;color:#cbd5e1;padding:12px;border-radius:14px}.step.active{background:rgba(255,255,255,.08);color:#fff}.step b{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.14)}.note{margin-top:auto;background:rgba(255,255,255,.08);padding:18px;border-radius:18px}.note p{color:#cbd5e1;font-size:13px;line-height:1.45;margin-bottom:0}
.workspace{padding:30px}.topbar{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:24px}.eyebrow{margin:0 0 8px;text-transform:uppercase;letter-spacing:.14em;color:var(--primary);font-size:12px;font-weight:800}.topbar h1{margin:0;font-size:34px;line-height:1.08}.topbar p:not(.eyebrow){margin:10px 0 0;color:var(--muted)}
.grid{display:grid;grid-template-columns:minmax(380px,520px) 1fr;gap:24px;align-items:start}.panel{background:rgba(255,255,255,.86);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.9);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.panel-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:18px}.panel-head.compact{margin-top:26px}.panel h2{margin:0;font-size:18px}.panel-head span{color:var(--muted);font-size:13px}
label{display:block;font-size:13px;font-weight:800;margin:14px 0 7px;color:#374151}textarea,select,input[type=file]{width:100%;border:1px solid var(--line);border-radius:16px;background:#fff;padding:14px 15px;font:inherit;outline:none}textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(124,58,237,.12)}textarea{text-transform:uppercase;resize:vertical}.hint{color:var(--muted)}
.actions-row{display:flex;gap:10px;align-items:center;margin:14px 0}.btn{border:0;border-radius:15px;padding:13px 16px;font-weight:900;cursor:pointer;text-decoration:none;display:inline-flex;justify-content:center;align-items:center;gap:8px;transition:.2s}.btn:hover{transform:translateY(-1px)}.primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}.soft{background:var(--soft);color:#111}.ghost{background:#fff;color:#111;border:1px solid var(--line)}.dark{background:#111827;color:#fff}.success{background:var(--success);color:#fff}.hidden{display:none!important}
.upload-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.upload-card{border:1px dashed #cbd5e1;background:#f8fafc;border-radius:18px;padding:14px;cursor:pointer;margin:0}.upload-card span{display:block;font-weight:900;margin-bottom:8px}.upload-card input{display:none}.upload-card em{font-style:normal;color:var(--muted);font-size:13px;word-break:break-all}.slider-box{margin-top:16px;padding:16px;border-radius:18px;background:#f8fafc;border:1px solid #eef2f7}.slider-box h3{margin:0 0 10px;font-size:15px}.slider-box input[type=range]{width:100%;accent-color:var(--primary)}.sticky-actions{position:sticky;bottom:12px;background:rgba(255,255,255,.88);backdrop-filter:blur(8px);padding:12px;border-radius:18px;border:1px solid var(--line)}
.preview-panel{position:sticky;top:24px}.preview-wrap{background:#111827;border-radius:24px;padding:18px;display:grid;place-items:center;min-height:600px;overflow:hidden}canvas{display:block;width:min(100%,520px);height:auto;border-radius:8px;background:#fff;box-shadow:0 14px 35px rgba(0,0,0,.35)}.preview-footer{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:13px;margin-top:12px}
@media(max-width:1050px){.shell{grid-template-columns:1fr}.sidebar{position:relative;height:auto}.grid{grid-template-columns:1fr}.preview-panel{position:relative;top:0}.topbar{flex-direction:column}.workspace{padding:18px}.topbar h1{font-size:28px}}
@media(max-width:620px){.upload-grid{grid-template-columns:1fr}.actions-row{flex-direction:column;align-items:stretch}.btn{width:100%}.preview-wrap{min-height:auto;padding:10px}.sidebar{padding:20px}}