*,:after,:before{box-sizing:border-box}body,html{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;background:radial-gradient(1200px 600px at 50% -200px,#c7d2fe 0,transparent 60%),linear-gradient(180deg,#eef2ff,#fff 60%);color:#0f172a}.upload-section{min-height:100vh;padding:48px 16px 80px;display:flex;justify-content:center}.upload-card{width:100%;max-width:760px;padding:28px;border-radius:28px;background:#fff;box-shadow:0 40px 80px rgba(79,70,229,.18)}.upload-dropzone{border:2px dashed rgba(99,102,241,.35);border-radius:24px;padding:56px 24px;text-align:center}.upload-dropzone.drag-active{border-color:#4f46e5}.upload-inner{flex-direction:column;gap:14px}.upload-icon,.upload-inner{display:flex;align-items:center}.upload-icon{width:64px;height:64px;border-radius:20px;font-size:28px;justify-content:center}.upload-cta,.upload-icon{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff}.upload-cta{padding:14px 34px;border-radius:999px;font-weight:700}.upload-meta{margin-top:14px;text-align:center}.preview-box{margin-top:20px;border-radius:18px;background:#fff;box-shadow:0 12px 32px rgba(0,0,0,.08);max-height:420px;overflow-y:auto}.preview-box-header{position:-webkit-sticky;position:sticky;top:0;background:#f8fafc;padding:12px 16px;font-weight:700;border-bottom:1px solid #e5e7eb}.preview-box-content{padding:14px;display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px}.preview-thumb{position:relative;border-radius:14px;border:1px solid #e5e7eb;cursor:pointer}.preview-thumb img{width:100%;height:100%;object-fit:contain;pointer-events:none}.preview-thumb.selected{outline:3px solid #6366f1}.preview-disabled{opacity:.45}.preview-index{top:6px;left:6px;padding:2px 7px}.preview-index,.preview-select{position:absolute;background:#0f172a;color:#fff;border-radius:999px}.preview-select{bottom:6px;right:6px;font-size:11px;padding:3px 6px}.primary-button{margin-top:22px;width:100%;padding:16px;border-radius:16px;border:none;background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;font-size:16px;font-weight:800}