:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#0f172a;background:radial-gradient(circle at 10% 20%,#eef2ff 25%,transparent 30%),radial-gradient(circle at 90% 10%,#e0f2fe 20%,transparent 30%),#f8fafc;min-height:100vh}body{margin:0}.page{max-width:960px;margin:0 auto;padding:48px 20px 96px}header{margin-bottom:32px}.card{background:#fff;border-radius:16px;padding:20px;box-shadow:0 10px 30px #0f172a14;margin-bottom:20px}.file-input{display:flex;flex-direction:column;gap:8px;margin-bottom:12px;font-weight:600}button{background:linear-gradient(120deg,#2563eb,#0ea5e9);color:#fff;border:none;border-radius:10px;padding:12px 18px;font-weight:700;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.error{color:#b91c1c;background:#fee2e2;border:1px solid #fecaca;padding:12px;border-radius:10px;margin-bottom:20px}pre{background:#0f172a;color:#e2e8f0;padding:16px;border-radius:12px;overflow-x:auto}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}