:root{--bg:#fff;--muted:#6b7280;--accent:#0b74de;--accent2:#7c3aed;--card:#f9fafb}*{box-sizing:border-box}body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial;line-height:1.5;color:#111;background:var(--bg);margin:0}.header{border-bottom:1px solid #eef2f7;background:linear-gradient(90deg,#fff,#fbfdff)}.container{max-width:1100px;margin:0 auto;padding:20px}.nav{display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:12px}.logo{width:44px;height:44px;border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--accent2));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700}.nav-links{display:flex;gap:12px}.nav-links a{color:#374151;text-decoration:none;font-size:14px}.hero{padding:28px;background:linear-gradient(180deg,#fff,#fbfdff);border-radius:10px;margin:18px 0}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}@media(max-width:900px){.grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:600px){.nav-links{display:none}.grid{grid-template-columns:1fr}}.card{background:var(--card);padding:16px;border-radius:10px;box-shadow:0 6px 18px rgba(15,23,42,0.04);border:1px solid #eef2f7}.btn{background:var(--accent);color:#fff;padding:8px 12px;border-radius:8px;border:none;cursor:pointer}.btn-ghost{background:transparent;border:1px solid #e6e9ef;padding:8px 10px;border-radius:8px;cursor:pointer;color:#374151}.small{font-size:13px;padding:6px 10px;border-radius:8px}.file-list{list-style:none;padding:0;margin:8px 0;display:flex;flex-direction:column;gap:8px}.file-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px;border-radius:8px;background:#fff;border:1px solid #eef2f7}.controls{display:flex;gap:6px;align-items:center}.result{background:#fff;padding:12px;border-radius:8px;border:1px solid #eef2f7;min-height:80px;color:#111}.footer{margin-top:28px;padding:18px;text-align:center;color:var(--muted);font-size:14px;border-top:1px solid #f1f5f9}.h1{font-size:22px;font-weight:700;margin:0 0 8px}.lead{color:var(--muted);margin:0 0 16px}.small-muted{font-size:13px;color:var(--muted)}.ad{display:none}