:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#1f2933;background-color:#f5f7fb}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}main{max-width:960px;margin:0 auto;padding:32px 20px 48px}nav{display:flex;gap:16px;padding:16px 20px;background:#fff;border-bottom:1px solid #e5e7eb}nav a{padding:8px 12px;border-radius:8px;background:#f3f4f6}.card{background:#fff;border:1px solid #e5e7eb;border-radius:12px;padding:16px;margin-bottom:16px}button{border:none;border-radius:8px;background:#2563eb;color:#fff;padding:8px 12px;cursor:pointer}button.secondary{background:#6b7280}input,textarea{width:100%;border:1px solid #d1d5db;border-radius:8px;padding:8px 10px;font:inherit}label{display:block;font-weight:600;margin-bottom:8px}small{color:#6b7280}