*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:linear-gradient(135deg,#eef2ff,#f8fafc);color:#1f2937}button,input{font:inherit}.app{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:24px}.app-card{width:100%;max-width:720px;padding:32px;background-color:#fff;border-radius:24px;box-shadow:0 24px 50px #0f172a1a}.profile{padding-top:28px}.profile h2{margin:0 0 12px;font-size:24px;color:#111827}.profile p{margin:0 0 24px;max-width:560px;color:#6b7280;line-height:1.6}.profile-form{display:grid;gap:12px}.profile-form label{font-weight:600;color:#374151}.profile-form input{width:100%;padding:12px 14px;border:1px solid #d1d5db;border-radius:12px;outline:none;color:#111827}.profile-form input:focus{border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e526}.profile-form button{justify-self:start;margin-top:8px;padding:12px 18px;border:none;border-radius:12px;background-color:#4f46e5;color:#fff;font-weight:700;cursor:pointer;transition:.2s}.profile-form button:hover{background-color:#4338ca;transform:translateY(-2px)}@media (max-width: 640px){.app-card{padding:24px}.profile-form button{width:100%}}.header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:24px;border-bottom:1px solid #e5e7eb}.header h1{margin:0;font-size:28px;color:#111827}.username-badge{padding:10px 14px;border-radius:999px;background-color:#eef2ff;color:#4f46e5;font-weight:600}.username-badge span{color:#1e1b4b}@media (max-width: 640px){.header{flex-direction:column;text-align:center}}