*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:#f4f7fb;color:#1f2937;font-family:Arial,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}.login-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.login-panel{width:min(420px,100%);background:#ffffff;border:1px solid #e5e7eb;border-radius:8px;box-shadow:0 14px 40px rgba(15,23,42,.08);padding:28px}.login-title{margin:0 0 6px;font-size:24px;font-weight:700}.login-subtitle{margin:0 0 24px;color:#6b7280;font-size:14px}.login-alert{margin-bottom:16px}