body { background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%); min-height: 100vh;
       display: flex; align-items: center; justify-content: center; font-family: 'Segoe UI', system-ui, sans-serif; }
.login-card { background: #fff; border-radius: 16px; box-shadow: 0 20px 60px rgba(0,0,0,.3); width: 100%; max-width: 420px; overflow: hidden; }
.login-header { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: #fff; padding: 28px; text-align: center; }
.login-body { padding: 30px; }
.btn-login { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border: none; padding: 12px; width: 100%; color: #fff; font-weight: 600; }
.btn-login:hover { color: #fff; opacity: .92; }