body { background: #1a1a1a; display: flex; justify-content: center; margin: 0; font-family: sans-serif; }
.mobile-wrapper { width: 100%; max-width: 450px; min-height: 100vh; background: #fff; box-shadow: 0 0 20px #000; }
.signup-header { background: #2196f3; color: white; padding: 40px 20px; text-align: center; border-radius: 0 0 40px 40px; }
.form-container { padding: 30px 20px; }
input { width: 100%; padding: 15px; margin-bottom: 15px; border-radius: 10px; border: 1px solid #ddd; box-sizing: border-box; font-size: 16px; }
.reg-btn { width: 100%; padding: 15px; border-radius: 30px; border: none; background: #2196f3; color: white; font-weight: bold; font-size: 18px; cursor: pointer; }
.footer-link { text-align: center; margin-top: 20px; }