body{margin:0 auto;text-align:center;background:#f7f9fc;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}
.brand-bar{background:linear-gradient(90deg,#0e74ff,#5ab1ff);color:#fff;padding:12px 0;margin-bottom:12px}
.brand-bar .container{max-width:980px}
.brand a{color:#fff;text-decoration:none}
.container{max-width:640px;padding:20px;margin:0 auto;background:#fff;border-radius:12px;box-shadow:0 8px 24px rgba(0,0,0,.06)}
.text-muted{color:#4a5b6b}
.nav>li>a{color:#1677ff}
.nav-pills>li.active>a{background-color:#1677ff}
.btn-primary{background-color:#1677ff;border-color:#1677ff}
.btn-primary:hover{background-color:#0b5ed7;border-color:#0b5ed7}
.alert-info{background-color:#e8f3ff;border-color:#b7daff;color:#1f3b5b}
.form-control{border-radius:8px}
.btn-block{border-radius:8px}