/* ========== 登录页样式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.login-wrapper {
    width: 400px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 25px 70px rgba(0,0,0,.25);
    overflow: hidden;
}
.login-banner {
    background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
    padding: 36px 40px 24px;
    text-align: center;
}
.login-banner h2 { color: #fff; font-size: 20px; font-weight: 700; margin: 0 0 4px; }
.login-banner p  { color: rgba(255,255,255,.7); font-size: 13px; margin: 0; }
.login-body { padding: 36px 44px 44px; }
.mb-group { margin-bottom: 22px; }
.mb-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #444;
    margin-bottom: 6px;
}
.mb-group .form-control {
    width: 100%;
    padding: 11px 14px;
    font-size: 14px;
    border: 1px solid #dcdfe6;
    border-radius: 6px;
    outline: none;
    transition: border-color .15s, box-shadow .15s;
}
.mb-group .form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102,126,234,.12);
}
.btn-login {
    width: 100%;
    padding: 12px;
    margin-top: 6px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .15s;
    letter-spacing: 2px;
}
.btn-login:hover { opacity: .9; }
.err-msg {
    color: #e74c3c;
    font-size: 13px;
    margin-bottom: 4px;
    text-align: center;
    min-height: 20px;
}
.copyright-bar {
    text-align: center;
    font-size: 12px;
    color: #aaa;
    padding: 0 0 20px;
}