* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, "Microsoft YaHei", sans-serif;
    background: linear-gradient(135deg, #1a3c6e 0%, #2a5c9e 100%);
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
}
.login-container { width: 100%; max-width: 420px; padding: 20px; }
.login-card {
    background: #fff; border-radius: 12px; padding: 40px;
    box-shadow: 0 8px 32px rgba(0,0,0,.15);
}
.login-header { text-align: center; margin-bottom: 32px; }
.login-header h1 {
    font-size: 24px; color: #1a3c6e; font-weight: 700;
    letter-spacing: 2px;
}
.login-header p { font-size: 13px; color: #999; margin-top: 6px; }
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block; font-size: 14px; color: #333;
    margin-bottom: 6px; font-weight: 500;
}
.form-group input {
    width: 100%; padding: 10px 14px; font-size: 14px;
    border: 1px solid #dcdfe6; border-radius: 6px;
    outline: none; transition: border-color .2s;
}
.form-group input:focus { border-color: #1a3c6e; }
.error-msg {
    background: #fef0f0; color: #f56c6c; font-size: 13px;
    padding: 8px 12px; border-radius: 4px; margin-bottom: 16px;
}
.pwd-tip {
    font-size: 13px; color: #e6a23c; line-height: 1.6;
    background: #fdf6ec; padding: 10px 12px;
    border-radius: 4px; margin-bottom: 20px;
}
.login-btn {
    width: 100%; padding: 12px; font-size: 16px;
    background: #1a3c6e; color: #fff; border: none;
    border-radius: 6px; cursor: pointer; font-weight: 500;
    transition: background .2s;
}
.login-btn:hover { background: #2a5c9e; }
.login-btn:disabled { background: #a0b4d6; cursor: not-allowed; }
.login-footer { text-align: center; margin-top: 24px; }
.login-footer p { font-size: 12px; color: #bbb; }